ICHEP2012

Australia/Melbourne
Melbourne Convention and Exhibition Centre

Melbourne Convention and Exhibition Centre

Melbourne Australia
Geoffrey Taylor (University of Melbourne (AU)), Raymond Volkas (University of Melbourne)
Description
36th International Conference on High Energy Physics.
    • 15:00 18:00
      ATLAS talk prep Conference Room Level 7 (David Caro, University of Melbourne)

      Conference Room Level 7

      David Caro, University of Melbourne

      closed meeting

    • 15:00 19:30
      Registration
    • 18:00 19:30
      Welcome Reception
    • 22:00 23:30
      CMS Meeting Conference Room, Level 7 (David Caro, University of Melbourne)

      Conference Room, Level 7

      David Caro, University of Melbourne

      closed meeting

    • 09:00 18:00
      TR 12 - Formal Theory Development & TR 1 - The Standard Model Room 218

      Room 218

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        Scattering in Planar N=4 Super-Yang-Mills Theory and the Multi-Regge Limit 20m
        Scattering amplitudes in N=4 Super-Yang-Mills theory are tightly constrained by several general principles: Dual (super)conformal invariance, an operator product expansion for the leading singularity, discrete symmetries, the properties of transcendental functions, and various kinematic limits. Remarkably, these onstraints can be combined to almost completely determine the six-gluon scattering amplitude at three loops, as well as provide important information beyond three loops, without ever directly evaluating any loop integrands or loop integrals. The general constraints work in synergy with those arising in a specific limit --- multi-Regge-kinematics for high-energy scattering --- and shed new light on this limit.
        Speaker: Prof. Lance Dixon (SLAC National Accelerator Laboratory (US))
        Slides
      • 09:20
        Maximal Unitarity at Two Loops 20m
        The unitarity method is a key part of the set of on-shell methods for calculating gauge-theory amplitudes both analytically and numerically. These methods have been used successfully to obtain the one-loop amplitudes needed for a variety of cutting-edge high-multiplicity next-to-leading order calculations for LHC physics. They have been applied both to analytic calculations, and in the framework of numerical codes such as BlackHat. In this talk, I discuss the first steps in extending maximal unitarity to a computation of two loop amplitudes, needed for precision LHC calculations.
        Speaker: Dr David Kosower (CEA - Centre d'Etudes de Saclay (FR))
        Slides
      • 09:40
        Spectrum of a Walking Gauge Theory 20m
        We study the spectrum of vector and scalar mesons in the holographic dual of a walking gauge theory , obtained by embedding D7 - anti-D7 probe branes in a certain type IIB background. We show that there is a nontrivial relation that needs to be satisfied in order for axial-vector modes to exist The scalar mesons arise from fluctuations of the probe flavour branes and complement the (axial-)vector meson spectra. By explicitly finding the spectrum of scalar masses, we show that the nonsupersymmetric D7 - anti-D7 embedding is stable with respect to such fluctuations. Interestingly, it turns out that the mass splitting between the scalar and vector meson spectra is of subleading order in a small parameter expansion. We also estimate the Peskin Takeuchi S parameter of this theory and show that it is positive definite.
        Speaker: Prof. L.C. Rohana Wijewardhana (University of Cincinnati (US))
        Slides
      • 10:00
        Holographic calculation of hadronic contributions to muon g-2 15m
        We have performed a holographic calculation of the hadronic contributions to the anomalous magnetic moment of the muon, using the gauge/gravity duality. We compute the leading order hadronic (HLO) contribution to the anomalous magnetic moment of muon, amu(HLO), and find amu(HLO) =470.5 x 10^{-10} in AdS/QCD with two light flavors, which is compared with the currently revised BABAR data estimated from e^+ e^- -> pi^+ pi^- events, amu(HLO)[pipi]=(514.1 +- 3.8) x 10^{-10}. Calculating the light-by-light contribution, both 5D SU(2) and U(3) flavor gauge symmetries are considered for the neutral pion, eta and eta' contributions to the hadronic corrections. We find the total light-by-light contributions of pseudo scalars to the muon anomalous magnetic moment, a_mu=10.7 x 10^(-10), which is consistent with previous estimates, based on other approaches.
        Speaker: Dr Doyoun Kim (Monash University (AU))
        Slides
      • 10:15
        Strong field effects on physics processes at the Interaction Point of future linear colliders 15m
        Future linear colliders will be precision machines which, among other things, will closely study the Higgs sector, provide tighter bounds on electroweak observables and look for new physics via polarised beams. The luminosity requirements of such machines entail very intense lepton bunches at the IP with associated strong electromagnetic fields. These strong fields not only lead to obvious phenomena such as beamstrahlung, ISR and FSR, but also affect every particle physics process via virtual exchange with the bunch fields. For precision studies, strong field effects have to be understood to the sub-percent level. Strong external field effects can be taken into account exactly via the Furry interaction Picture. Within this picture, significant theoretical and phenomenlogical development is in progress and here we summarise the current state of play, presenting new exact solutions for overlapping relativistic charge bunch fields, cross-sections calculations for generic two vertex Furry picture processes, and the generation of processes via a new software package - IPstrong.
        Speaker: Dr Anthony Hartin (DESY (DE))
        Slides
      • 10:30
        Refreshment Break 30m
      • 11:00
        IR-Improved Operator Product Expansions in non-Abelian Gauge Theory 15m
        We present a formulation of the operator product expansion that is infrared finite to all orders in the attendant massless non-Abelian gauge theory coupling constant, which we will often-times associate with the QCD theory, the theory that we actually have as our primary objective in view of the operation of the LHC at CERN. We make contact in this way with the recently introduced IR-improved DGLAP-CS theory and point-out phenomenological implications accordingly, with an eye toward the precision QCD theory for LHC physics.
        Speaker: Prof. Bennie Ward (Baylor University (US))
        Slides
      • 11:15
        Radiation from accelerated charges at strong coupling 15m
        We present our latest results concerning the radiation spectrum emitted by a relativistic charged particle at strong coupling, employing the theoretical techniques provided by the AdS/CFT correspondence. We compare with other recent analyses of this problem with heavy quarks [1,2], and in our case we do find deviations from the (classical) Lienard formula once we take into account all the relevant quantum effects. References: [1] C.Athanasiou, P.M.Chesler, H.Liu, D.Nickel and K.Rajagopal, ``Synchrotron radiation in strongly coupled conformal field theories,'' Phys. Rev. D81, 126001 (2010). [2] Y.Hatta, E.Iancu, A.H.Mueller and D.N.Triantafyllopoulos, ``Aspects of the UV/IR correspondence: energy broadening and string fluctuations,'' JHEP 1102, 065 (2011).
        Speaker: Dr Daniel Fernandez-Fraile (Frankfurt University (DE))
        Slides
      • 11:30
        Near BPS Skyrmions: Non-shell configurations and Coulomb effects 15m
        We propose to describe nuclei as near BPS solitons emerging from a generalization of the Skyrme model in the regime where a sixth-order term and a generalized mass term dominate. The mass term is chosen such that the baryon and energy density generated by the solutions do not exhibit the usual shell configuration. Adding contributions from the rotational energy, Coulomb energy and isospin symmetry breaking, we reproduce the mass of the most abundant isotopes to rather good accuracy.
        Speaker: Prof. Luc Marleau (Université Laval (CA))
        Slides
      • 11:45
        Classical geometry to quantum behavior correspondence in a Virtual Extra Dimension 15m
        In the Lorentz invariant formalism of compact space-time dimensions the assumption of periodic boundary conditions represents a consistent semi-classical quantization condition for relativistic fields. In [arXiv:1110.0315, Ann. Phys. (2012)] we have shown, for instance, that the ordinary Feynman path integral is obtained as interference between the classical paths with different winding numbers associated to the cyclic dynamics of the field solutions. Through the boundary conditions, the kinematical information of interaction is encoded on the relativistic geometrodynamics of the boundary. Furthermore, such a purely four-dimensional theory is manifestly dual to an extra-dimensional field theory. The resulting correspondence between extra-dimensional geometrodynamics and ordinary quantum behavior yields an unconventional interpretation of the AdS/CFT correspondence in terms of wave-particle duality. By applying this approach to a simple Quark-Gluon-Plasma freeze-out model we retrieve basic aspects of AdS/QCD phenomenology.
        Speaker: Dr Donatello Dolce (University of Melbourne (AU))
        Slides
      • 12:00
        Calculating repetitively 15m
        The Antonsen – Bormann idea was originally proposed by these authors for the computation of the heat kernel in curved space; it was also used by the author recently with the same objective but for the Lagrangian density for a real massive scalar field in 2 + 1 dimensional stationary curved space,the metric being defined by the rotating solution of Deser et al. Ann.Phys.120,220(1984) and Clement,Int.J.Theor.Phys.24,267(1985) of the Einstein field equations associated with a single massless spinning particle located at the origin.It is now reworked here with a different purpose – namely, to determine the zeta function for the said model using the Schwinger operator expansion. The repetitive nature of this calculation at all higher orders (≥3) in the gravitational constant G suggests the use of the Dirac delta-function and one of its integral representations – in that it is convenient to obtain answers. The vierbeins presented by the author at FFP10 – arXiv: 1003.0260 [hep-th] – and published in Kamath, AIP Conf.Proc.1246: 174-177, 2010 play a pivotal role in this exercise, with the pair displayed in eq.(12) therein being distinguished for the simplicity of the calculation reported here.
        Speaker: Prof. Gopinath Kamath (Indian Institute of Technology-Madras (IN))
        Slides
      • 12:15
        NLO and NNLO EWC for PV Møller Scattering 15m
        High-precision electroweak experiments such as parity-violating Møller scattering can provide indirect access to physics at multi-TeV scales and play an important complementary role to the LHC research program. However, before physics of interest can be extracted from experimental data, electroweak radiative corrections, which can significantly reduce the cross-section asymmetry, must be calculated with an unprecedented completeness and accuracy. Although the two-loop corrections are strongly suppressed relative to the one-loop corrections, they can no longer be dismissed. We evaluate a full gauge-invariant set of one-loop and several types of the two-loop radiative corrections for the Møller asymmetry by combining two distinct but mutually-reinforcing techniques: semiautomatic, precise, with FeynArts and FormCalc as base languages, and “by hand”, with some approximations. For 11 GeV relevant for the MOLLER experiment planned at JLab, the results obtained by two approaches are in excellent agreement, which gives us assurance that our calculations are error-free. A possible way to incorporate new physics particles into theoretical predictions for the Møller asymmetry is briefly discussed at the end.
        Speaker: Dr Svetlana Barkanova (Acadia University (CA))
        Slides
      • 12:30
        Lunch Break 1h 30m
      • 14:00
        Supersymmetry breaking from monopole condensation 20m
        I will describe models where dynamical supersymmetry breaking is triggered by monopole condensation. Low energy theory is described by O'Rafeartaigh models with spontaneously broken R-symmetry.
        Speaker: Prof. Yuri Shirman (University of California-Irvine (US))
        Slides
      • 14:20
        Higher Spins and Strings 20m
        The formulation of consistent theories involving particles with arbitrary spin represents an old open theoretical challenge. In the massless case the corresponding gauge theories provide far-reaching generalisations of Yang-Mills theory and General Relativity, while massive higher-spin states are known to represent essential ingredients of the spectrum of String Theory. I will describe the basics of higher-spin constructions in flat and (Anti-) de Sitter backgrounds and review some recent progress on the subject, aiming to better frame the question of how to provide a bridge between the massless regime and its possible broken phases.
        Speaker: Dr Dario Francia (Centro E. Fermi and Scuola Normale Superiore (IT))
        Slides
      • 14:40
        An Estimate of Lambda in Resummed Quantum Gravity in the Context of Asymptotic Safety and Planck Scale Cosmology: Constraints on SUSY GUTS 15m
        We use the amplitude-based resummation of Feynman`s formulation of Einstein`s theory to arrive at a UV finite approach to quantum gravity. We show that we recover the UV fixed point recently claimed by the exact field-space renormalization group approach. We use our approach in the context of the attendant Planck scale cosmology formulation of Bonanno and Reuter to estimate the value of the cosmological constant as \rho_\Lambda=(0.0024 ev)^4. We show that the closeness of this estimate to experiment constrains susy GUT models.
        Speaker: Prof. Bennie Ward (Baylor University (US))
        Slides
      • 14:55
        Finite Energy One-half Monopole Solutions of the SU(2) Yang-Mills-Higgs Theory. 15m
        We would like to show the existence of finite energy SU(2) Yang-Mills-Higgs particles of one-half topological charge. The 't Hooft Abelian magnetic fields of these solutions at spatial infinity correspond to the magnetic field of a positive one-half magnetic monopole located at the origin, $r=0$, and a semi-infinite Dirac string singularity located on one half of the $z$-axis which carries a magnetic flux of $\frac{2\pi}{g}$ going into the center of the sphere at infinity. Hence the net magnetic charge of the configuration is zero. The non-Abelian solutions possess gauge potentials that are singular at only one point, that is, on either the positive or the negative $z$-axis at large distances, elsewhere they are regular. There are two distinct different configurations of these particles with different total energies and energy distributions. The total energies of these one-half magnetic monopole solutions are calculated for various strength of the Higgs field self-coupling constant $\lambda$ and they are found to increase logarithmically with $\lambda$. These solutions do not satisfy the first order Bogomol'nyi equations and are non-BPS solutions.
        Speaker: Prof. Rosy Teh (Universiti Sains Malaysia (MY))
        Slides
      • 15:10
        Electric, Magnetic and Spin-Dependent Dynamical Polarizabilities of Hadrons 15m
        Compton scattering offers a unique opportunity to study the dynamical structure of hadrons over a wide kinematic range, with polarizabilities characterizing the hadron’s active internal degrees of freedom. We present calculations and detailed analysis of electric and magnetic and the spin-dependent dynamical polarizabilities for the lowest in mass SU(3) octet of baryons. These extensive calculations are made possible by the recent implementation of semi-automatized calculations in chiral perturbation theory which allows evaluating polarizabilities from Compton scattering up to next-to-the-leading order. The dependences for the range of photon energies covering the majority of the meson photoproduction channels are analyzed.
        Speaker: Dr Aleksandrs Aleksejevs (Memorial University of Newfoundland (CA))
        Slides
      • 15:25
        Refreshment Break 35m
      • 16:00
        NNLL resummation for W-boson production at large pT 15m
        I present new results for W-boson production at large transverse momentum at the LHC and the Tevatron. The contribution of soft-gluon corrections is derived from NNLL resummation and added to the exact NLO result. Numerical results for the approximate NNLO W-boson transverse momentum distributions are derived. The scale and PDF uncertainties are discussed.
        Speaker: Prof. Nikolaos Kidonakis (Kennesaw State University (US))
        Slides
      • 16:15
        Precise measurement of the W boson mass at CDF II 15m
        The mass of the W boson is sensitive to radiative corrections from the top quark and the Higgs boson. We present a new measurement of mW using 2.2/fb of sqrt(s)=1.96 TeV ppbar collision data collected with the CDF II detector. Utilizing 470126 W → eν candidates and 624708 W → μν candidates, we measure mW = 80387±19 MeV. This is the most precise measurement of mW, more precise than all previous measurements of mW combined.
        Speaker: Prof. Ashutosh Kotwal (Duke University (US))
        Slides
      • 16:30
        Measurement of the W boson mass with the D0 detector and combination of the CDF and D0 results for the W boson mass 15m
        We present a measurement of the W boson mass using data corresponding to an integrated luminosity of 4.3 fb-1 collected with the D0 detector during Run 2 at the Fermilab Tevatron ppbar collider. With a sample of 1,677,394 W---> e nu candidate events, we measure M_W = 80.367 +/- 0.026 GeV. This result is combined with an earlier D0 result determined using an independent Run 2 data sample, corresponding to 1 fb-1 of integrated luminosity, to yield M_W=80.375+/-0.023 GeV.We also present the combination of all the Tevatron measurements of the W boson mass, including the results from CDF and from Run I, to obtain the Tevatron average for the mass of the W boson of 80.387 +/- 0.016 GeV and the new world average, including the data from LEP II, M_W=80.385 +/- 0.015 GeV.
        Speaker: Dr Jan Stark (Laboratoire de Physique Subatomique et de Cosmologie)
        Slides
      • 16:45
        Measurement of tau polarization in W-->tau nu decays with the ATLAS detector 15m
        A measurement of tau polarization in W-> tau nu decays is reported with data collected by the ATLAS experiment. It is measured from the energies of the decay products in hadronic tau decays with a single final state charged particle, and it is found in agreement with the Standard Model prediction.
        Speaker: Dr Sarah Marie Demers (Yale University (US))
        Slides
      • 17:00
        Study of tau-pair production at HERA 15m
        A study of events containing two tau leptons with high transverse momentum has been performed with the ZEUS detector at HERA, using a data sample corresponding to an integrated luminosity of 0.33 fb-1. The tau candidates were identified from their decays into electrons, muons or hadronic jets. The number of tau-pair candidates has been compared with the prediction from the Standard Model, where the largest contribution is expected from Bethe-Heitler processes. The total visible cross section was extracted. Standard Model expectations agree well with the measured distributions, also at high invariant mass of the tau pair.
        Speaker: Mr Masaki Ishitsuka (Tokyo Institute of Technology)
        Slides
      • 17:15
        Elastic Z0 production at HERA 15m
        A search for events ep-> ep Z0 has been performed in ep collisions at HERA using the ZEUS detector. The search is based on the entire HERA-I and HERA-II data set, amounting to 0.49 fb-1 of integrated luminosity. The Z0 was searched in the di-jet decay mode with elastic condition defined by etamax < 3, where etamax is defined as the pseudorapidity of the energy deposit in the calorimeter closest to the proton beam direction. A di-jet mass peak is observed at the Z0 mass and the number of signal events is extracted from a fit to the mass spectrum.The elastic Z0 production cross section is determined and compared to the SM prediction.
        Speaker: Dr Katarzyna Wichmann (DESY)
        Slides
      • 17:30
        Onset of deconfinement and search for the critical point of strongly interacting matter at CERN SPS energies 15m
        The exploration of the QCD phase diagram particularly the search for a phase transition from hadronic to partonic degrees of freedom and possibly a critical endpoint, is one of the most challenging tasks in present heavy-ion physics. As observed by the NA49 experiment, several hadronic observables in central Pb+Pb collisions at the CERN SPS show qualitative changes in their energy dependence. These features are not observed in elementary interactions and indicate the onset of a phase transition in the SPS energy range [1,2]. The existence of a critical point is expected to result in the increase of event-by-event fluctuations of various hadronic observables [3,4] provided that the freeze-out of the measured hadrons occurs close to its location in the phase diagram and the evolution of the final hadron phase does not erase the fluctuations signals. A selection of NA49 results on particle multiplicity, transverse momentum, azimuthal angle fluctuations and the proton intermittency from the scan of the phase diagram will be presented and discussed [5,6]. A new technique to study fluctuations of the chemical composition of the hadronic system produced in nuclear collisions, the identity method, will be introduced and its properties will be discussed. Preliminary results from Pb+Pb collisions registered by the NA49 experiment at the CERN SPS will be shown. References: [1] C. Alt et al., Phys. Rev. C 77 (2008) 024903 [2] M. Gazdzicki et al., J. Phys. G 30 (2004) S701 [3] M.A.Stephanov,K.Rajagopal,E.V.Shuryak, Phys.Rev. D 60, 114028 (1999). [4] B.Berdnikov,K.Rajagopal, Phys. Rev. D 61, 105017 (2000). [5] T.Anticic et al., Phys. Rev. C 79, 044904 (2009). [6] C.Alt et al., Phys. Rev. C 78, 034914 (2008).
        Speaker: Maciej Rybczynski (Jan Kochanowski University (PL))
        Slides
      • 17:45
        . 15m
    • 09:00 18:00
      TR 6 - RM 217 - QCD, Jets, Parton Distributions Room 219

      Room 219

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        Measurement and QCD Analysis Deep-Inelastic Scattering at HERA. 15m
        The inclusive e±p single and double differential cross sections for neutral and charged current processes are measured with the H1 detector at HERA. The data were taken at a centre-of-mass energy of √s = 319 GeV with a total integrated luminosity of 329.1 pb−1 shared between two lepton beam charges and two longitudinal lepton polarisation modes. The differential cross sections are measured in the range of four-momentum transfer squared, Q2 , between 120 and 50 000 GeV2 , and Bjorken x between 0.008 and 0.65. The measurements are combined with earlier published H1 data to determine the structure function xF_3^γ Z. A measurement of the neutral current parity violating structure function F_2^γ Z is presented for the first time. The polarisation dependence of the CC total cross section for Q2 > 400 GeV2 is found to be consistent with the Standard Model. The new measurements are well described by a next-to-leading order QCD fit using all published H1 inclusive cross section data which is used to extract flavour separated parton densities. A measurement is presented of the inclusive neutral current e±p scattering cross section using data collected by the H1 experiment at HERA during the years 2003 to 2007 with proton beam energies Ep of 920, 575, and 460 GeV. The kinematic range of the measurement covers low absolute four-momentum transfers squared, 1.5 GeV2 < Q2 < 120 GeV2, small values of Bjorken x, 2.9 • 10−5 < x < 0.01, and extends to high inelasticity up to y = 0.85. The structure function FL is measured by combining the new results with previously published H1 data at Ep = 920 GeV and Ep = 820 GeV. The new measurements are used to test several phenomenological and QCD models applicable in this low Q2 and low x kinematic domain. A precise knowledge of the integrated luminosity of the HERA collider is relevant for various types of cross section measurements and for a precise determination of the parton density functions of the proton. At ep colliders, the integrated luminosity is often measured in the Bethe Heitler process, using dedicated detectors located at small angles. In this paper, an alternative measurement of the integrated luminosity is presented, exploiting the elastic QED Compton process ep -> e gamma p. Both the electron and the photon are detected in the H1 backward calorimeter. The integrated luminosity of the data recorded in 2003 to 2007 is determined with a relative precision of +-0.85%(stat) +-2.12%(sys), where (stat) is the statistical uncertainty and (sys) is the total systematic uncertainty. The measurement is found to be compatible with the corresponding Bethe-Heitler analysis.
        Speaker: Mr Zhiqing Philippe Zhang (Laboratoire de l'Accélérateur Linéaire (FR))
        Slides
      • 09:15
        High Q2 Neutral Current new results from ZEUS 15m
        The cross sections for neutral current deep inelastic scattering in e+p collisions with a longitudinally polarised positron beam have been measured using the ZEUS detector at HERA. The single-differential cross-sections dsigma/dQ2, dsigma/dx and dsigma/dy and the double-differential cross sections in Q2 and x are measured in the kinematic region Q2 > 185 GeV2 for both positively and negatively polarised electron beams and for each polarisation state separately. The measurements are based on an integrated luminosity of 136 pb-1 taken in 2006 and 2007 at a centre-of-mass energy of 318 GeV. The structure functions xF_3 and xF_3^{\gammaZ} are determined by combining the e+p results presented in this analysis with previously measured e-p neutral current data. The measured cross sections are compared to the predictions.
        Slides
      • 09:30
        HERAPDF 15m
        A preliminary global NLO QCD analysis of the HERA data is presented. The following data sets are used in this analysis: the NC and CC inclusive DIS cross sections obtained from the combination of the measurements from H1 and ZEUS based on HERA I and HERA II data at the nominal proton beam energy, the preliminary combined inclusive NC DIS cross sections at reduced proton beam energies, the inclusive jet cross sections from H1 and ZEUS and the preliminary combined HERA results on the structure function F2(charm). A NLO QCD PDF fit analysis with simultaneous determination of the strong coupling constant $\alpha_s(M_Z)$ is presented. The analysis is based on the same combined H1 and ZEUS inclusive DIS measurements as HERAPDF1.5 fit, together with jet measurements provided by both H1 and ZEUS collaborations. The inclusion of jet data in the analysis significantly reduces the correlation etween the gluon parton density function and the strong coupling, improving the precision of the gluon PDF and providing an accurate determination of $\alpha_s(m_Z)$. The PDF set HERAPDF1.5 represents the QCD analysis of the combined HERA I including the preliminary combination of the HERA II data. Such, higher precision at high Q2 and high x is achieved. The precision of the PDFs at high x is significantly improved, particularly in the valence sector. The results of the NNLO fit variant are presented: the PDFs and their uncertainties. The fit was performed with 14 free PDF parameters. There are also comparisons to the previous HERAPDF1.0 NNLO PDF, based on HERA I data only, and to the new HERAPDF1.5f, which is a NLO version with also 14 free parameters in the fit. A next-to-leading order QCD analysis is performed based on the preliminary combination of the H1 and ZEUS F2c measurements together with the published HERA inclusive neutral and charged current cross sections. Different variable flavour number schemes were used for the heavy flavour treatment. The fits are used to estimate the optimal value of the charm quark mass parameter mc^model within a given heavy flavour scheme. Depending on the scheme, the optimal values of mc^model range between 1.26 GeV and 1.68 GeV, and are determined with a precision of 0.04 GeV including statistical, model and parameterisation uncertainties.The parton distribution functions determined using the above heavy quark schemes at their optimal values of mc^model are further used to predict the W± and Z production cross sections at the LHC. Good agreement between these predictions for the W± and Z cross sections is observed which allows to reduce the uncertainty due to the heavy flavour treatment, to below 1.0%.
        Speaker: Dr Ringaile Placakyte (DESY (DE))
        Slides
      • 09:45
        Momentum space dipole amplitude for DIS and inclusive hadron production 15m
        We show how the AGBS model, originally developed for deep inelastic scattering applied to HERA data on the proton structure function, can also describe the RHIC data on single inclusive hadron yield for $d+Au$ and $p+p$ collisions through a new simultaneous fit. The single inclusive hadron production is modeled through the color glass condensate, which uses the quark(and gluon)--condensate amplitudes in momentum space. The AGBS model is also a momentum space model based on the asymptotic solutions of the BK equation, although a different definition of the Fourier transform is used. This description entirely in transverse momentum of both processes arises for the first time. The small difference between the simultaneous fit and the one for HERA data alone suggests that the AGBS model describes very well both kind of processes and thus emerges as a good tool to investigate the inclusive hadron production data. We use this model for predictions at LHC energies, which agree quite well with available experimental data.
        Speaker: Prof. M. Beatriz Gay Ducati (Universidade Federal do Rio Grande do Sul (BR))
        Slides
      • 10:00
        New results on the 3-loop Heavy Flavor Wilson Coefficients in Deep-Inelastic Scattering 15m
        We report on recent results obtained for the 3-loop heavy flavor Wilson coefficients in deep-inelastic scattering at general values of the Mellin variable N at large scales of Q^2. These concern contributions to the gluonic ladder-topologies, the transition matrix elements in the variable flavor scheme, and first results on higher topologies. The knowledge of the heavy flavor Wilson coefficients in 3-loop order is of importance to carry out complete NNLO QCD analyses of the world precision data on the structure function F_2(x,Q^2).
        Speaker: Dr Abilio De Freitas (DESY Zeuthen (DE))
        Slides
      • 10:15
        Partons, QCD and Low x Physics at the Large Hadron electron Collider (LHeC Study Group) 15m
        The Large Hadron electron Collider (LHeC) is a proposed facility which will exploit the new world of energy and intensity offered by the LHC through collisions with a new 60 GeV electron beam. This contribution summarises the detailed simulation studies on QCD-related topics included in the recently released Conceptual Design Report. Highlights include a new level of precision and flavour decomposition for the extraction of parton densities and a much extended kinematic range towards low Bjorken-x in which novel saturation effects are expected. In addition to inclusive neutral and charged current cross sections, more exclusive processes such as jet and heavy flavour production are included, as well as diffractive observables.
        Speaker: Prof. Claudia Beatriz Glasman Kuguel (Universidad Autonoma de Madrid (ES))
        Slides
      • 10:30
        Refreshment Break 30m
      • 11:00
        Measurements of differential cross sections for W+jets and for multijet production and determination of the strong coupling constant in ppbar collisions at sqrt(s)=1.96 TeV 15m
        We present two sets of measurements based on data collected with the D0 detector at the Fermilab Tevatron collider running at sqrt(s)=1.96 TeV. First we present a comprehensive study of the differential cross sections for the production of W bosons in association with up to four hadronic jets. Results are compared with the latest NLO and resummation theoretical predictions as well as with models implemented in event generators. We then present measurements of differential cross sections sensitive to multijet production, which are then interpreted in the framework of QCD to determine the evolution of the strong coupling constant in the energy range between 200 and 450 GeV, which has not been investigate yet in these type of studies.
        Speaker: Prof. Michael Strauss (University of Oklahoma (US))
        Slides
      • 11:15
        Z+Jets results from CDF 15m
        Inclusive Z boson plus jets cross sections, as well as bottom jet production in association with a Z-boson cross sections, are measured in a final state where the Z boson has decayed in two muons or electrons. Results are based on the full data sample collected with the CDF detector in Run II, corresponding to $\sim 9.4$ fb$ ^{-1}$ of $\rm p\bar{p}$ collisions at $\rm \sqrt{s}$ = 1.96 TeV. Differential cross sections are measured as a function of several variables, among which jet transverse momentum, jet rapidity and jets multiplicity. Measurements are compared to results from different next-to-leading order perturbative QCD predictions and event generators.
        Speaker: Dr Konstantinos Vellidis (Fermi National Accelerator Laboratory (US))
        Slides
      • 11:30
        Measurements with electroweak gauge bosons at LHCb 15m
        We report the results of several analyses based on the reconstruction of electroweak gauge bosons at LHCb. The forward coverage of the LHCb detector provides unique sensitivity to various different observables that can be used to test the Standard Model predictions. The results include those on W and Z production, Z production with associated jets, and low-mass Drell-Yan production.
        Speaker: Dr Jonathan Anderson (Universität Zürich (CH))
        Slides
      • 11:45
        ATLAS measurements of jets and heavy flavour produced in association with W and Z bosons 15m
        The production of jets and/or heavy flavours in association with a W or Z boson represents an important process with which to study QCD in a multi-scale environment. Unprecedented precision is achieved in measurements of differential cross sections and multiplicities, and comparisons are made to state-of-the-art high NLO QCD calculations of high-multiplicity final states. Jets containing b- or c-hadrons are also identified, and correlations are studied.
        Speaker: Prof. Pierre-Hugues Beauchemin (Tufts University (US))
        Slides
      • 12:00
        Jet production in association with vector bosons 15m
        The associated production of jets and vector bosons allows for stringent tests of perturbative QCD calculations and is sensitive to the possible presence of new physics beyond the Standard Model. A measurement of jet production rates in association with W and Z bosons, or photons, in proton-proton collisions at a 7 TeV center-of-mass energy is presented, using data collected with the CMS detector. The measured jet multiplicity distributions corrected for efficiency and unfolded for detector effects are compared with theoretical predictions. Results for the W charge asymmetry as a function of the number of jets and a test of Berends–Giele scaling are also presented.
        Speaker: Dr Piergiulio Lenzi (CERN)
        Slides
      • 12:15
        QCD studies with W and Z cross sections measured in ATLAS 15m
        Precise measurements of W and Z production, differential in pT and rapidity, are shown. These provide stringent tests of higher order QCD, resummed calculations and non-perturbative models. They are also used to extract information on the strange quark content of the proton.
        Speaker: Dr Maarten Boonekamp (CEA - Centre d'Etudes de Saclay (FR))
        Slides
      • 12:30
        Lunch Break 1h 30m
      • 14:00
        Jet Physics at HERA 15m
        Isolated-photon+jet production in ep collisions at a centre-of-mass energy of 318 GeV has been measured with the ZEUS detector at HERA using an integrated luminosity of up to 300 pb-1. Measurements of prompt-photon+jet cross sections are presented as functions of the photon transverse energy and pseudorapidity in a wide range of exchanged-photon virtuality. In addition, differential gamma+jet cross sections are presented as functions of the jet transverse energy and pseudorapidity. Leading-logarithm parton-shower Monte Carlo predictions and perturbative QCD calculations were compared to the data. Differential inclusive-jet cross sections have been measured in photoproduction for boson virtualities Q2 < 1 GeV2 with the ZEUS detector at HERA using an integrated luminosity of 300 pb-1. Jets were identified in the laboratory using the kt cluster algorithm in the longitudinally inclusive mode. Cross sections are presented as functions of the jet pseudorapidity, etajet, and the jet transverse energy, Etjet. In addition, measurements of double-differential inclusive-jet cross sections are presented as functions of Etjet in different regions of etajet. These cross sections have the potential to constrain the gluon density in the proton and the photon when included as input to fits to extract the proton parton distribution functions. Next-to-leading-order QCD calculations give a good description of the measurements. A value of alphas(Mz) has been extracted from the measurements. The energy-scale dependence of the coupling has also been determined. Signals of QCD instanton-induced processes are searched for in deep-inelastic scattering (DIS) at the electron-proton collider HERA in the kinematic region defined by the Bjorken-scaling variable x > 10^{-3}, the inelasticity 0.2< y < 0.7 and the photon virtuality 150 < Q^2 < 15000 GeV^2. The search is performed using H1 data corresponding to an integrated luminosity of ~350 pb^{-1}. Several observables of the hadronic final state of the events are exploited to identify a potentially instanton-enriched domain. Two Monte Carlo models, RAPGAP and ARIADNE, are used to estimate the background from the standard DIS processes, and the instanton-induced scattering processes are modeled by the program QCDINS. In order to extract the expected signal a multivariate data analysis technique is used. New results on normalised inclusive jet, di-jet and trijet differential cross sections in neutral current deep-inelastic ep scattering (DIS) based on a regularised unfolding procedure are presented. Detector effects like acceptance and migrations as well as statistical correlations between the multi-jets and the inclusive DIS events are taken into account in this procedure. The DIS phase space of this measurement with the H1 detector is given by the virtuality of the exchanged boson (gamma*,Z^0) 150 < Q^2 < 15000 GeV^2 and the inelasticity of the interaction 0.2 < y < 0.7. The jets are reconstructed in the Breit frame of reference using the k_t jet algorithm. In all cases the jet pseudorapidities in the laboratory frame are required to be in the range -1.0 < eta_lab < 2.5. For inclusive jets the transverse momenta in the Breit frame are 7 < P_T < 50 GeV. The di-jet and tri-jet phase space are defined by requiring 5 < P_T,i < 50 GeV, and the invariant mass of the two leading jets M_1,2 > 16 GeV. Compared to a previously published result on normalised multi-jet cross sections, the new features are an extended range in jet pseudorapidity, an improved hadronic energy scale uncertainty of 1% and the adoption of a regularised unfolding procedure. The unfolded normalised jet cross sections are compared to QCD calculations at NLO and values for the strong coupling alpha_s(M_Z) are extracted.
        Slides
      • 14:15
        Transverse Energy Energy Correlations in Next-to-Leading Order in alpha_s at the LHC 15m
        We compute the transverse energy-energy correlation (EEC) and its asymmetry (AEEC) in next-to-leading order (NLO) in $\alpha_s$ in proton-proton collisions at the LHC with the center-of-mass energy $E_{\rm c.m.}=7$ TeV. We show that the transverse EEC and the AEEC distributions are insensitive to the factorization- and renormalization scales, the underlying minimum bias events, and the structure functions. Hence they can be used to precisely test QCD in hadron colliders and determine $\alpha_s$. We illustrate this technique by defining jets using the anti-$k_T$ jet algorithm and an event selection procedure typically used in the analysis of jets at the LHC and show the $\alpha_s$-dependence of the transverse EEC and the AEEC in the range $0.11 \leq \alpha_s(M_Z) \leq 0.13$.
        Speaker: Prof. Ahmed Ali (DESY (DE))
        Slides
      • 14:30
        ATLAS jet measurements, and subjet structure for boosted hadronic objects 15m
        Comprehensive jet cross section measurements are presented, spanning the dijet mass range from 70 GeV to 5 TeV. In addition, event shapes constructed from jets are measured, as well as measurements of jets containing charm and beauty hadrons. These measurements constitute precision tests of QCD in a new energy regime, and show sensitivity to the parton densities in the proton and to the value of the strong coupling, alpha_s. The internal structure of jets is important at the LHC both as a test of perturbative QCD and as a tool for identifying boosted electroweak-scale objects decaying to hadrons. Detailed measurements of jet fragmentation, of subjet variables, single jet masses and jet shapes are presented and compared to the predictions of QCD.
        Speaker: Mr Bertrand Chapleau (McGill University (CA))
        Slides
      • 14:45
        Jet Measurements in CMS 15m
        We present studies of the substructure in multijet and V+jets events at CMS. Several jet grooming techniques are investigated, and We present measurements of jet properties and jet production rates at CMS with pp collisions at 7 TeV. Inclusive jet and dijet differential cross sections are compared to NLO QCD predictions with various PDF sets. We also present studies of the jet substructure in QCD multijet and V+jets events. Several jet grooming techniques are investigated, and predictions from MC generators are compared to collision data .
        Speaker: Mr Sanmay Ganguly (Tata Institute of Fundamental Research)
        Slides
      • 15:00
        Particle production in DIS at HERA 15m
        Scaled momentum distributions for the strange hadrons K0s and Lambda/Lambdabar were measured in deep inelastic ep scattering with the ZEUS detector at HERA using an integrated luminosity of 330 pb-1. The evolution of these distributions with the photon virtuality, Q2, was studied in the kinematic region 10 < Q2 < 40000 GeV2 and 0.001 < x < 0.75, where x is the Bjorken scaling variable. Clear scaling violations are observed. Predictions based on different approaches to fragmentation were compared to the measurements. Tuned leading-logarithm parton-shower Monte Carlo calculations interfaced to the Lund string fragmentation model describe the data reasonably well in the whole range measured. Next-to-leading-order QCD calculations based on fragmentation functions, FFs, extracted from e+e- data alone,fail to describe the measurements. The calculations based on FFs extracted from a global analysis including e+e-, ep and p$ data give an improved description. The measurements presented in this paper have the potential to further constrain the FFs of quarks, anti-quarks and gluons yielding K0s and Lambda/Lambdabar strange hadrons. The production of neutral strange particles is studied at low Q2, using deep-inelastic scattering events recorded with the H1 Detector at HERA. The production cross sections are presented differentially as a function of several kinematical variables in the laboratory and the Breit frame. Moreover, the strangeness production rate is compared to the equivalent rate of charged particles in a similar phase space. The H1 data are compared to theoretical predictions, based on leading order Monte Carlo programs with matched parton showers, with different values of the strangeness suppression factor. The electron-proton collider HERA allows deep-inelastic scattering (DIS) at very small Bjorken-x of about 10^-5. At such small x new parton dynamics beyond DGLAP are expected to become important. Charged particle spectra are measured in DIS (Q^2 > 5 GeV^2), in different regions of pseudorapidity, using the increased statistics of HERA-2. The measurements are compared to simulations based on different Monte Carlo generators. It is shown that the region of small transverse momenta is primarily sensitive to hadronisation, whereas the region of large transverse momenta is mainly driven by perturbative parton radiation. The observed hardness of the transverse momentum spectra, when compared to different model predictions, can be interpreted as supporting the idea of parton dynamics beyond DGLAP. The production of photons at very small angles with respect to the proton beam direction is studied in deep-inelastic positron-proton scattering at HERA. The data are taken with the H1 detector in the years 2006 and 2007 and correspond to an integrated luminosity of 126 pb−1. The analysis covers the range of negative four momentum transfer squared at the positron vertex 6 < Q2 < 100 GeV2 and inelasticity 0.05 < y < 0.6. Cross sections are measured for the most energetic photon with pseudorapidity η > 7.9 as a function of its transverse momentum p_T^lead and longitudinal momentum fraction of the incoming proton x_L^lead. In addition, the cross sections are studied as a function of the sum of the longitudinal momentum fraction x_L^sum of all photons in the pseudorapidity range η > 7.9. The cross sections are normalised to the inclusive deep-inelastic scattering cross section and compared to the predictions of models of deep-inelastic scattering and models of the hadronic interactions of high energy cosmic rays.
        Speaker: Dr Anastasia Grebenyuk (DESY (DE))
        Slides
      • 15:15
        The Energy Dependence of the Underlying Event in Hadron-Hadron Collisions 15m
        We study the behavior of the underlying event in proton-antiproton collisions at 300 GeV, 900 GeV, and 1.96 TeV using charged particles measured by the CDF detector. The charged particle density and the scalar PTsum density in the transverse region as defined by the leading charged particle, PTmax, are examined as a function of PTmax at the three center-of-mass energies. The data at 300 GeV and 900 GeV were taken just before the shutdown of the Tevatron. The 900 GeV results are compared directly with similar studies at the LHC and combining Tevatron and LHC results allows for a mapping out of the energy dependence of the underlying event at 300 GeV, 900 GeV, 1.96 TeV, and 7 TeV. We also examine the ability of the QCD Monte-Carlo models to simultaneously describe the behavior of the underlying event at all four center-of-mass energies.
        Speaker: Prof. Richard Dryden Field (University of Florida (US))
        Slides
      • 15:30
        Refreshment Break 30m
      • 16:00
        Multi-jet matching of parton showers to NLO 15m
        LHC is now entering a precision era. No striking signals of new phenomena have yet been found, and the searches now have to focus on very small deviations from the Standard Model. This requires an unprecedented precision in our understanding of the Standard Model. Even though the experiments are extremely ingenious in finding model-independent ways of determining the background, this is not always possible and they have to rely event generators. And even if model-independent determinations are possible, they typically need precise event generators to be developed and understood. During the last years, much effort has gone into increasing the precision of event generators by carefully matching or merging parton shower programs with exact fixed-order matrix elements. The merging of tree-level matrix elements has now become the standard for multi-jet events, but this leading order procedures lacks in precision. For many processes the matching of Next-to-Leading Order (NLO) matrix elements with parton showers has become state-of-the-art, but the standard programs can only handle the lowest possible jet-multiplicities. In this talk I will briefly review the standard matching and merging procedures, and then present a new algorithm where multi-jet NLO matrix elements can be correctly merged with parton showers. The new algorithm has been implemented in the Pythia8 event generator and will in principle be able to handle any process where multi-jet partonic states can be produced to NLO, however, in this talk I will only present results for W+jets and Higgs+jets observables.
        Speaker: Prof. Leif Ingvar Lönnblad (Lund University (SE))
        Slides
      • 16:15
        NLO Vector+Jets Predictions with BlackHat & Sherpa 15m
        Calculations to next-to-leading order in QCD of Standard-Model processes provide the leading quantitatively reliable predictions. They are a prerequisite for comparisons to experimental data. The BlackHat collaboration has been pushing the high-multiplicity frontier in such calculations. In this talk, representing the BlackHat collaboration, I present the next-to-leading predictions for W and Z production in association with three and four jets at the LHC, results for W production in association with five jets; and results for pure four-jet production. I also show comparisons to available Atlas and CMS data.
        Speaker: Dr David Kosower (CEA - Centre d'Etudes de Saclay (FR))
        Slides
      • 16:30
        Interplay of IR-Improved DGLAP-CS Theory and NLO Parton Shower MC Precision 15m
        We present the interplay between the new IR-improved DGLAP-CS theory and the precision of NLO parton shower/ME matched MC`s as it is realized by the new MC Herwiri1.031 in interface to MC@NLO. We discuss phenomenological implications using comparisons with recent LHC data on single heavy gauge boson production.
        Speaker: Prof. Bennie Ward (Baylor University (US))
        Slides
      • 16:45
        MBR Monte Carlo Simulation in PYTHIA8 15m
        We present the MBR (Minimum Bias Rockefeller) Monte Carlo simulation of (anti)proton-proton interactions and its implementation in the PYTHIA8 event generator. We discuss the total, elastic, and total-inelastic cross sections, and three contributions from diffraction dissociation processes that contribute to the latter: single diffraction, double diffraction, and central diffraction or double-Pomeron exchange. The event generation follows a renormalized-Regge-theory model, successfully tested using CDF data. Based on the MBR-enhanced PYTHIA8 simulation, we present cross-section predictions for the LHC and beyond, up to collision energies of 50 TeV.
        Speaker: Dr Robert Ciesielski (Rockefeller University (US))
        Slides
      • 17:00
        A rigorous assessment of intrinsic accuracies and uncertainties of NLO+PS matching methods 15m
        Similarities and differences between the MC@NLO and the POWHEG methods for matching NLO calculations to parton showers are discussed. Particular emphasis is put on their respective formal accuracies. Implementations of both methods in the SHERPA event generator framework are employed to assess their impact on representative observables. Some freedoms in both formulations will be exploited to quantify the uncertainties for different processes of interest. Further, NLO+PS matched results for complex final states, e.g. the production of a W boson in association with up to 3 jets or a Higgs boson with up to 1 jets will be presented.
        Speaker: Dr Marek Schoenherr (University of Durham (UK))
        Slides
      • 17:15
        NLO Assistance to LHC Searches with Complex Final States using BlackHat and Sherpa 15m
        The prediction of backgrounds to new physics signals in topologies with large missing transverse energy and jets is important to new physics searches at the LHC. The BlackHat collaboration has investigated theoretical issues in extrapolating backgrounds from experimental control regions to signal regions. For example, we compute, ratios of gamma + n-jet to Z + n-jet production rates and kinematic distributions in NLO QCD, and compare with a parton shower matched to leading-order matrix elements. These predictions validate uncertainty estimates used by CMS for the irreducible Z + n-jet component of MET+jets searches. We also describe the phenomenon of left-handed W polarization at large transverse momentum, its theoretical prediction and recent measurement by CMS and ATLAS, and its potential role in background separation.
        Speaker: Prof. Lance Dixon (SLAC National Accelerator Laboratory (US))
      • 17:30
        . 30m
    • 09:00 18:00
      TR 8 - Neutrinos RM 219 Room 217

      Room 217

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        Status and plans with the GERDA experiment to probe the nature of neutrinos 15m
        Neutrinoless double-beta decay (DBD) could answer the key question regarding the Majorana or Dirac nature of neutrinos and give an answer to the unknown absolute mass scale as well as on the neutrino mass hierarchy. High-Purity Germanium (HPGe) detectors are extremely sensitive tools for the search of neutrinoless DBD. This is demonstrated by the GERDA (GERmanium Detector Array) experiment that is currently searching for the DBD of Ge-76 at the Gran Sasso underground Laboratory of INFN, Italy. In its first phase it will scrutinize the claim of observation of neutrinoless DBD in Ge-76 made by a part of the Heidelberg-Moscow Collaboration. The GERDA experiment is designed to minimize the background by operating HPGe detectors directly immersed in ultra-pure cryogenic liquid. The GERDA physics run started in November 2011 using about 15 kg HPGe detectors isotopically enriched in Ge-76. The status of the data taking and the most relevant results will be presented. The spectrum of the neutrino-accompanied DBD of Ge-76 has been observed with unprecedented signal-to-background ratio. A new measurement of the half-life of the neutrino-accompanied DBD of Ge-76 will be given. For the second phase of GERDA additional ~20 kg of Broad Energy Germanium (BEGe) detectors with favorable properties for improved background recognition are being produced from material enriched in Ge-76. First BEGe detectors with superior energy resolution (1.7 keV at 1.3 MeV)have already been produced and have been characterized. The status of the preparations and further plans for GERDA phase II data taking will be presented.
        Speaker: Dr Bela Majorovits (Max-Planck-Institut für Physik (DE))
        Slides
      • 09:15
        Status of the Cuore experiment at Gran Sasso 15m
        Cuore (Cryogenic Underground Observatory for Rare Events) is a second generation neutrino-less double beta decay experiment whose sensitivity is expected to be in the range of 41-95 meV for the electron neutrino effective mass. In Cuore the decay of 9.6 10**26 Te-130 nuclei (206 kg) is observed by means of 988 TeO2 crystals acting as bolometers at very low temperature (~10 mK). The experiment is located at the Laboratori Nazionali del Gran Sasso in Italy and is now approaching the final stage of construction. Most of the crystals have been produced, and the final test of the Cuore assembly line (so called Cuore-0 test) is expected to be up and running by June 2012. If successful, the construction of the full Cuore detector will begin in summer 2012 and is expected to finish by 2014. The talk will summarize the physics reach of the experiment, the status of the construction, and the expected sensitivity.
        Speaker: Dr Sergio Di Domizio (University of Genoa & INFN (IT))
        Slides
      • 09:30
        Search for Neutrinoless Double Beta Decay in Xenon 136 with the Enriched Xenon Observatory (EXO) 15m
        The EXO collaboration is searching for neutrinoless double beta decay in 136Xe. Observation of this process would establish the Majorana nature of neutrinos and lepton number violation, while determining an absolute mass scale for neutrinos. The EXO-200 detector is a ultra low background TPC, with an active mass of ~100 kg of liquid xenon enriched to 80.6% in the isotope 136. The detector is currently operating at the underground WIPP site in New Mexico, USA and has been collecting data since May 2011. The collaboration has previously reported the first observation of two-neutrino double beta decay in 136Xe. In our new data, no signal is observed for an exposure of 32.5 kg-yr, with a background of ∼1.5 × 10−3 kg−1 yr−1 keV−1 in the ±1 sigma region of interest. This sets a lower limit on the half-life of the neutrinoless double-beta decay T1/2(136Xe) > 1.6 × 1025 yr (90% CL), corresponding to effective Majorana masses of less than 140–380 meV, depending on the matrix element calculation. Current R&D efforts towards a ton-scale experiment will also be discussed.
        Speaker: Dr Peter C. Rowson (SLAC (US))
        Slides
      • 09:45
        Latest results from the NEMO-3 experiment and status of SuperNEMO 15m
        The NEMO-3 experiment, designed to search for neutrinoless double beta decay, was carried out from 2003 to 2011 in the Modane Underground Laboratory in the Frejus Tunnel. The detector employed thin isotopic foils surrounded by a drift chamber and scintillator blocks to reconstruct topology, energy, and timing features of nuclear decays. This multi-observable technique offers a powerful means not only to identify double beta decays but also to reject background events mostly due to natural radioactivity. NEMO-3 employed seven different isotopes to construct foils, with most notable mass of Mo-100 of 6.9kg and Se-82 of 0.93kg. Data from the entire running period are currently being analyzed but NEMO-3 has already achieved the best-to-date results on half-lives of all seven isotopes and has reported lower limits on neutrinoless double beta half-lives which can be translated to the most stringent upper limit on the effective neutrino mass. The next generation experiment, SuperNEMO, will employ the technique pioneered by NEMO-3 but will ultimately house about 100kg of an isotopic source distributed in 20 detector modules. SuperNEMO's goal is to reach half-life sensitivity of about 10^26 years and thus about 50meV for an upper limit for the effective neutrino mass. The collaboration has conducted an extensive R&D program to improve detector performance and lower backgrounds in the new detector and the construction of the first "demonstrator" module has commenced. The module will be commissioned in 2014 and remaining modules will be built later in the decade. The baseline choice for an isotope is Se-82 but this technique has flexibility to use any other source. The collaboration also considers Ca-48 and Nd-150 if sufficient amounts of these isotopes can be enriched, currently viewed as an extremely challenging task of its own.
        Speaker: Prof. Karol Lang (University of Texas at Austin (US))
        Slides
      • 10:00
        Results from KamLAND-Zen double-beta decay experiment with 136Xe 15m
        KamLAND-Zen is an experiment for neutrino-less double-beta decay search with 136Xe. A newly constructed balloon was installed inside the current 13m diameter KamLAND balloon and filled with 136Xe loaded liquid scintillator in 2011. The data taking was started in October 2011 and the first physics results were obtained with an exposure of 77.6 days with 129 kg of 136Xe. We measured the two neutrino beta-decay half-life of 136Xe, T1/2(2nu)=2.38 ± 0.02(stat)±0.14(syst)×10^21 yr and obtained an improved lower limit for the neutrino-less double-beta decay half-life, T1/2(0nu) > 5.7×10^24 yr at 90% confidence level.
        Speaker: Dr Satoru Yamada (Tohoku University (JP))
        Slides
      • 10:15
        The KATRIN neutrino mass experiment 15m
        The KATRIN experiment aims at a direct and model independent determination of the neutrino mass with 200 meV sensitivity (90% C.L.) via a measurement of the endpoint region of the tritium beta-decay spectrum. The main components of the experiment are a windowless gaseous tritium source (WGTS), differential and cryogenic pumping sections and a tandem of a pre- and a main-spectrometer, applying the concept of magnetic adiabatic collimation with an electrostatic retardation potential to analyze the energy of beta decay electrons and to guide electrons passing the filter onto a segmented silicon PIN detector. At present the experiment is being installed at the Karlsruhe Institute of Technology and many components are undergoing extensive testing. In the Tritium Laboratory Karlsruhe the demonstrator of the WGTS has been set up. The differential pumping section DPS2F has been installed and initial tests have been completed. A large range of test experiments and background studies have been performed at the pre-spectrometer. The main spectrometer with its air coil system and inner wire electrode is currently in the process of being closed up for bake-out of the system, after which the commissioning of this major component can take place. The 148 pixel silicon detector, required for spectrometer operation, is in place and currently undergoes a refinement of its readout electronics. The talk will present an overview of the experimental status and give an outlook on the commissioning activities. The project is supported by the german ministry of research and education (BMBF) under contract number 05A11PM2.
        Speaker: Dr Volker Hannen (University of Münster (DE))
        Slides
      • 10:30
        Refreshment Break 30m
      • 11:00
        Double Chooz: new results on the theta_13 mixing angle 15m
        The Double Chooz experiment presented in November 2011 a first indication of reactor electron antineutrino disappearance consistent with neutrino oscillations. The observed deficit in the neutrino rate, along with the distortion of the neutrino energy spectrum, is interpreted as a consequence of the oscillation driven by the mixing angle theta_13. In 2012, a second analysis has been performed by the Double Chooz collaboration after 250 days of data taking confirming the oscillation effect and providing a more accurate best-fit value for the theta_13 angle. A detailed description of the Double Chooz latest results will be given in the talk.
        Speaker: Dr Pau Novella Garijo (CIEMAT (ES))
        Slides
      • 11:15
        First Results of the Daya Bay Reactor Neutrino Experiment 15m
        The neutrino mixing angle θ13 is the gateway of studying CP violation in lepton sectors and determines the trend of future neutrino experiments. The Daya Bay Reactor Neutrino Experiment aims to precisely determine θ13, with the design sensitivity better than 0.01 in sin^22θ13 at the 90% C.L. The experiment takes a near-far relative measurement by comparing the observed electron-antineutrino rates and spectra at various baselines from the reactors. Functionally identical antineutrino detectors are deployed in water pools underground, in order to minimize the systematic errors and to suppress the cosmogenic backgrounds. The experiment started physics data taking on Dec.24, 2011. An overview of the experiment and the results using data up to May.15, 2012 will be presented.
        Speaker: Dr Liangjian Wen (Institute of High Energy Physics (CN))
        Slides
      • 11:30
        MINOS neutrino oscillation results 15m
        The MINOS experiment finished data collection in April this year. We have made precision measurements of the oscillation parameters using both neutrino (10.7e20pot) and anti-neutrino (3.3e20pot) enhanced beams and with atmospheric neutrinos (37.9 kt.y). The atmospheric neutrino sample can also be separated into neutrino and antineutrino samples with the magnetic field in the far detector. Updated results of measurements in the 23-mixing sector and the sub-dominant 13-mixing sector will be presented including combined fits from beam and atmospheric data to the separate neutrino and antineutrino mixing parameters. The MINOS+ experiment (the MINOS detector in the ME NOVA beam) will commence running in April 2013.
        Speaker: Dr Giles Barr (Oxford University (UK))
        Slides
      • 11:45
        Results from T2K 15m
        The Tokai to Kamioka (T2K) experiment is a long baseline neutrino oscillation experiment situated in Japan. A high intensity neutrino beam is produced at the Japan Proton Accelerator Research Complex, in Tokai, Japan. A near detector complex, situated 280 m from the neutrino production target, and the far detector at 295 km, are used to detect the neutrinos from this beam. This talk will present T2K results for the neutrino mixing angles θ_{23}, and θ_{13}, using the data collected up to summer 2012.
        Speaker: Dr Ken Sakashita (KEK (JP))
        Slides
      • 12:00
        Measurement of the muon neutrino flux and inclusive charged-current cross-section at T2K's near detector 15m
        We present the first measurement of the muon neutrino spectrum at the T2K near detector, ND280, using the data collected at the JPARC accelerator facility in Tokai, Japan. ND280 is located 280 meters downstream from the target and 2.5^o off-axis from the direction of the beam. The measured spectrum at ND280 constrains the flux and cross section uncertainties in the T2K oscillation analysis. We select inclusive charged-current (CC) events from muon neutrinos in ND280. These are separated into a charged current quasi elastic (CCQE) enhanced sample and a CC non-QE sample. We then fit the muon spectrum for both samples to extract flux and cross section parameters which are used as inputs into T2K's oscillation analysis. We separately produce a flux-averaged differential inclusive CC cross-section in the 2-dimensional plane of muon momentum and angle. For the cross-section measurement the flux is given by the MC and tuned to data from the NA61 experiment. We present the event selection, detector uncertainties, and final measurement result for both the spectrum measurement and for the cross-section result.
        Speaker: Ms Melody Ravonel (University of Geneva (CH))
        Slides
      • 12:15
        Measurement of NC pi0 production and CC interactions using the ND280 P0D. 15m
        The T2K experiment is a long baseline neutrino oscillation experiment designed for the primary goal of measuring oscillations of muon neutrinos to electron neutrinos, thereby providing an appearance measurement of theta_13. One of the major backgrounds of the electron neutrino appearance measurement is from neutral current muon neutrino interactions where a single neutral pion is produced and the photons from the pi-zero decay mimic the electron neutrino appearance signal. To constrain the uncertainty on this background the T2K near detector facility at 280 meters from the proton beam target was used to measure neutral current pi-zero production by muon neutrinos. Presented is a measurement of the neutral current single pi-zero production cross section using 8.55 times 10^19 protons-on-target (POT) of T2K data. We also report the status of an ongoing analysis to measure charged-current interactions in the P0D in which the momentum of the muon is measured in the downstream TPC.
        Speaker: Dr Glenn Lopez (Stony Brook University (US))
        Slides
      • 12:30
        Neutrino cross section measurements at MINERvA 15m
        MINERvA (Main INjector Experiment for v-A) is a neutrino scattering experiment, employing a fine-grained detector with an eight ton active target region, located in the NuMI high-intensity neutrino beam at the Fermi National Accelerator Laboratory. MINERvA was designed to make precision measurements of low energy neutrino and antinuetrino cross sections on a variety of different materials (plastic scintillator, C, Fe, Pb, He and H2O). The experiment will provide important inputs, both in support of neutrino oscillation searches and as a pure weak probe of the nuclear medium. We present the current status of the analyses of the charge current quasi-elastic scattering in plastic scintillator, for both the neutrinos and antineutrinos. In addition We present the current status of the charge current inclusive analyses in the plastic scintillator and in the nuclear targets of carbon, iron and lead.
        Speaker: Mr Rick Snider (Fermi National Accelerator Laboratory (US))
        Slides
      • 12:45
        Lunch Break 1h 15m
      • 14:00
        Recent Cross Section Measurements from MiniBooNE 15m
        A precise knowledge of the neutrino cross sections at ~1 GeV on nuclear targets is required to determine the remaining neutrino oscillation parameters accurately. Until recently, our knowledge of neutrino interactions was based on measurements from 20-year old bubble chamber experiments on hydrogen and deuterium targets. As a result, the systematic uncertainties due to neutrino cross sections are large. In order to reduce these uncertainties neutrino oscillation experiments had to constrain and measure the cross sections. The MiniBooNE experiment at Fermilab was a short baseline neutrino oscillation experiment designed to confirm or refute the LSND signal. MiniBooNE has collected the largest sample of neutrino and anti-neutrino interactions in the ~1 GeV region. The latest neutrino cross section results from MiniBooNE are presented.
        Speaker: Dr Heather Ray (University of Florida (US))
        Slides
      • 14:15
        Model independent determination of the axial mass parameter in quasielastic neutrino-nucleon scattering 15m
        Quasielastic neutrino-nucleon scattering is a basic signal process for neutrino oscillation studies. At accelerator energies, the corresponding cross section is subject to significant uncertainty due to the poorly constrained axial-vector form factor of the nucleon. A model-independent description of the axial-vector form factor is presented. Data from the MiniBooNE experiment for quasielastic neutrino scattering on carbon are analyzed under the assumption of a definite nuclear model. The value of the axial mass parameter, m_A=0.85^{+0.22}_{-0.07} +/- 0.09 GeV, is found to differ significantly from extractions based on traditional form factor models. Implications for future neutrino scattering and pion electroproduction measurements are discussed.
        Speaker: Prof. Richard Hill (University of Chicago (US))
        Slides
      • 14:30
        The ArgoNeuT and MicroBooNE Experiments at Fermi National Accelerator Laboratory 15m
        Liquid argon time projection chambers provide an extraordinary level of information about the interactions of neutrinos. There are several different efforts ongoing at Fermi National Accelerator Laboratory to develop the liquid argon detector technology and utilize it to study neutrino interactions. Among these are the Argon Neutrino Teststand, or ArgoNeuT, project and the MicroBooNE experiment. ArgoNeuT deployed a relatively small, 170 liter, detector in the NuMI neutrino beamline at Fermilab, and the data collected during that endeavor is now being analyzed and used to measure neutrino interaction cross-sections. MicroBooNE is beginning construction this year of a 100 ton liquid argon detector which will be installed in the Booster neutrino beamline at Fermilab and used to measure a wide variety of cross-sections as well as probing the low-energy excess previously reported by the MiniBooNE experiment. This talk will include discussion of recent results and ongoing analyses from ArgoNeuT, as well as the status of the MicroBooNE experiment and its planned physics program.
        Speaker: Prof. Mitchell Soderberg (Syracuse University (US))
        Slides
      • 14:45
        Short baseline neutrino and anti-neutrino oscillation studies at the CERN-SPS. 15m
        The possibility of mixing between standard active neutrinos and neutrino fields which are singlets under the gauge symmetries of the Standard Model was proposed a long time ago. Recent tensions between world-wide experimental data renewed the possibility of at least a sterile neutrino state to explain the observations. While a huge effort is being devoted to resolve the standard three-neutrino mixing paradigm at present no resolutive experimental setup was carried out or proposed to unambiguosly settle these anomalies. Here we present the proposal for an experimental search for sterile neutrinos with a new CERN-SPS neutrino beam using muon spectrometers and large LAr detectors. To definitively clarify the physics issue the proposed experiment will study oscillations in a muon neutrino/antineutrino beam both in appearance and disappearance modes in the eV2 square mass difference region.
        Speaker: Prof. Maximiliano Sioli (INFN (IT))
        Slides
      • 15:00
        New results of the OPERA long-baseline experiment in the CNGS neutrino beam 15m
        The OPERA neutrino experiment is placed in the CERN Neutrino beam to Gran Sasso (CNGS), 730 km from the beam source at CERN, in the underground Gran Sasso Laboratory. With the aim to measure the neutrino velocity on this baseline with higher accuracy than previous studies using accelerator neutrinos, dedicated upgrades of the CNGS timing system and of the OPERA detector were undertaken, as well as a high precision geodesy campaign to assess the neutrino baseline. With data taken by OPERA from 2009 to 2011, they led to preliminary results in 2011, updated in May 2012. Further verifications and up-to-date results on the neutrino velocity using special short bunch beams will be presented.
        Speaker: Prof. Maximiliano Sioli (INFN (IT))
        Slides
      • 15:30
        LAGUNA-LBNO: a very long baseline neutrino oscillation experiment 15m
        LAGUNA (Large Apparatus for Grand Unification and Neutrino Astrophysics)-LBNO(Long-Baseline Neutrino Oscillation)* is the proposal for a long baseline neutrino oscillation experiment with a new conventional neutrino beam aimed at a next generation deep-underground neutrino observatory composed of a double phase liquid Argon detector and a magnetized iron calorimeter located at the Pyhsalami mine, 2300 km from CERN. The design of experimental apparatus is mainly driven by the successful phase of of R&D and prototyping on small scale setups: i) higher signal efficiency along with high background rejection are attainable with the double phase LAr LEM TPC tracking-calorimeter technology thanks to the three-dimensional mm-scale spatial resolution and the excellent energy resolution capabilities. ii) the detector will be complemented with a magnetized calorimeter for the muon detection in order to improve the reconstruction of events occurring in the LAr target. The Phyasalmi mine, the deepest in Europe (4000 m.w.e.), represents a unique experimental location to observe new rare phenomena, both accelerator and non-accelerator based. An unprecedented rich physics program can be pursued. i) neutrino oscillations can be studied in detail fully exploiting, for the first time, the energy spectrum information of the oscillation probability (L/E method) in appearance and disappearance mode at long baseline. An exposure of 2.25x10^20 protons on target (p.o.t.) from the CERN SPS at 400 GeV would allow for a definitive determination (> 5 sigma C.L.) of the neutrino mass hierarchy for any value of the CP violation phase delta_CP. The CP violation can be instead discovered at 3 sigma, through the L/E method, with a coverage of the 70% of the delta_CP parameter space, providing 1.5x10^21 p.o.t., which is achievable possibly in 10 years of exposure. ii) Grand Unified Theories (GUT) can be investigated with searches for several nucleon decay signatures and with unprecedented sensitivities thanks to the very large detector mass and the extremely clean cosmological background. iii) atmospheric neutrinos, as well as unknown astrophysical neutrinos (e.g. from D.M. annihilation) can be studied for the first time over a wide range of energies and final states iv) the explosion of a galactic Supernova (SN) will be detected with large statistics, in neutrino and antineutrino modes and in all flavors allowing to constrain both the astrophysics of the SN and the neutrino flavor oscillations. Main achievements of the R&D phase will be illustrated along with the future plan. The status of the LAGUNA-LBNO project proposal will be discussed along with the possible realization schedules. It will be highlighted the physics reach of a CERN-Pyhasalmi long baseline conventional beam coupled to one or more experiment(s), based on an incremental approach, initially starting from the existing CERN SPS performance and far detector(s) with mass ranges in the 20 kton-scale, and gradually increasing the far detector masses and/or the SPS beam power. * European Commission Framework Programme 7 Design Study LAGUNA (Project Number 212343).
        Speaker: Dr Silvestro Di Luise (ETH-Zurich Institute for Particle Physics (CH))
        Slides
      • 15:45
        Refreshment Break 15m
      • 16:00
        The search for CP violation and the determination of the neutrino mass hierarchy in NOnuA and LBNE 15m
        With the recent discovery of a non-zero value of the neutrino mixing angle $\theta_{13}$, the NuMI Off-Axis $\nu_e$ Appearance (NO$\nu$A) long baseline neutrino oscillation experiment, currently under construction, has unique sensitivity to both the CP-violating neutrino mixing phase and the neutrino mass-hierarchy. Beyond NO$\nu$A, the proposed Long-Baseline Neutrino Experiment (LBNE) is designed for much greater sensitity to the CP-violating phase while providing a very rich physics program. I will review the design, capabilities and schedule of both experiments.
        Speaker: Dr Jonathan Paley (Argonne National Laboratory (US))
        Slides
      • 16:15
        The Hyper-Kamiokande Experiment 15m
        We propose the Hyper-Kamiokande (Hyper-K) detector as a next generation underground water Cherenkov detector. It will serve as a far detector of a long baseline neutrino oscillation experiment envisioned for the upgraded J-PARC, and as a detector capable of observing -- far beyond the sensitivity of the Super-Kamiokande (Super-K) detector -- proton decays, atmospheric neutrinos, and neutrinos from astronomical origins. The baseline design of Hyper-K is based on the highly successful Super-K, taking full advantage of a well-proven technology. Hyper-K consists of two cylindrical tanks lying side-by-side, the outer dimensions of each tank being 48 m (W) x 54 m (H) x 250 m (L). The total (fiducial) mass of the detector is 0.99 (0.56) million metric tons, which is about 20 (25) times larger than that of Super-K. A proposed location for Hyper-K is about 8 km south of Super-K (and 295 km away from J-PARC) at an underground depth of 1,750 meters water equivalent (m.w.e.). The inner detector region of the Hyper-K detector is viewed by 99,000 20-inch PMTs, corresponding to the PMT density of 20% photo-cathode coverage (one half of that of Super-K). Hyper-K presents the potential for determination of the CP phase $\delta$ in the 3-flavor framework and therefore has discovery reach for CP violation in the lepton sector. With a total exposure of 5 years (one year being equal to 10$^7$ sec) to a 2.5 degree off-axis neutrino beam produced by the 1.66 MW J-PARC proton synchrotron, it is expected that the CP phase $\delta$ can be determined to better than 18 degrees for all possible $\delta$ values of and CP violation can be established with a statistical significance of 3$\sigma$ for 70% of the $\delta$ parameter space assuming the recent measured $\theta_{13}$ by T2K, Daya Bay, and RENO, and a known mass hierarchy. The mass hierarchy itself can be determined with more than 3$\sigma$ statistical significance for 46% of the $\delta$ parameter space. Furthermore, Hyper-K’s high statistics data sample of atmospheric neutrinos will allow us to extract additional information on the mass hierarchy and the octant of $\theta_{23}$. With a full 10 year duration of data taking, the significance for the mass hierarchy determination is expected to reach 3$\sigma$ or greater if $sin^2\theta_{23} > 0.4$. Hyper-K will extend the sensitivity to nucleon decays beyond what can be achieved by Super-K by an order of magnitude or more. The sensitivities to the partial lifetime of protons for the decay modes p →$e^+ \pi^0$ and p→$\var{\nu}K^+$ are expected to exceed 1x$10^{35}$ years and 2x$10&^{34}$ years, respectively. This is the only known, realistic detector option capable of reaching such a sensitivity for the p→$e^+\pi^0$ mode. The scope of studies at Hyper-K also covers high precision measurements of solar neutrinos, observation of both supernova burst neutrinos and supernova relic neutrinos, and dark matter searches.
        Speaker: Dr Hiroyuki Sekiya (Kamioka Observatory ICRR University of Tokyo)
        Slides
      • 16:30
        CP Violation at a Neutrino Factory 15m
        Exciting prospects for the discovery of CP violation in the neutrino sector have recently been made more likely by the measurement of the neutrino mixing angle theta_13. CP violation is a necessary condition for leptogenesis to be at the origin of the matter-antimatter asymmetry of the universe. A number of future options for establishing CP violation in neutrinos are possible, but the Neutrino Factory, in which beams of neutrinos are created from the decays of muons in a storage ring, offers the best sensitivity for this discovery and the most precise measurements of the mixing parameters and CP phase in the leptonic sector, which is related to the problem of flavour, the existence of three generations in nature and leptogenesis. The International Design Study for the Neutrino Factory (the IDS-NF) was established to deliver a Reference Design Report (RDR). The baseline design has been revised in the light of the new theta_13 results. The facility will provide 10^21 muon decays per year from 10 GeV stored muon beams pointing at a large (100 kton) Magnetised Iron Neutrino Detector (MIND) at a distance between 2000—2500 km. A description of the facility and a new upgraded neutrino oscillation analysis will be used to determine the CP sensitivities and the measurement of the CP phase delta. A compelling case for a Neutrino Factory will be made, based on the unprecedented precision in delta and the prospects of new physics in the neutrino sector that such a Neutrino Factory will be able to establish.
        Speaker: Prof. Kenneth Long (Imperial College London (UK))
        Slides
      • 16:45
        Getting the best out of T2K and NOvA 15m
        Neutrino oscillation physics stands at an important juncture today. With the reactor experiments having measured a moderately large value of $\theta_{13}$, determination of the neutrino mass hierarchy and $\delta_{CP}$ are the next problems to be solved. In this work, we explore the physics potential of T2K and NOvA, with the aim of extracting as much physics as possible from them before the next generation of experiments. At these baselines, the hierarchy-$\delta_{CP}$ degeneracy makes it difficult to measure the hierarchy independently of $\delta_{CP}$. For hierarchy determination, we find that the lower half plane (LHP) of $\delta_{CP}$ is favourable for NH and the upper half plane (UHP) is favourable for IH. If the favourable combinations (NH,LHP) or (IH,UHP) occur, then NOvA by itself can determine the hierarchy. If $\delta_{CP}$ lies in the unfavourable half plane, NOvA allows a large region with wrong hierarchy. Combined data from the planned runs of NOvA and T2K cannot determine the hierarchy even for the large $\theta_{13}$. However, the situation improves dramatically with a moderate increase in statistics. We demonstrate that the hierarchy can essentially be determined, even for unfavourable values of $\delta_{CP}$, if the exposures of NOvA and T2K are increased by a factor of 1.5 and 2 respectively. We find that addition of another experiment with a baseline of 130 km and beam power equivalent to T2K leads to a marginal improvement. It would seem that an experiment with a shorter baseline (and hence small matter effects) like T2K may be able to measure $\delta_{CP}$ without knowing the hierarchy. We show that this is not the case. No matter how small the matter effects, for some value of $\delta_{CP}$, any single experiment gives a wrong hierarchy-wrong $\delta_{CP}$ solution. However, combined data from 2*T2K+1.5*NOvA can determine the correct half plane of $\delta_{CP}$.
        Speaker: Mr Suprabh Prakash (Indian Institute of Technology - Bombay (IN))
        Slides
      • 17:00
        The Neutrino Flavour Puzzle in the Light of Large Theta_13 15m
        What is the origin of the observed fermion masses and mixing parameters? Neutrinos, with their small mass and large mixing, contribute an important part of this flavour puzzle. We discuss new developments regarding the flavour puzzle in the light of the recent discovery of comparatively large leptonic mixing theta_13. The new developments include the possibility to explain the observed value of theta_13 from charged lepton corrections in Grand Unified Theories, a new type of Constrained Sequential Dominance models leading to tri-maximal mixing with predicted theta_13 and unsuppressed CP asymmetries for leptogenesis, as well as a new class of models with predicted CP violation in the quark and lepton sectors.
        Speaker: Prof. Stefan Antusch (University of Basel (CH))
        Slides
      • 17:15
        Large \theta_{13} from minimal SO(10) unification 15m
        Unified theories based on SO(10) are ideal settings to address the masses and mixings of neutrinos. In minimal SO(10) models there are just two Yukawa coupling matrices, one associated with a 10 and one with a 126 of Higgs bosons (as opposed to five such matrices in the standard model). This results in a predictive framework for the neutrinos: all neutrino mixing angles and mass ratios can be computed in terms of the quark and lepton mass parameters. Even though quarks and leptons are unified, large neutrino mxing angles emerge simultaneously with small quark mixing angles. The prediction for the reactor neutrino mixing angle is \sin^2 (2\theta_{13}) = (0.08 - 0.095), which is nicely consistent with recent results from Daya Bay and RENO experiments. This talk will present the minimal model and its predictions, including the expectations for the neutrino CP violation paramter \delta. A new mechanism that connects neutrino masses with the baryon asymmetry of the universe will be presented, which relies on the B-L violating decays of GUT scale scalars.
        Speaker: Prof. Kaladi S. Babu (Oklahoma State University (US))
        Slides
      • 17:30
        The Simplest Neutrino Mass Matrix Revisited 15m
        In 2004, two of us published a texture, the ``Simplest'' neutrino mass matrix, which predicted $\sin{\theta_{13}}=\sqrt{2\Delta m^2_{sol}/3\Delta m^2_{atm}}$ and large $\delta_{CP}$. Using today's measured values for neutrino mass-squared differences, this prediction gives $\sin^2\! 2{\theta_{13}}\simeq 0.086^{+0.003}_{-0.006}$, compared with a measured value, found by averaging the results of the Daya Bay and RENO experiments, of $\sin^2\! 2{\theta_{13}}=0.097\pm0.012$. Here, we develop that texture separately for the cases of Dirac and Majorana neutrinos. For Dirac neutrinos, we use the measured value of $\theta_{13}$ to predict the lightest neutrino mass. For the Majorana case, we present a specific model underlying this successful texture, and we explore its phenomenology in the context of the See-saw mechanism. Large $CP$-violation is a generic prediction of the texture.
        Speaker: Prof. Paul Fraser Harrison (University of Warwick (UK))
        Slides
      • 17:45
        Renormalization Group Running of Physical Parameters in Neutrino Models and Extra Dimensions 15m
        In this talk, we investigate renomalization group running of neutrino parameters such as neutrino masses and leptonic parameters in different models. The models range from the inverse seesaw model to radiative versions of the scotogenic model as well as extra-dimensional models with both one and two extra spatial dimensions. We find that most models lead to large running for theta_12, whereas the running is negligible for theta_13 and theta_23. In addition, we show that a bimaximal mixing pattern at high energies (e.g. at the GUT scale) can lead to non-zero values for theta_13 at low energies. Finally, using the running of the Higgs self-coupling constant, we derive bounds on the cutoff scale for one of the extra-dimensional models.
        Speaker: Prof. Tommy Ohlsson (KTH Royal Institute of Technology (SE))
    • 09:00 18:00
      TR2 - Plenary 3 - Beyond the Standard Model - SUSY Plenary 3

      Plenary 3

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        NLO corrections to squark-squark production and decay at the LHC 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        We present the analysis of the signature jj+missing-ET(+X) via squark-squark production and direct decay into the lightest neutralino in next-to-leading order QCD within the framework of the minimal supersymmetric Standard Model. We provide a consistent, fully differential calculation of NLO QCD factorizable corrections to the given processes with on-shell squarks. Clustering final states into partonic jets, we investigate the experimental inclusive signature jj+missing-ET and we choose for illustration several benchmark scenarios. We compare resulting differential distributions with leading-order approximation rescaled by a flat K-factor and examine a possible impact for cut-and-count searches for supersymmetry at the LHC.
        Speaker: Mr Davide Pagani (Max-Planck-Institut für Physik (DE))
        Slides
      • 09:15
        Gluino pair production at threshold 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        We present a next-to-leading order calculation for the production of gluino pairs near threshold at the LHC. We show that threshold effects lead to a characteristic shape of the differential cross section around threshold and an increase of the total cross section.
        Speaker: Dr Peter Marquard (KIT (DE))
        Slides
      • 09:30
        Inclusive searches for squarks and gluinos with the ATLAS detector 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        Despite the absence of experimental evidence, weak scale supersymmetry remains one of the best motivated and studied Standard Model extensions. This talk summarises recent results on inclusive searches for supersymmetric squarks and gluinos in events containing jets, missing transverse momentum with or without leptons. The searches use the full data sample recorded in 2011 at sqrt(s)=7 TeV centre-of-mass energy by the ATLAS experiment at the LHC. Results using a sqrt(s)=8 TeV data sample from the 2012 run may also be presented.
        Speaker: Mr Moritz Backes (Universite de Geneve (CH))
        Slides
      • 09:45
        Searches for SUSY in hadronic final states at CMS 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        We present results of searches for SUSY production at CMS in events containing hadronic jets and missing energy. Various discriminants based on the event kinematics are employed to suppress standard-model backgrounds. The results are interpreted in the context of the Constrained Minimal Supersymmetric Standard Model, and of a number of "simplified models".
        Speaker: Dr Seema Sharma (Fermi National Accelerator Lab. (US))
        Slides
      • 10:00
        Searches for SUSY in final states with single leptons at CMS 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        We search for evidence of Supersymmetry in events with a single lepton, multijets and missing energy. The search is done with proton-proton collision data collected by the CMS detector at the CERN Large Hadron Collider. The backgrounds, which are primarily from W+jet and top quark production, are predicted with control samples in the data. The results are interpreted in terms of the constrained minimal supersymmetric extension of the standard model as well as more generic Simplified Model Spectra (SMS) topologies.
        Speaker: Prof. Kajari Mazumdar (Tata Institute of Fundamental Research)
        Slides
      • 10:15
        Searches for SUSY in events with two or more leptons at CMS 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        We present results of searches for SUSY production at CMS in events with multiple lepton production. These include final states with Z bosons decaying to lepton pairs, non-resonant same- and opposite-sign lepton pairs, and three or more isolated leptons. The results are used to exclude previously unexplored regions of the supersymmetric parameter space assuming R-parity conservation with the lightest supersymmetric particle being either a neutralino or gravitino.
        Speaker: Dr Pablo Martinez Ruiz Del Arbol (Eidgenoessische Tech. Hochschule Zuerich (CH))
        Slides
      • 10:30
        Refreshment Break 30m Plenary 3 (Melbourne Convention and Exhibition Centre)

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
      • 11:00
        Search for Pair Production of the Scalar Top Quark in Mu+Tau Final States 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        We present a search for the pair production of scalar top quarks (stop_1), the lightest supersymmetric partners of the top quarks, in ppbar collisions at a center-of-mass energy of 1.96 TeV, using data corresponding to an integrated luminosity of 7.3 fb^-1 collected with the D0 experiment at the Fermilab Tevatron Collider. Each scalar top quark is assumed to decay into a b quark, a charged lepton, and a scalar neutrino (snu). We investigate final states arising from stop_1 \bar{stop_1} --> b\bar{b}\mu\tau snu snu and stop_1 \bar{stop_1} --> b\bar{b}\tau\tau snu snu. With no significant excess of events observed above the background expected from the standard model, we set exclusion limits on this production process in the (m_{stop_1},m_{snu}) plane.
        Speaker: Dr James Alexander Kraus (Michigan State University (US))
        Slides
      • 11:15
        Searches for direct pair production of third generation squarks with the ATLAS detector 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        Naturalness arguments for weak-scale supersymmetry favour supersymmetric partners of the third generation quarks with masses not too far from those of their Standard Model counterparts. Scalar top or bottom quarks with masses less than a few hundred GeV can give rise to direct pair production rates at the LHC that can be observed in the data sample recorded by the ATLAS detector. The talk presents results from searches for direct stop and sbottom production using a data sample recorded in 2011 at sqrt(s)=7 TeV centre-of-mass energy by the ATLAS experiment at the LHC.
        Speaker: Dr Martin John White (University of Melbourne (AU))
        Slides
      • 11:30
        Searches for SUSY in events with third-generation particles at CMS 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        We present results of searches for SUSY production at CMS in events with third-generation signatures. Along with missing energy, the final states may include hadronic jets with or without b-quark tag, light leptons, and tau leptons. These features serve both to distinguish standard-model components, and for sensitivity to those SUSY models that lead to final states rich in heavy-flavored particles.
        Speaker: Dr Altan Cakir (Deutsches Elektronen-Synchrotron (DE))
        Slides
      • 11:45
        Searches for supersymmetry in events with photons or tau leptons and missing transverse momentum with the ATLAS detector 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        Models with gauge-mediated supersymmetry breaking predict that the lightest supersymmetric particle is a gravitino with negligible mass so that the phenomenology of the supersymmetric events produced at the LHC is determined by the next-to-lightest supersymmetric particle (NLSP). Depending on the model parameters, the NLSP can be a neutralino with significant bino admixture that will decay into a photon, or a stau that will decay into a tau lepton. The talk presents results from searches for supersymmetry in events with photons or taus and missing transverse momentum, using the data sample recorded in 2011 at sqrt(s)=7 TeV centre-of-mass energy by the ATLAS experiment at the LHC.
        Speaker: Mr Steffen Schaepe (Universität Bonn (DE))
        Slides
      • 12:00
        Search for Z+photon events with Large Missing Transverse Energy in ppbar Collisions at 1.96 TeV 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        We present the first search for supersymmetry (SUSY) in Zgamma final states with large missing transverse energy using data corresponding to an integrated luminosity of 6.2 fb-1 collected with the D0 experiment in ppbar collisions at sqrt(s)=1.96 TeV. This signature is predicted in gauge-mediated SUSY-breaking models, where the lightest neutralino is the next-to-lightest supersymmetric particle (NLSP) and is produced in pairs, possibly through decay from heavier supersymmetric particles. The NLSP can decay either to a Z boson or a photon and an associated gravitino that escapes detection. We exclude this model at the 95% C.L. for SUSY breaking scales of Lambda < 87 TeV, corresponding to neutralino masses of < 151 GeV.
        Speaker: Dr James Alexander Kraus (Michigan State University (US))
        Slides
      • 12:15
        Searches for SUSY in final states with photons at CMS 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        We present results of searches for SUSY production at CMS in events with one or two isolated photons. The results are interpreted in terms of guage-mediation models, with the gravitino as the lightest supersymmetric particle.
        Speaker: Prof. Mike Hildreth (University of Notre Dame (US))
        Slides
      • 12:30
        New results using the razor at the LHC 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        The "razor" at the LHC refers to a set of kinematical variables used to discriminate heavy new physics against standard model processes. The empirical modeling of the variables and their correlation leads to good sensitivity to new physics. In this talk we present some of the latest results obtained with the razor technique in CMS, ranging from SUSY to more exotic searches.
        Speaker: Dr Will Reece (CERN (CH))
        Slides
      • 12:45
        Lunch Break 1h 15m Plenary 3 (Melbourne Convention and Exhibition Centre)

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
      • 14:00
        Interpretations of CMS SUSY analyses in the simplified model space (SMS) 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        This talk we will present a compilation of all CMS new physics search results in the simplified model space and discuss the advantages and limitations of such interpretations.
        Speaker: Mr Christopher Rogan (California Institute of Technology (US))
        Slides
      • 14:15
        Constrained Supersymmetry after two years of LHC data: a global view with Fittino 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        We perform global fits to the parameters of the Constrained Minimal Supersymmetric Standard Model (CMSSM) and to a variant with non-universal Higgs masses (NUHM1). In addition to constraints from low-energy precision observables and the cosmological dark matter density, we take into account the LHC exclusions from searches in jets plus missing transverse energy signatures with about 5\,fb$^{-1}$ of integrated luminosity. We also include the most recent upper bound on the branching ratio $B_s\to\mu\mu$ from LHCb. Furthermore, constraints from and implications for direct and indirect dark matter searches are discussed. The best fit of the CMSSM prefers a light Higgs boson just above the experimentally excluded mass. We find that the description of the low-energy observables, $(g-2)_{\mu}$ in particular, and the non-observation of SUSY at the LHC become more and more incompatible within the CMSSM. A potential SM-like Higgs boson with mass around 126 GeV can barely be accommodated. Values for ${\cal B}(B_s\to\mu\mu)$ just around the Standard Model prediction are naturally expected in the best fit region. The most-preferred region is not yet affected by limits on direct WIMP searches, but the next generation of experiments will probe this region. Finally, we discuss implications from fine-tuning for the best fit regions.
        Speaker: Dr Xavier Prudent (Technische Universität Dresden)
        Slides
      • 14:30
        SUSY fits: Implications of LHC data on Constrained SUSY Models 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        We present the latest results of the MasterCode collaboration on global SUSY fits. Currently available experimental data are used to determine the preferred SUSY and Higgs boson mass scales. The data comprise a combination of high-energy SUSY searches, low-energy precision measurements and astrophysical data. We include all relevant LHC searches for SUSY, electroweak precision observables such as the W boson mass and the anomalous magnetic moment of the muon, B physics observables such as BR(b -> s gamma), as well as the cold dark matter density in the Universe.
        Speaker: Dr Albert De Roeck (CERN (CH))
        Slides
      • 14:45
        Constraints from direct dark matter searches, rare decays and LHC limits on Supersymmetry 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        The direct searches for Superymmetry can be complemented by direct searches for dark matter, if one assumes the Lightest Supersymmetric Particle (LSP) provides the dark matter of the universe. It is shown that within the CMSSM the direct searches are more sensitive than the direct LHC searches for large values of the squark masses, even if one considers the uncertainties from the local relic density and the form factors. A combined excluded region from LHC, rare decays, WMAP and XENON100 are provided, showing that gluinos below 1 TeV are excluded (m1/2 > 400GeV ) independent of the squark masses. This limit implies an LSP mass above 160 GeV in the CMSSM.
        Speaker: Prof. Dmitry Kazakov (JINR (RU))
        Slides
      • 15:00
        Implications of LHC Higgs and SUSY searches for MSSM 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        The implications of a discovery, or a non-discovery, of the lightest Higgs boson will be discussed in terms of constrained and general MSSM scenarios. Exploring the MSSM through the Higgs sector is an alternative and complementary path to direct searches, and tight constraints on the parameter space can be obtained. Such constraints will be discussed in addition to, very briefly, the interplay with other sectors.
        Speaker: Dr Nazila Mahmoudi (CERN (CH) & Clermont Ferrand University (FR))
        Slides
      • 15:15
        Light stop phenomenology 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        We discuss the phenomenology of light scalar tops (stops) in the minimal supersymmetric standard model (MSSM). We analyse the discovery potential of stops in the co--annihilation region at the Large Hadron Collider (LHC). The bino-like neutralino is the lightest supersymmetric particle (LSP) and the lighter stop is the next-to-LSP. Such scenarios can be consistent with electroweak baryogenesis and also with dark matter constraints. Provided, the mass difference between LSP and NLSP is small enough, we exploit the opportunity of a light and long-lived stop. We investigate the prospects to extract supersymmetric couplings from a decay length measurement at the LHC. Finally, we discuss the prospects to test relations of the superpotential. So far, no such tests have been proposed for the LHC.
        Speaker: Dr Jong Soo Kim (University of Adelaide (AU))
        Slides
      • 15:30
        Refreshment Break 30m Plenary 3 (Melbourne Convention and Exhibition Centre)

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
      • 16:00
        Searches for supersymmetric gaugino production in final states with leptons with the ATLAS detector 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        Naturalness arguments for weak-scale supersymmetry favour supersymmetric partners of the Higgs and electroweak gauge bosons, so-called gauginos, with masses not too far from those of their Standard Model counterparts. Gauginos with masses less than a few hundred GeV can give rise to direct pair production rates at the LHC that can be observed in the data sample recorded in 2011 by the ATLAS detector. The talk presents results from searches for gaugino production in final states with leptons.
        Speaker: Mr Tobias Kruker (Universität Bern (CH))
        Slides
      • 16:15
        One-loop effects on MSSM parameter determination via chargino production at the LC 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        Very precise measurements of masses and cross sections are expected to be achievable with a future linear collider. With such an accuracy one is even sensitive to quantum correction, which therefore must be incorporated in order to make meaningful predictions for the underlying new physics parameters. For the chargino--neutralino sector, this involves fitting one-loop predictions to expected measurements of the cross section and forward-backward asymmetry for chargino pair production and of the accessible chargino and neutralino masses. We consider three scenarios, each with characteristic features, chosen taking recent LHC SUSY and Higgs searches into account. Our analysis allows the accurate determination of the desired parameters and, additionally, access to the mass of the lighter stop that enters via loop corrections.
        Speaker: Dr Aoife Bharucha (University of Hamburg (DE))
        Slides
      • 16:30
        SUSY prospects for Linear Colliders in view of LHC results 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        We re-evaluate prospects for Supersymmetry at a future Electron Positron Linear Collider in light of the first 5 fb^-1 of data taken at LHC with $\sqrt{s}=7$ TeV proton proton collisions. Strong new limits from LHC SUSY searches, along with a hint of a Higgs boson signal around $m_h\sim 125$ GeV, suggest a paradigm shift from previously popular models to ones with new and compelling signatures. We present a variety interesting Linear Collider benchmark points in scenarios including: natural SUSY, hidden SUSY, the Kallosh-Linde model, NUHM2 with low $m_A$, as well as the remaining phase space of mSUGRA/CMSSM. While all proposed benchmark points at present elude LHC limits - and some will at least for a long time - they are compatible with electroweak precision and flavour observables and do offer intriguing case studies for a Linear Collider operating at $\sqrt{s} = 0.25-1$ TeV.
        Speaker: Dr Jenny List (DESY (DE))
        Slides
      • 16:45
        Exploring Sypersymmetry with future e+e- Linear Colliders 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        Proposed e+e- linear colliders a with center-of-mass energy from 250 GeV to 3 TeV (International Linear Collider, ILC and Compact Linear Collider, CLIC) are ideal tools for exploring supersymmetry, in addition to precision Higgs, top, W and Z physics and more generic searches for BSM phenomena. These machines cover a wide range of possible mass spectra of sparticles from 100 GeV to 1.5 TeV, and can explore the slepton and gaugino sectors as well as colored sparticles accessible by pair production. The excellent measurement performance of linear colliders for masses, spins, couplings, etc. provides the possibility to identify the underlying mechanisms after the discovery of SUSY-like particles. In this presentation we will focus on experimental studies of various SUSY models and particles, mainly with realistic detector simulations of ILD, SiD and CLIC geometries.
        Speaker: Dr Taikan Suehara (The University of Tokyo (JP))
        Slides
      • 17:00
        Searches for supersymmetry in resonance production and R-parity violating signatures with the ATLAS detector 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        An extended QCD sector beyond the minimal supersymmetric standard model or the admission of R-parity violation introduces new signatures to the search for supersymmetry at the LHC. Strongly interacting resonances may decay to jets, sleptons may decay via lepton-flavour violating processes and lightest supersymmetric particles may decay into many leptons with or without missing transverse momentum. The talk presents results from searches for scalar gluons and R-parity violation in dijet and multilepton final states using the full data sample recorded in 2011 at sqrt(s)=7 TeV centre-of-mass energy by the ATLAS experiment.
        Speaker: Mr Daniel Joseph Pomeroy (Brandeis University (US))
        Slides
      • 17:15
        Search for Squarks in R-parity Violating Supersymmetry in ep Collisions at HERA 15m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
        A search for squarks in R–parity violating supersymmetry is performed in e^\pm p collisions at HERA using the H1 detector. The full data sample taken at a centre-–of–-mass energy sqrt(s) = 319 GeV is used for the analysis, corresponding to an integrated luminosity of 255 pb^-1 of e+p and 183 pb^-1 of e^-p collision data. The resonant production of squarks via a Yukawa coupling lambda' is considered, taking into account direct and indirect R–-parity violating decay modes. Final states with jets and leptons are investigated. No evidence for squark production is found and mass dependent limits on lambda' are obtained in the framework of the Minimal Supersymmetric Standard Model and in the Minimal Supergravity Model. In the considered part of the parameter space, for a Yukawa coupling of electromagnetic strength lambda' = 0:3, squarks of all flavours are excluded up to masses of 275 GeV at 95% confidence level, with down–-type squarks further excluded up to masses of 290 GeV.
        Speaker: Dr Gerhard Immanuel Brandt (University of Oxford (UK))
        Slides
      • 17:30
        . 30m Plenary 3

        Plenary 3

        Melbourne Convention and Exhibition Centre

        Melbourne Australia
    • 09:00 18:15
      TR4 - Top Quark Physics Room 216

      Room 216

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        Inclusive top quark pair production cross - section (ATLAS) 15m
        We present measurements of the production of top quarks in proton - proton collisions at 7 TeV with the ATLAS detector at the Large Hadron Collider. The cross section of pair - produced top quarks is measured in several channels, including the single lepton, dilepton, all hadronic channel, some using information from b-tagging, as well as channels involving tau leptons.
        Speaker: Mr Frederic Derue (CNRS IN2P3 UPMC LPNHE (FR))
        Slides
      • 09:15
        Top quark pair production cross section at CMS 15m
        Precision measurements are presented of the top-pair production cross section in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV. The data are collected with the CMS experiment during the year 2011. The measurements are performed in several decay channels, the lepton+jets, the dilepton and the fully hadronic channels, including the tau-dilepton and tau+jets modes. B-jet identification is used to increase the purity of the selection. The backgrounds are determined using data-driven techniques. The results are combined with each other and compared with theory predictions.
        Speaker: Dr Ana Rodriguez Marrero (Universidad de Cantabria (ES))
        Slides
      • 09:30
        Differential top quark pair production (ATLAS) 15m
        After having established the ttbar production mechanism at LHC, interest is now focused on differential spectra of ttbar. Latest measurements performed in 7 TeV proton - proton collisions with the ATLAS detector at the Large Hadron Collider will be presented.
        Speaker: Dr Taylor Childers (CERN (CH))
        Slides
      • 09:45
        Differential cross sections in top pair events at CMS 15m
        We present measurements of various differential cross sections in top pair production in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV. The data are collected by the CMS experiment during the year 2011. Cross sections are measured differentially as a function of various variables, including the transverse momentum and rapidity of the (anti)top quark and the top-antitop system, as well as multiplicity and transverse momenta of jets produced in addition to the top pair. The cross sections are corrected for detector effects to the level of stable particles. The results are compared with various Monte Carlo models, as well as with theory predictions. The overall consistency of the features of top pair production with expectations from the standard model is investigated.
        Speaker: Dr Maria Aldaya Martin (Deutsches Elektronen-Synchrotron (DE))
        Slides
      • 10:00
        Cross section measurements of top quark production at CDF 15m
        The cross section for top-quark production, either in pairs through chromo-dynamical mechanisms or in single top-quarks through electro-weak based mechanisms, is a topic of great interest for testing theoretical predictions and constraining standard model parameters, as well as for searching for new physics in the top-quark sector. We present recent measurements of the top-quark pair production cross section in the all-leptonic channel and of the single top-quark production cross sections in the s- and t-channels. The combined s+t-channel single top-quark production cross section is also used to measure the |V_tb| matrix element of the CKM matrix. We also present a measurements of the top-quark pair production cross section and branching ratio in the all-leptonic channel where one of the two leptons defining the decay channel is required to be a reconstructed tau channel. The pair production cross section measurements are using the full CDF Run II sample.
        Speaker: Mr Matteo Corbo (Fermi National Accelerator Laboratory (US))
        Slides
      • 10:15
        NRQCD matching coefficient at next-to-next-to-next-to-leading order 15m
        We present new results for the matching coefficient between the QCD and the non-relativistic QCD (NRQCD) vector current. The matching coefficient constitutes one of the missing ingredients for a complete NNNLO theory prediction of top-quark pair production at a future linear collider. Furthermore, the matching coefficient is an important building block for the analysis of heavy quarkonia, which will allow for the precise determination of the bottom-quark mass from sum rules.
        Speaker: Dr Peter Marquard (KIT (DE))
        Slides
      • 10:30
        Refreshment Break 30m
      • 11:00
        Measurements of the inclusive cross section and of differential distributions in top quark pair production (D0) 15m
        We present measurements of the inclusive top quark pair production cross section in various final states including electrons, muons, tau leptons, large missing transverse energy, b-tagged and light flavor jets. We also show measurements of differential distributions of top quarks produced in pairs which provides a unique test of the dynamics of a heavy diquark system at large scales and represents a powerful search for new physics. The measured spectra, binned in several observables, are compared to simulations from different Monte Carlo generators. The measurements use up to 10 fb^-1 of data collected with the D0 detector at the proton-antiproton Tevatron collider at a center-of-mass energy of 1.96 TeV.
        Speaker: Prof. Christian Schwanenberger (University of Manchester)
        Slides
      • 11:15
        Measurements of single top quark production (ATLAS) 15m
        We present the result of measurements of single top - quark production in the t - and Wt - channels at 7 TeV proton - proton collisions with the ATL AS detector at the Large Hadron Collider. Information on the CKM matrix element |Vtb| is extracted from these measurements.
        Speaker: Mr Philipp Sturm (Bergische Universität Wuppertal (DE))
        Slides
      • 11:30
        Single top production in CMS 15m
        We present measurements of single top quark production, performed using CMS data collected in 2010-2011 at a centre-of-mass energy of 7 TeV. The cross section for the electroweak production of single top quarks is measured in the t-channel using various methods. The combined result is used to place a constraint on the CKM matrix element Vtb. The data sample analyzed allows to study also differential distributions. For the first time, single top production is measured in the tW channel.
        Speaker: Dr Gabriele Benelli (University of Kansas (US))
        Slides
      • 11:45
        Measurements of single top quark production cross sections and |Vtb| in ppbar collisions at sqrt(s)=1.96 TeV (D0 and CDF) 15m
        We present measurements of production cross sections of single top quarks in ppbar collisions at sqrt(s) = 1.96 TeV using data collected with the CDF and D0 experiments with integrated luminosities of up to 9.7 fb-1. Measurements of the total production cross section and of the t-channel cross section are presented, as well as searches for the s-channel production process. These measurements are also used to extract the Vtb element of the CKM mixing matrix
        Speaker: Dr Yvonne Peters (University of Göttingen & DESY (DE))
        Slides
      • 12:00
        Measurement of the top quark mass (ATLAS) 15m
        We present measurements of the top - quark mass in proton - proton collisions at 7 TeV with the ATLAS detector at the Large Hadron Collider. The top mass is determined by making use of a two - dimensional template method in the single lepton channel, and a one - dimensional template method in the all - hadronic channel. An indirect extraction of the top - quark mass from the measurement of the cross - section is also presented.
        Speaker: Dr Giuseppe Salamanna (University of London (UK))
        Slides
      • 12:15
        Measurements of the top quark mass (CMS) 15m
        The mass of the top quark is a fundamental parameter of the Standard Model. Measurements of the top quark mass are presented using data collected by the CMS experiment during the year 2011, in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV. Different reconstruction methods to extract the top quark mass are employed. The results of the various channels are combined and compared to the world average. The top mass is also extracted from the top pair cross section measured at CMS, including a determination of mtop in the MSbar scheme.
        Speaker: Dr Hartmut Stadie (Hamburg University (DE))
        Slides
      • 12:30
        Measurement of the top-antitop mass difference (CMS) 15m
        A measurement of the difference between the masses of top and anti-top quarks is presented using data collected by the CMS experiment during the year 2011, in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV. Events from the l+jets channel are selected by requiring one lepton and at least four jets in the final state. The measured value is compared with the prediction from the Standard Model, where no difference in mass between the top quark and the antitop quark is expected.
        Speaker: Mr Gerrit Van Onsem (Vrije Universiteit Brussel (BE))
        Slides
      • 12:45
        Lunch Break 1h 15m
      • 14:00
        Top quark mass measurements at CDF 15m
        The top-quark mass is an important parameter of the standard model. It is used, along with the W boson mass, to constrain the mass of the predicted Higgs boson. We present measurements of the top-quark mass and of the top-antitop mass difference, which tests the CPT symmetry, in the semi-leptonic top-quark pair decay channel using the template method and the full CDF Run II sample. These are currently the world's most precise top mass and mass difference single measurements.
        Speaker: Dr Hyun Su Lee (Ewha Womans University)
        Slides
      • 14:15
        Measurement of the top quark mass in ppbar collisions using events with two leptons (D0) 15m
        The mass of the top quark is a fundamental parameter of the standard model and has to be determined experimentally. The D0 experiment at the Fermilab Tevatron proton-antiproton collider with a centre-of-mass energy of 1.96 TeV has measured the top quark in various channels. We present the most recent measurements of the top quark mass in the dilepton and lepton+jets channels with up to 5.3 fb-1 as well as their combination and give an outlook on the final, most precise measurement of the top quark mass at D0.
        Speaker: Dr Oleg Brandt (University of Göttingen (DE))
        Slides
      • 14:30
        Tevatron and LHC top mass combinations 15m
        The top quark is the heaviest known elementary particle and its mass is a free parameter of the Standard Model. The CDF and D0 collaborations have previously measured the top quark's mass using the top quark pairs produced at the Tevatron proton-antiproton collider in many decay channels. We present here the combination of all published measurements with an integrated luminosity up to 5.8 fb^-1 using a proper treatment of the uncertainty correlations between different measurements. This combination leads to the most precise top quark mass determination with a relative precision of 0.54%.
        Speaker: Dr Frederic Deliot (CEA - Centre d'Etudes de Saclay (FR))
        Slides
      • 14:45
        Top Precision Studies at Linear Colliders 15m
        The top quark is the heaviest particle of the Standard Model and, thus, the particle most strongly coupled to the physics of electroweak symmetry breaking. A future linear e+e- collider will be able to make precision measurements of the top quark mass and width, of the detailed QCD physics of the top quark threshold, and of the top quark production and decay asymmetries. Both measurements at the top quark threshold and measurements in continuum production at 500 GeV have been analyzed with detailed full simulation studies performed within the frameworks of the CLIC conceptual design report and the ILC technical design report. Experiments at an e+e- linear collider have the capability of measuring the top quark mass with unprecedented accuracy, below 100 MeV, and making a direct precision measurement of the top quark width. Further, by using all properties of the e+e- environment -- the electroweak production mechanism, the ability for full event reconstruction, the excellent jet energy measurement, and the excellent b and c identification capabilities -- they make it possible to make precision measurements of the weak and electromagnetic couplings of the top quark, quantities that are directly sensitive to composite Higgs and extra-dimensional models of new physics.
        Speaker: Dr Marcel Vos (Universidad de Valencia (ES))
        Slides
      • 15:00
        Spin correlation and W helicity in top quark events with ATLAS 15m
        n 7 TeV proton - proton collisions at the LHC, pairs of top and anti-top quarks are expected to be mostly produced through gluon fusion, in contrast to production at the Tevatron, where quark annihilation dominates. The ATLAS experiment has now recorded a large number of top quark pairs, allowing this domain to be explored in detail. We present measurements of the spin correlation between top and anti-top quarks. The helicity fractions of W bosons from top quark decays are precisely predicted by the Standard Model and a deviation could reveal the presence of new physics. We also present a measurement of the W helicity fractions from top quark decays in ATLAS.
        Speaker: Dr Markus Jüngst (CERN)
        Slides
      • 15:15
        Spin correlations and W helicity in top events with CMS 15m
        Measurement of the polarisation of W bosons and top anti-top spin correlations in top-quark decays are presented. The analysis makes use of top-pair events in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV using data collected by the CMS experiment during the year 2011. Final states are selected where one of the two W bosons decays into electron-neutrino or muon-neutrino, and the other into quarks. From these events the W-boson helicity fractions and angular asymmetries are extracted. The spin information is extracted from the the angular distributions of the top quark decay products. The results, in agreement with the expectations from the Standard Model, are presented and used to set limits on anomalous contributions to the Wtb vertex.
        Speaker: Dr Suharyo Sumowidagdo (University of California Riverside (US))
        Slides
      • 15:30
        Refreshment Break 30m
      • 16:00
        Spin correlation in ttbar production (D0) 15m
        We present a measurement of the ratio of events with correlated t and tbar spins to the total number of ttbar events. This ratio f is evaluated using a matrix-element-based approach in events with a single lepton (electron or muon) and at least four jets and in events with two leptons (ee, emu, mumu) and at least two jets. We analyze ppbar collisions data corresponding to an integrated luminosity of 5.3-5.4 fb-1 collected with the D0 detector at the Fermilab Tevatron collider operating at a center of mass energy sqrt(s)=1.96$ TeV. Combining the results of the single lepton and dilepton final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in ttbar events with a significance of more than three standard deviations.
        Speaker: Dr Yvonne Peters (University of Göttingen & DESY)
        Slides
      • 16:15
        Measurement of top quark properties - electric charge and width (D0) 15m
        We present a measurement of the electric charge of the top quark and an improved determination of the total width of the top quark, Gamma_t, using 5.3 fb-1 of integrated luminosity collected by the D0 Collaboration at the Tevatron ppbar Collider. The top quark charge is reconstructed from the top quark decay products in events which have an isolated high-pT charged lepton, large missing transverse momentum, and at least four high-pT jets, at least two of which identified as b-quark jets by a neural network. We exclude the hypothesis that the top quark is an exotic quark of charge −4e/3 at a confidence level greater than six standard deviations and conclude that the observed top quark charge is in good agreement with the standard model value of 2e/3. The total width Gamma_t is extracted from the partial decay width Gamma(t->Wb), obtained from the t-channel single top quark production cross section, and the branching fraction B(t->Wb) measured in ttbar events. For a top mass of 172.5 GeV, the resulting width is Gamma_t = 2.00 +0.47-0.43 GeV which translates to a top-quark lifetime of tau_t = (3.29 +0.90-0.63) 10-25 s.
        Speaker: Prof. Christian Schwanenberger (University of Manchester (UK))
        Slides
      • 16:30
        Combination of CDF and D0 measurements of the W boson helicity in top quark decays 15m
        We report the combination of recent measurements of the helicity of the W boson from top quark decay by the CDF and D0 collaborations, based on data samples corresponding to integrated luminosities of 2.7 – 5.4 fb−1 of ppbar collisions collected during Run II of the Fermilab Tevatron Collider. Combining measurements that simultaneously determine the fractions of W bosons with longitudinal (f0) and right-handed (f+) helicities, we find f0 = 0.722 ± 0.081 [± 0.062 (stat.) ± 0.052 (syst.)] and f+ = −0.033 ± 0.046 [± 0.034 (stat.) ± 0.031 (syst.)]. Combining measurements where one of the helicity fractions is fixed to the value expected in the standard model, we find f0 = 0.682±0.057 [± 0.035 (stat.)±0.046 (syst.)] and f+ = −0.015±0.035 [± 0.018 (stat.)±0.030 (syst.)]. The results are consistent with standard model expectations.
        Speaker: Prof. Erich Ward Varnes (University of Arizona (US))
        Slides
      • 16:45
        Other top quark properties in ATLAS 15m
        Other properties of top quarks as measured with the ATLAS detector, using pp collisions at a center-of-mass energy of 7 TeV, are presented. In particular the charge of the quark is determined to be +2/3 as predicted by the Standard Model, while an exotic charge is excluded. The cross-section of additional photon radiation in top quark pairs is also measured and presented in this talk.
        Speaker: Dr Antonio Limosani (University of Melbourne (AU))
        Slides
      • 17:00
        Other top quark properties in CMS 15m
        Measurement of top quark properties, such as the top quark charge and the flavour contents in top quark pair events is presented using proton-proton collision data recorded with the CMS Experiment at the LHC at a centre-of-mass energy of 7 TeV. For the measurement of the top quark charge, the top quark pair events are reconstructed in the muon+jets final state and different top quark charge hypotheses (2/3e or -4/3e) are discriminated by use of the charge correlations between high-pT muons from W boson decays and soft muons from B-hadron decays in b jets. A normalised asymmetry of events categorised with a charge of either +2/3 e or −4/3 e is calculated. The fraction of top quarks decaying into a W-boson and a b-quark relative to all top quark decays, R=BR(t->Wb)/Sum(BR(t->Wq)), is determined by counting the jets identified as b-jets, using a model that relies on the b-tagging and mistagging efficiencies. The results are found consistent with SM predictions.
        Speaker: Ms Yvonne Küssel (RWTH-Aachen (DE))
        Slides
      • 17:15
        Top quark properties at CDF 15m
        The top-quark properties are of special interest for testing standard model predictions and for indirect searches for new physics due to the large mass of the top-quark, probing very short distances, and its uniquely short life time, eliminating hadronization complexities. We present recent measurements of the top-quark decay branching ratio, constraining the |V_tb| matrix element of the CKM matrix; of the helicity fractions of the W boson in the top-quark pair deacys in the semi-leptonic channel; of the spin correlation of the top-quark pair in the all-leptonic decay channel; and of the top-quark charge in the all-leptonic decay channel. All measurements are using the full CDF Run II sample.
        Speaker: Dr Youngdo Oh (Kyungpook National University (KR))
      • 17:30
        . 30m
        Speaker: MCEC Admin
    • 09:00 18:00
      TR5 & TR7 - Room 220 - B Physics and CP Violation, etc. Room 220

      Room 220

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        A proposal to solve some puzzles in semileptonic B decays 15m
        Some long-standing problems in the experimental data for semileptonic b -> c l nu decay rates have resisted attempts to resolve them, despite substantial efforts. We show that the presence of a relatively large decay rate into radially-excited D-mesons may alleviate several of these tensions simultaneously. In particular, their presence could help explaining the discrepancy between model calculations and experimental results for the first orbitally-excited doublets, known as the “1/2 vs. 3/2 puzzle”. In order to substantiate our hypothesis, we estimate the decay rate into the first two radially excited charmed states using a quark-model and light-cone sum-rules, finding that it is not unreasonable to expect O(1%) branching fraction for these decays.
        Speaker: Mr Florian Bernlochner (University of Victoria (CA))
        Slides
      • 09:15
        D+ Purely Leptonic and D0 Semi-leptonic Decays at BESIII 15m
        With the world largest data sample taken at psi(3770) peak with the BESIII detector at the BEPCII e+e- collider, the D+ purely leptonic and D0 semi-leptonic decays are studied. We present the preliminary branching fraction measurements of D+ -> mu nu, D0 -> K- e+ nu and D0 -> pi- e+ nu. We extract pseudoscalar decay constant of f_D using D+ purely leptonic decays and the hadronic form factors using the D0 semi-leptonic decays.
        Speaker: Prof. Ronald Poling (University of Minnesota (US))
        Slides
      • 09:30
        Kaon Physics at CERN: recent results from the NA48/2 experiment 15m
        Semileptonic kaon decays offer the most precise determination of the CKM matrix element |Vus|. The experimental precision is however limited by the knowledge of the form factors of this decay, since these enter both the phase space integral and the detector acceptances. The NA48/2 experiment presents new high precision measurements of the form factors of the semileptonic decays of charged kaons (K+- -> pi0 l+- nu), based on 4.3 million Ke3 and 3.5 million Kmu3 decays, both with negligible background. The result matches the precision of the current world average on the vector and scalar form factors and allows to significantly reduce the form factor uncertainty on |Vus|. In addition, the comparison of both channels sets tight constraints on lepton flavour violation and other possible new physics. The NA48/2 collaboration has also accumulated ~60000 semi-leptonic K charged decays Ke4(00) to pi0 pi0 e neutrino, increasing the world available statistics by several orders of magnitude. Background contamination below the percent percent level and very good pi0 reconstruction allow the first accurate measurement of the Branching Fraction and decay Form Factor at the percent level. The achieved precision makes possible the observation of small effects such as pi+ pi- to pi0 pi0 re-scattering below the 2 m(pi+) threshold. Concurrently, more than one million K charged decays Ke4(+-) to pi+ pi- e neutrino has been analyzed, leading to an improved determination of the Branching Fraction by a factor of 3 and detailed Form Factor studies. Both Ke4 modes decay properties bring new precise inputs to Low Energy QCD studies and can provide strong tests of ChPT predictions. While the above analyses are close to completion and should appear shortly with final results, future prospects include the observation of several 1000 decays in similar muonic modes Kmu4(00) (never observed) and Kmu4(+-) (7 events observed). Such poorly known modes could be studied also in the forthcoming NA62 experiment currently under construction.
        Speaker: Dr Cristina Biino (Universita e INFN (IT))
        Slides
      • 09:45
        Leptonic and semileptonic B decays with tau at BaBar 15m
        Within the standard model, the decay B+ --> tau+ nu has the largest branching fraction of any leptonic B decay, yet its reconstruction is made complicated by the multiple final-state neutrinos. The study of this decay is made possible by the ability to reconstruct the other B in the event, unique to the e+e- environment of the B factories. We present the result of an improved analysis using the full BABAR dataset, where the other B is tagged with a large number of hadronic decays. We observe evidence for B+ --> tau+ nu at more than 3 standard deviations, and discuss the implied constraints on models of new physics. The exclusive semileptonic transitions b -->c tau nubar are sensitive to physics beyond the standard model. For example, in type-II two-Higgs-doublet models, the B -->D(*) tau nubar branching fractions are functions of the ratio between tan(beta) and the charged Higgs mass. Using the full BABAR data set, we present measurements of the branching fractions of these decays, normalized relative to those of the decays B -->D(*) l nubar, where l is an electron or a muon. The measurements are performed using a reconstructed D (*) and an electron, muon, or tau recoiling against a fully-reconstructed B meson, taking advantage of the clean B-factory environment and high luminosity. The branching-fraction ratios are extracted from a simultaneous two-dimensional fit to the measured lepton spectrum and the reconstructed missing mass squared. The experimentally challenging background contributions from decays involving D** states are estimated using a control sample. We report the first observation of the semileptonic B --> D tau nubar decay and discuss implications of our results for scenarios of physics beyond the standard model.
        Speaker: Dr Guglielmo De Nardo (Napoli University and INFN (IT))
        Slides
      • 10:00
        Leptonic and semileptonic B decays at Belle 15m
        We present a measurement of the decay $B\to\tau\nu$ using the full Belle data set including $772 \times 10^6$ $B\bar{B}$ collected at the KEKB asymmetric-energy $e^+e^-$ collider. The $B\bar B$ pair events are tagged by fully reconstructing one B meson decaying in a hadronic mode and detecting the $B\to\tau\nu$ candidate in the recoil. We obtain the branching fraction for $B\to\tau\nu$ and present a direct determination of the product of the B meson decay constant $f_B$ and the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{ub}|$. The resulting constraints on the charged Higgs boson are also discussed.
        Speaker: Mr Youngmin Yook (Yonsei University)
        Slides
      • 10:15
        Charmless semileptonic B decays at BaBar 15m
        The q^2 dependence of exclusive semileptonic form factors may be used to test standard-model theoretical calculations, and the total branching fractions provide a measure of the CKM matrix element V_ub. We report on measurements of the differential branching fractions of the exclusive semileptonic decays B-->pi l nubar, B-->eta l nubar, B-->eta’ l nubar, and B-->omega l nubar as a function of q^2. We report the branching fractions for these decays and determine |V_ub| using theoretical predictions from sum-rule and unquenched-lattice QCD calculations. We report a comprehensive study of the partial branching fractions for inclusive b --> u l nbar transitions using decays recoiling against a fully reconstructed B meson performed with the full BABAR data sample. The partial branching fractions are measured in seven overlapping regions of phase space using different kinematic cuts to suppress the much more abundant b --> c l nubar decays. Values of the CKM element |V_{ub}| are determined using four independent calculations of the partial decay rates. The most precise result is obtained from a two-dimensional fit to the m_X vs. q^2 distributions, with no kinematic restriction other than requiring the lepton momentum to be greater than 1 GeV. Furthermore, we report a new limit on weak annihilation, studied using the isospin conjugated decays of the neutral and charged B mesons.
        Speaker: Prof. Abner Soffer (Tel Aviv University (IL))
        Slides
      • 10:30
        Semileptonic B/Bs decays at Belle 15m
        We present a search for the four-body semileptonic baryonic decay $B^-\to p\bar p\ell^-\bar\nu_\ell$ ($\ell=e,\ \mu$) based on a data sample of 772 million $B\bar B$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy electron-positron collider. In this study, a new neural-network based hadronic $B$-meson tagging method is applied. The theoretical expectation of the decay branching fraction is $\sim 1\times 10^{-4}$, which is within the experimental sensitivity of this search.
        Speaker: Mr Christian Oswald (Universität Bonn)
        Slides
      • 10:45
        Refreshment Break 15m
      • 11:00
        Tetraquark interpretation of the charged Bottomonium-like states $Z_b^\pm(10610)$ and $Z_b^\pm(10650)$ and implications 15m
        We present a tetraquark interpretation of the charged bottomonium-like states $Z^\pm_b(10610)$ and $Z^\pm_b(10650)$, observed by the Belle collaboration in the $\pi^\pm \Upsilon(nS)$ $(n=1,2,3)$ and $\pi^\pm h_b(mP)$ $(m=1,2)$ invariant mass spectra from the data taken near the peak of the $\Upsilon(5S)$. In this framework, the underlying processes involve the production and decays of a vector tetraquark $Y_b(10890)$, $e^+e^- \to Y_b(10890) \to [Z_b^\pm (10610)\pi^\mp, Z_b^\pm (10650)\pi^\mp]$ followed by the decays $[Z_b^\pm (10610), Z_b^\pm (10650)] \to \pi^\pm \Upsilon(nS), \pi^\pm h_b(mP)$. Combining the contributions from the meson loops and an effective Hamiltonian, we are able to reproduce the observed masses of the $Z_b^\pm (10610)$ and $Z_b^\pm (10650)$. The analysis presented here is in agreement with the Belle data and provides crucial tests of the tetraquark hypothesis. We also calculate the corresponding meson loop effects in the charm sector and find them dynamically suppressed.The charged charmonium-like states $Z_c^\pm(3752)$ and $Z_c^\pm(3882)$ can be searched for in the decays of the $J^{PC}=1^{--}$ tetraquark state $Y(4260)$ via $Y(4260) \to Z_c^\pm(3752)\pi^\mp$ and $Y(4260) \to Z_c^\pm(3882)\pi^\mp$, with the subsequent decays $(Z_c^\pm(3752),Z_c^\pm(3882)) \to (J/\psi, h_c)\pi^\pm$.
        Speaker: Dr Wei Wang (DESY (DE))
        Slides
      • 11:15
        Study of dimuon final states in the decay of B and Y mesons. 15m
        We present the observation of a narrow mass state decaying into Y(1s)+photon, where the Y(1s) is detected by its decay into a pair of oppositely charged muons and the photon is identified through its conversion into an electron-positron pair. The significance of this observation is 5.6 standard deviation. The mass of the state is centered at 10.551+/-0.014(stat)+/-0.017 GeV, which is consistent with that of the state recently observed by the ATLAS Collaboration. We also present an update of the search for the decay B0s-->mu+mu- using the full D0 data sample of about 10.4 fb-1 of integrated luminosity. In this analysis, backgrounds have been significantly reduced compared to earlier D0 measurements by addition isolation variables, by reconstructing additional vertices near the B0s decay vertex and by employing multivariate techniques to discriminate between signal and background.
        Speaker: Dr Claus Buszello (Uppsala University)
        Slides
      • 11:30
        Results on Bottom Baryons with the CDF II Detector 15m
        We present the latest results on the search for excited bottom baryon states Lambda_b* in proton-antiproton collisions with a center of mass energy of 1.96 TeV. Using a 10/fb data sample, we study the Lambda_b* resonance states in the Lambda_b0 pi+ pi- decay mode in events collected by the CDF II detector with a displaced vertex trigger.
        Speaker: Dr Igor Gorelov (University of New Mexico (US))
        Slides
      • 11:45
        Measurement of mass and lifetime of B-hadrons at ATLAS 15m
        Using data collected in 2011, the ATLAS Collaboration has measured the lifetime and mass of the Lambda_b, the lifetimes and masses of the B_d and B_s mesons, and the average lifetime for inclusive B production at 7 TeV center of mass energy in proton-proton collisions. The mass ot the Lambda_b is measured with the precision above the world average. Polarization measurements of the Lambda_b are planned.
        Speaker: Dr Konstantin Toms (University of New Mexico (US))
        Slides
      • 12:00
        Studies of exotic charmonium and bottomonium states with the CMS experiment 15m
        CMS has searched for exotic charmonium states in the data sample collected in proton-proton collisions at 7 TeV in 2011. The X(3872) state is reconstructed in the J/psi pi+ pi- decay channel and the production cross-section is computed by determining the ratio to psi(2S) production in the same decay channel. For the first time, prompt and non-prompt contributions to the X(3872) cross section are disentangled by looking at secondary vertices. Furthermore, we also report on searches for other exotic quarkonium states.
        Speaker: Keith Ulmer (University of Colorado at Boulder (US))
        Slides
      • 12:15
        Heavy flavour spectroscopy at LHCb 15m
        LHCb is a dedicated B physics experiment at the LHC. During the 2011 run the experiment collected 1.0 fb-1 of data. This large data sample allows to explore the b baryon sector with unprecedented precision. We will present the first observation of the Λb* baryons and measurements of the properties of Ξb and Ωb baryons. In addition we will present results on the production and properties of the Bc meson, including searches for previously unobserved decay modes.
        Speaker: Mr Raphael Märki (Ecole Polytechnique Federale de Lausanne (CH))
        Slides
      • 12:30
        Lunch Break 1h 15m
      • 13:45
        Decays and spectroscopy at Y(1S,2S) at Belle 15m
        Using samples of 102 million $\Upsilon(1S)$ and 158 million $\Upsilon(2S)$ events collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider, we study hadronic exclusive decays of these two bottomonium resonances to the three-body final states $\phi KK$, $\omega \pi\pi$ and $K^{\ast 0}(892) K^- \pi^+ + {\rm c.c.}$, as well as two-body processes including the Vector--Tensor ($\phi f_2'(1525)$, $\omega f_2(1270)$, $\rho a_2(1320)$, $K^{\ast 0}(892) \bar{K}_2^{\ast 0}(1430)+{\rm c.c.}$) and Axial-vector--Pseudoscalar ($K_1(1270)^+ K^-+{\rm c.c.}$, $K_1(1400)^+ K^- +{\rm c.c.}$, $b_1(1235)^+ \pi^-+{\rm c.c.}$) modes. Branching fractions are determined for processes with a statistical significance greater than $3\sigma$; otherwise, the upper limits on the branching fractions are set at 90% confidence level. The ratios of the branching fractions of $\Upsilon(2S)$ and $\Upsilon(1S)$ decay into the same final state are used to test the perturbative QCD prediction. The hadronic decays of the narrow $\Upsilon (nS)$ resonances ($n={}$1, 2, or 3) produce large numbers of $u\bar{u}\$, $d\bar{d}$, and $s\bar{s}$ pairs concentrated in a limited phase-space volume, which makes them ideal for searching for multiquark states with non-zero strangeness. Here we report on high sensitivity searches for inclusive production of the predicted $S=-2$ pentaquark baryon $\Xi^{--}$ and six-quark $H$ dibaryon using the 102 million event $\Upsilon (1S)$ and 158 million event $\Upsilon (2S)$ data samples collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The $\Xi^{--}$ search concentrates on the $\Xi\rightarrow \Xi^-\pi^-$ decay mode and has a branching fraction sensitivity at the $10^{-5}$ level; the $H$-dibaryon search includes the $H\rightarrow\Xi^- p$, $\Lambda\Lambda$ and $\Lambda p\pi^-$ decay channels with branching fraction sensitivities approaching $10^{-6}$. Decay branching fractions and momentum distributions for topologically similar inclusive processes $\Upsilon(nS)\rightarrow\Xi^0(1530)X$ and $\Xi_c^0 X$ are measured for the first time. Using samples of 102 million $\Upsilon(1S)$ and 158 million $\Upsilon(2S)$ events collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider, we search for the first time for double charmonium decays from $\chi_{bJ}$, $\Upsilon(1S)$ and $\Upsilon(2S)$ states. No significant signal is observed in these modes and the upper limits on the decay rates are obtained at the 90% confidence level. These limits are consistent with calculations using the NRQCD factorization approach. Using samples of 158 million $\Upsilon(2S)$ events collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider, we study the hadronic exclusive decays of $\Upsilon(1,2S)$ to baryon-antibaryon ($p\bar{p}, \Lambda\bar{\Lambda}, \Sigma\bar{\Sigma},\Xi\bar{\Xi}$) and 0, 1, or 2 mesons ($\pi^0$, $\eta$, and $\pi^{\pm}$). Branching fractions are determined for processes with statistical significance greater than $3\sigma$; otherwise, the upper limits on the branching fractions are set at 90% confidence level. The ratios of the branching fractions of $\Upsilon(2S)$ and $\Upsilon(1S)$ decay into the same final state are used to test the perturbative QCD prediction. The double cascade radiative transitions $\Upsilon(2S) \to \gamma\chi_{bJ}\to \gamma\gamma \Upsilon(1S)$ have been studied using a sample of 158 million $\Upsilon(2S)$ decays recorded with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. These provide the most precise measurement to date of the branching ratios ${\cal B}(\chi_{b0,1,2}(1P) \to \gamma\Upsilon(1S))$ and limits on the total widths of the $\chi_{b}$ states. Results are compared with potential models and recent NRQCD predictions.
        Speaker: Dr Matthew Barrett (University of Hawai'i at Manoa)
        Slides
      • 14:00
        Charm production and rare charm decays at LHCb 15m
        Flavour-changing neutral current decays such as c -> u l+ l– are highly suppressed in the Standard Model (SM), but may be enhanced by New Physics. For D0 -> μ+ μ–, the SM decay rate is dominated by long distance contributions but is still a few order of magnitudes below the current experimental limit. In decays such as D+ -> π+ μ+ μ–, measuring the differential branching ratio as a function of the μ+ μ– invariant mass is a sensitive probe for New Physics contributions. We present results of searches for rare charm decays with the 2011 LHCb data sample, corresponding to an integrated luminosity of 1.0 fb–1.
        Speaker: Dr Walter Bonivento (INFN Cagliari (IT))
        Slides
      • 14:15
        The charmonium spectroscopy and charmonium decay at BESIII 15m
        With the world largest data samples taken at J/psi, psi', and psi'' peaks with the BESIII detector at the BEPCII e+e- collider. The charmonium spectroscopy and charmonium decay dynamics are studied. We report new measurements of the resonant parameters of the spin-singlet states, eta_c, eta_c', and h_c, and their production rates in psi' transitions; we also report observations of many new decay modes of J/psi, psi', chi_cJ, and eta_c, and improved measurements of many existing modes.
        Speaker: Prof. Shan Jin (Institute of High Energy Physics)
        Slides
      • 14:30
        Charm decays and spectroscopy at BaBar 15m
        The flavor-changing neutral-current decays decays D0 --> e+e-, D0 --> mu+mu-, and D0-->gamma gamma are highly suppressed in the standard model, well below observable levels. The decay D0 --> e+mu- is further lepton-flavor violating, and thus can occur only through very slow neutrino mixing. Thus, these decays constitute sensitive probes for possible new-physics contributions. We report new limits on the branching fractions of these decays. The electron and di-photon channels, in particular, benefit greatly from the high photon efficiency and clean environment of the B factory. Charm decays that are very rare or forbidden within the standard model constitute a sensitive search for new physics. We report results of searches for 35 such decays of the D+, D0, D_s , and Lambda_c into final states containing two leptons plus a pion, kaon, or proton. This includes final states involving lepton-number or lepton-flavor violation. We obtain branching-fraction limits of order 10^-6. Most of these are the tightest limits to date, in some cases they are the only results published so far, and some cut into the allowed parameter spaces of published new-physics models. Precision properties of charm mesons help test and provide reference points for many of the tools and approximations used in hadronic calculations, such as lattice QCD computation of hadronic matrix elements. We present a new measurement of the natural line width of the D*+ meson and of the difference between the masses of the D*+ and the D0 mesons. Using the full BABAR dataset, we reconstruct the decays D*+ --> D0 pi+, with the D0 identified in its decays into K-pi+, K-pi+pi-pi+, K-pi+pi0, and Ks pi+pi-.We extract the D*+ width and the pole position in the mass difference Delta m in each sample by fitting the measured $\Delta m$ distribution to the sum of background and signal, modeled as a relativistic P-wave Breit-Wigner line shape convolved with a resolution function. Our results are several times more precise than the previous world average. We report results of measurements of the angular-momentum-excited charmed baryon Lambda_c(2880)+ decaying to Lambda_c+ pi+ pi- using approximatly 316 fb^{-1} of BaBar e+e- collision data. We reconstruct the Lambda_c+ candidates in the decay mode pKpi and measure the Lambda_c(2880)+ mass, width, and production cross section, and study resonances in the Lambda_c+ pi+ pi- final state. We report the first measurements of the relative branching fractions for decays of the Lambda_c(2880)+ into the final states Sigma_c^0(2455) pi+ , Sigma_c^++(2455) pi- , Sigma_c^++(2520) pi- , Sigma_c^0(2520) pi+, and the non-resonant Lambda_c+ pi+ pi- contribution.
        Speaker: Dr Romulus Godang (University of South Alabama (US))
        Slides
      • 14:45
        Studies of the $\psi(2S)$ and $\psi(3770)$ at KEDR 15m
        We present a measurement of the main parameters of the $\psi(2S)$ and $\psi(3770)$ resonances, which has been performed with the KEDR detector at the VEPP-4M $e^{+}e^{-}$ collider. Fitting the energy dependence of the multihadron cross section in the vicinity of the $\psi(2S)$ we obtained the mass value and the product of the electron partial width by the branching fraction into hadrons. These results are significantly precisely than any of the previous experiments. We present a measurement of the mass, total width and electron partial width of the $\psi(3770)$ meson. Interference of resonant and nonresonant $D\overline{D}$ production essential in the near-threshold region has been taken into account. We got two possible solutions for the $\psi(3770)$ electron partial width and the radiatively corrected nonresonant $D\overline{D}$ cross section at the mass of $\psi(3770)$.
        Speaker: Mr Korneliy Todyshev (Budker Institute of Nuclear Physics (RU))
        Slides
      • 15:00
        Charmonium-like states at BaBar 15m
        In the past few years, several new charmonium-like states have been observed above the open-charm threshold, with properties that disfavor their interpretation as conventional charmonium states. It is not clear whether all these states are unique. Specifically, it has been suggested that the X(3915), observed in gamma gamma ->J/psi omega, and the Y(3940), observed in B-->J/psi omega K, may be one and the same as the chi_c2(2P), which was discovered in gamma gamma -> D Dbar. We use the full BABAR dataset to study the process gamma gamma --> J/psi omega. We measure the mass and width of the X(3915) and conduct the first assessment of its spin to determine whether it is the chi_c2(2P) or a new state. We also search for the X(3872), which should be produced in gamma gamma events if it has spin and parity 2+, while the alternative J^P = 1+ assignment would preclude X(3872) production via this mechanism. Di-pion transitions are well known for vector charmonium states. However, they have not been studied for non-vector states, where they may shed light on the nature of some of the new charmonium-like resonances, which are not well understood and whose properties often disfavor interpretation as conventional charmonium. In particular, it has been suggested that the decay X(3872)-->eta_c(1S) pi+ pi- will favor identification of the X(3872) as the eta_c2. In addition, measurement of di-pion transition rates for well-understood charmonium states serves to test charmonium-model predictions. Using two-photon-fusion events, we perform the first search for the decays of the chi_c2(1S), eta_c(2S), X(3872), X(3915), and chi_c2(2P) into the final state eta_c(1S) pi+ pi-, and report limits on the branching fractions for these decays or on the products of the branching fractions and 2-photon widths. In recent years, several new Charmonium-like states have been discovered, which cannot be fully explained by a simple charmonium model. The Y(4260) was discovered by BABAR via its decay into J/psi pi pi. Its production in initial-state-radiation events determines its quantum numbers to be JPC=1--, so the fact that it has not been observed decaying into D* D*bar is in contradiction to the charmonium-model expectation. Other interpretations are also not in good agreement with the data. We use the full BABAR dataset to improve determination of the parameters of the Y(4260) and to study the pi+pi- system, which we find to be predominantly in an S-wave state, with a f0(980) component. We do not confirm the report from Belle of a broad structure around 4.01 GeV. A number of new charmonium-like states have been discovered recently, with properties that disfavor their identification as charmonium states. An understanding of the nature of these states requires precision measurements of their properties. Several of the new states are produced in initial-state-radiation events, indicating the quantum numbers JPC=1--. Of these, the Y(4660) has been observed only in the Belle experiment, and still requires independent confirmation. We report a new study of the final state psi(2S) pi+ pi- in initial-state-radiation events using the entire BABAR dataset. We measure the masses and widths of the Y(4360) and Y(4660), and study the di-pion mass spectrum distributions. Recent discoveries of new charmonium-like states have prompted development of various models to explain them. None of the models, including the standard charmonium interpretation, account well for all the properties of these states. A clear prediction of the 4-quark interpretation is the existence of charged charmonium-like states. Such states are the Z1(4050)+ and Z2(4250)+, which is been reported by Belle to be produced in B-->ZK and to decay into chi_c1 pi+. We search for these states in the decays B0-->chi_c1 pi- K+ and B- -->chi_c1 pi- Ks. We show that adequate treatment of the background requires addressing the angular distribution of the Kpi system, which produces features in the chi_c1 pi+ invariant-mass distribution if not properly handled. Once this is done, we see no evidence for the Z1(4050)+ and Z2(4250)+ states, and set upper limits on the branching fractions of the decays B-->ZK. We also report the total branching fractions of the decays B0-->chi_c1 pi- K+ and B- -->chi_c1 pi- Ks.
        Speaker: Dr Valentina Santoro (INFN Ferrara (IT))
        Slides
      • 15:15
        Charmonium and exotic particles at Belle 15m
        We present the study of narrow charmonium(-like) resonances by $\chi_{c1,c2} \gamma$ final states in $B \to \chi_{c1,c2} \gamma K$ decays at Belle. The results are based on the full $\Upsilon(4S)$ data sample corresponding to $772 \times 10^6\ B\bar B$ pairs recorded by the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We present the study of $B^{\pm} \to J/\psi\, \eta\, K^{\pm}$ decays at Belle. Along with the branching fraction measurement, we search for narrow charmonium-like resonances in the $J/\psi\, \eta$ final state. The analysis is based on the full $\Upsilon(4S)$ data set corresponding to $772 \times 10^6\ B\bar B$ pairs collected by the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We present the results of an amplitude analysis of the decay $\bar B^0 \to J/\psi K^- \pi^+$. A search for charged charmonium-like states in the $J/\psi \pi^+$ system has been performed. The analysis is based on a 711 fb${}^{-1}$ data sample collected by the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The cross section for $e^+ e^- \to J/\psi\, \eta$ between $\sqrt{s}={}$3.8 GeV and 5.3 GeV is measured using 980 fb${}^{-1}$ of data on and off the $\Upsilon(nS)$ resonances collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. Two resonant structures at the $\psi(4040)$ and $\psi(4160)$ are observed in the $J/\psi\, \eta$ invariant mass distribution. The transition rates of $\psi(4040)$ and $\psi(4160)$ to the $J/\psi\, \eta$ final state are measured. This is the first measurement of this hadronic transition mode. No significant signals of the $Y(4008)$, $Y(4260)$, $Y(4360)$, or $Y(4660)$ are observed in the $J/\psi\, \eta$ final state. We search for a doubly charmed tetraquark ($T_{cc}$) using a large data sample collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. Various hadronic models, which are in good agreement in the baryon and meson sectors, show different results for tetraquarks. The production of $T_{cc}$ plays a crucial role for discriminating among these models. We report preliminary results of a search for decays of an exotic state $X$ to various modes with the $\eta_c$ meson: $\eta_c \pi^+ \pi^-$, $\eta_c \omega$, $\eta_c \eta$, and $\eta_c \pi^0$. The analysis is based on a data sample of $772 \times 10^6\ B \bar B$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider.
        Speaker: Dr Bruce Yabsley (University of Sydney (AU))
        Slides
      • 15:30
        Two-photon collisions at Belle 15m
        The invariant mass spectrum of the $\eta' \pi^+ \pi^-$ final state produced in two-photon collisions is obtained using 673 fb$^{-1}$ of data on and off the $\Upsilon(4S)$ collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The $\eta_c$ mass, width and the product of the two-photon width and the branching fraction of the decay into $\eta' \pi^+ \pi^-$ are measured. We also report the first evidence for the $\eta(1760)$ decays to $\eta' \pi^+\pi^-$. From a fit of the mass spectrum with the coherent $X(1835)$ and $\eta(1760)$ resonances, we set a 90% confidence level upper limit on the product $\Gamma_{\gamma\gamma} {\cal B}$ for the $X(1835)$.
        Speaker: Dr Hideyuki Nakazawa (National Central University)
        Slides
      • 15:45
        Refreshment Break 15m
      • 16:00
        The Standard Model confronts CP violation in D^0 -> pi^+ pi^- and D^0 -> K^+ K^- 15m
        The recently measured direct CP asymmetries in the processes D^0 -> pi^+ pi^- and D^0 -> K^+ K^- show a significant deviation from the naive Standard Model expectation. Using a general parameterization of the decay amplitudes, we show that the measured branching ratios imply large SU(3) breaking and large violations of the naive 1/N_c counting. Furthermore, rescattering constrains the I=0 amplitudes in the pi pi and K K channels. Combining all this information, we show that, with present errors, the observed asymmetries are marginally compatible with the Standard Model. Improving the experimental accuracy could lead to an indirect signal of new physics.
        Speaker: Dr Satoshi Mishima (INFN Rome (IT))
        Slides
      • 16:15
        Charm mixing and CP violation at BaBar 15m
         We present a measurement of the D0-antiD0 mixing and CP-violation parameters y_CP and Delta y using the full BABAR dataset. We reconstruct samples of D*-tagged and untagged D0 decays to the final states K+K-, K+/-pi-/+ and pi+pi-. From a simultaneous fit to the different channels, we extract the effective lifetimes of the D0 decaying to the CP-even final states and the flavor-specific final state, and combined them into the mixing parameter y_CP and the CP-violation parameter Delta y. Utilizing the full dataset, new track reconstruction, optimized event selection, and the simultaneous fit to both tagged and untagged samples, we improve both the statistical and the systematic errors with respect to all previous measurements. CP violation in the charm system is predicted to be small, yet evidence for direct CP violation has been reported by the LHCb experiment in 2-body D0 decays. A full understanding of the effect requires CP measurements in multibody decays as well. Using the full BABAR Upsilon(4S) data set, we investigate CP violation in the decay D+ --> K+K-pi+. In addition to the overall decay-rate asymmetry, we present CP violation results using model-dependent and model-independent Dalitz-plot analyses. Recent evidence from LHCb of time integrated asymmetry in 2-body D0 decays motivates further studies of CP violation in the charm-meson system, which is required for a full understanding of the phenomenon. Charm CP-violation studies at the B factories are competitive with LHCb in particular for decay modes that involve neutral particles, and several such measurements have already been performed by BABAR and Belle. We report here new results of time-integrated CP-violation measurements in the decay modes D+ --> Ks K+, D_s --> Ks K+, and D_s --> Ks pi+. Our measurements are the most precise to date, due to very efficient Ks reconstruction and excellent control of systematic errors, including use of a large control sample to reduce the reconstruction asymmetries produced by detector-induced effects. We compare our results with the standard-model prediction, allowing for effects due to K0-K0bar interference.
        Speaker: Ms Giulia Casarosa (SLAC & INFN (IT))
        Slides
      • 16:30
        Measurements of CP violation in charm decays at CDF 15m
        Measurements of CP violation in charm meson decays are presented using the complete 10/fb dataset collected by the CDF experiment at the Tevatron. The difference between CP-violating asymmetries in D0-->K+K- and D0-->pi+pi- decays is observed to be 2.8 sigma different form zero, supporting evidence of CP violation in charm reported by other experiments. In addition, world's most precise measurements of individual asymmetries in D0-->hh and D0->Ks pi pi are reported.
        Speaker: Mr Diego Tonelli (CERN (CH))
        Slides
      • 16:45
        Studies of charm mixing and CP violation at LHCb 15m
        LHCb collected 1.0 fb–1 of data in 2011, corresponding to O(10^8) fully reconstructed decays of open charm hadrons. This data provides unprecedented samples of charmed hadrons, allowing precise measurements of mixing and CP violation parameters. We report the results of searches for mixing and CP violation in 2-body and multi-body decays, with analyses using part or all of the 2011 data.
        Speaker: Dr Jordi Garra Tico (University of Cambridge (UK))
        Slides
      • 17:00
        Direct CP violation in charm at Belle 15m
        We measure the time-integrated rate $R_{WS}$ of the wrong-sign decay $D^0 \to K^+ \pi^- \pi^+ \pi^-$ relative to the Cabibbo-favored right-sign process. The data was recorded with the Belle detector and corresponds to an integrated luminosity of 800 fb${}^{-1}$ at the $\Upsilon(4S)$ resonance. We also report a measurement of the $CP$ asymmetry factor $A_{CP}$ by fitting the $D^0$ and $\bar D^0$ samples separately. We observe evidence for $CP$ violation in the decay $D^+ \to K^0_S \pi^+$ using a data set corresponding to an integrated luminosity of 977 fb${}^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The $CP$ asymmetry in the decay is measured to be $(-0.363 \pm 0.094 \pm 0.067)\%$, which is 3.2 standard deviations away from zero. This is consistent with the expected $CP$ violation due to neutral kaons in the final state. Using data from the Belle experiment at KEKB asymmetric-energy $e^+ e^-$ collider, we present a measurement of the weak-decay asymmetry parameter $\alpha_{\Lambda_c}$ in the decay $\Lambda_c^+ \to \Lambda \pi^+$. By comparing the results for particle and antiparticle decays, we also present a measurement of the $CP$ violating asymmetry parameter $A_{CP} = (\alpha_{\Lambda_c} \alpha_{\Lambda} - \alpha_{\bar \Lambda_c} \alpha_{\bar \Lambda}) /(\alpha_{\Lambda_c} \alpha_{\Lambda} + \alpha_{\bar \Lambda_c} \alpha_{\bar \Lambda})$. We report preliminary results on the time-integrated $CP$ asymmetry $A_{CP}$ in the decay $D^0 \to \pi^+\pi^-\pi^0$ using a 673 fb$^{-1}$ data sample collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We set an upper limit on the rate of the Dalitz-distribution-dependent asymmetry between two flavor samples: $D^0$ and $\overline{D^0}$.
        Speaker: Mr Byeong Rok Ko (Korea University (KR))
        Slides
      • 17:15
        Charm mixing at Belle 15m
        We present an updated measurement of the mixing parameter $y_{CP}$ in the decays $D^0 \to K^+ K^-$ and $D^0 \to \pi^+ \pi^-$. The results are obtained from the full data set of 1 ab${}^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We report a measurement of $D^0 - \bar D^0$ mixing in $D^0 \to K^0_S \pi^+ \pi^-$ decays using a time-dependent Dalitz plot analysis. The results are obtained from a large data sample collected on the $\Upsilon(4S)$ and $\Upsilon(5S)$ resonances with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider.
        Speaker: Mr Tao Peng (University of Science & Technology of China)
        Slides
      • 17:30
        CP violation in charm decays: Standard Model and Beyond 15m
        CP violation in charm decays is studied in light of recent experimental findings of LHCb and CDF.Flavor symmetry violations as manifestly displayed in the data are incorporated without theoretical assumptions. Repercussions for CP asymmetries for some of the B (Bs) -decays are incorporated. Range of expectations from the Standard Model are quantified. Further directions to pursue to isolate potential contributions from new physics are pointed out. This talk is based in part on work done in collaboration with Thorsten Feldman and Soumitra Nandi.
        Speaker: Dr Amarjit Soni (Brookhaven National Laboratory (US))
        Slides
      • 17:45
        . 15m
    • 09:00 19:30
      High School Masterclass Australian Synchotron

      Australian Synchotron

      • 09:00
        High School Masterclass 9h Australian Synchotron

        Australian Synchotron

      • 18:00
        Public Lecture 1h The Spot (The University of Melbourne)

        The Spot

        The University of Melbourne

    • 09:00 18:00
      Plenary3 - The Standard Model -TR1 Plenary 3

      Plenary 3

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        Precision electroweak measurements at SuperB with polarised beams 15m
        SuperB has a programme of precision electroweak measurements made possible using data at the Y(4S) by virtue of beam polarisation. These measurements include sin^2 theta_W obtained via left-right asymmetry measurements of e+e- transitions to pairs of fermions. The precision obtainable at SuperB is expected to match that of the LEP/SLC world average at the center of mass energy of 10.58GeV. Once the Higgs mass is known the SuperB precision electroweak programme will become a search for physics BSM
        Speaker: Prof. Michael Roney (University of Victoria (CA))
        Slides
      • 09:15
        One-Loop Calculation of the Oblique S Parameter in Higgsless Electroweak Models 15m
        If the Higgs boson does not show up soon, we should look for alternative mechanisms of mass generation, satisfying the many experimental constraints which the Standard Model (SM) has successfully fulfilled so far. Following this aim, we present a one-loop calculation of the oblique S parameter within Higgsless models of Electroweak Symmetry Breaking (EWSB) and analyze the phenomenological implications of the available electroweak precision data. Within an effective Lagrangian we implement the chiral symmetry breaking SU(2)_L x SU(2)_R -> SU(2)_(L+R) with Goldstones, gauge bosons and one multiplet of vector and axial-vector massive resonance states. Using the dispersive representation of Peskin and Takeuchi and imposing the short-distance constraints dictated by the operator product expansion, we obtain S at the next-to-leading order in terms of a few resonance parameters. We have found that, in order to match the experimental determination of the S parameter, the resonance masses are required to be over the TeV scale in this kind of strongly-coupled EWSB scenarios.
        Speaker: Dr Ignasi Rosell (Universidad CEU Cardenal Herrera and IFIC (ES))
        Slides
      • 09:30
        HERWIRI2: Exponentiated Electroweak Corrections in a Hadronic Event Generator 15m
        Reaching the desired precision level for W and Z processes at the LHC will require a mixture of higher-order QCD and electroweak corrections. HERWIRI2 is a step in implementing QED x QCD exponentiation in a hadronic event generator. This program implements leading electroweak corrections and coherent exclusive exponentiation in a HERWIG environment. We discuss the status of the program, recent tests, and future developments.
        Speaker: Dr Scott Yost (The Citadel (US))
        Slides
      • 09:45
        W and Z studies at 8 TeV at CMS 15m
        The production of W and Z bosons has been observed in pp collisions at a center-of-mass energy of 8 TeV using data collected in the CMS experiment. W events were selected containing an isolated, energetic electron or muon. Z events were selected containing a pair of isolated, energetic electrons or muons. Data-driven methods are used to estimate reconstruction and triggering efficiencies, and well as the main backgrounds. We present the W and Z signal yields and the extracted cross-sections at sqrt(s)=8 TeV, as well as the ratio of 8 TeV / 7 TeV cross sections.
        Speaker: Dr Anna Kropivnitskaya (University of Florida (US))
        Slides
      • 10:00
        ATLAS Electroweak measurements from W and Z properties 15m
        Precise measurements of W and Z production, including the polarisations of W bosons and of tau leptons produced in W decays are presented. They provide tests of lepton universality and constrain electroweak parameters.
        Speaker: Dr Joshua Moss (Ohio State University (US))
        Slides
      • 10:15
        ATLAS measurements of W/Z+gamma, searches for new physics and constraints on triple-gauge couplings 15m
        Differential and total visible cross sections for W+photon and Z+photon production are measured and compared to the predictions of the standard model. Limits on anomalous triple-gauge couples are derived, and the data are used to search for physics beyond the standard model.
        Speaker: Prof. Zhengguo Zhao (Univ. of Science & Tech. of China (CN))
      • 10:30
        Refreshment Break 30m
      • 11:00
        Wgamma and Zgamma Production in 7Tev pp collisions 15m
        We present the measurement of Wgamma and Zgamma production cross sections using data corresponding to the full 2010 and 2011 periods of the LHC run. For charged lepton decay modes of W and Z bosons the total cross sections are measured for photon transverse energy greater than 15 GeV. We also present the first measurement of Zgamma production cross section using the nunugamma final state for photon transverse energy greater than 145 GeV. The results are also interpreted in terms of limits of anomalous trilinear gauge couplings.
        Speaker: Dr Syue-Wei Li (National Central University (TW))
        Slides
      • 11:15
        Measurement of W/Z+gamma production and limits on triple gauge couplings in ppbar collisions at sqrt(s)=1.96 TeV 15m
        We measure the cross section and differential distributions for the production of a weak bosons (W or Z) in association with a photon in data collected with the D0 detector at the Fermilab Tevatron ppbar collider at sqrt(s)=1.96 TeV and corresponding to integrated luminosities of up to 6.2 fb-1. The W and Z bosons are identified via their leptonic decays to electrons or muons. The results obtained are consistent with the standard model predictions for from next-to-leading order calculations. The differential distributions are used to set limits on possible anomalous couplings in the triple gauge boson vertices.
        Speaker: Prof. Heidi Schellman (Northwestern University)
      • 11:30
        Electroweak corrections to vector-boson pair production at the LHC 15m
        W-boson pair production has been studied extensively during the LEP era, amongst others leading to a precise determination of the W-boson mass and width. At the LHC, vector-boson pair production will be of similar importance. Such processes constitute an important irreducible background to SM-Higgs production in the intermediate-mass region and have already been used to exclude a wide range of mass parameters. Moreover, vector-boson pair production is a perfect candidate to probe the non-abelian structure of the SM at highest energies, possibly facilitating the discovery of BSM physics. Therefore, it is obvious that theoretical predictions with high accuracy are needed to benefit from the great experimental possibilities provided by the LHC. In this work, we present the first calculation of the full one-loop electroweak corrections to WW, WZ, and ZZ production at hadron colliders, which give rise to large contributions at high transverse momenta. In addition, photon-induced processes are discussed in detail which contribute significantly to the W-pair production cross section at high invariant masses.
        Speaker: Dr Tobias Kasprzik (KIT (DE))
        Slides
      • 11:45
        WW, WZ and ZZ production at CMS 15m
        We present studies of WW, WZ and ZZ diboson production in pp collisions based on data recorded by the CMS detector at the LHC. These include precise measurements the production cross section of these processes at center-of-mass energies of 7 and 8TeV . The leptonic decay modes of the W and Z bosons are used. The results are interpreted in terms of constraints on anomalous triple gauge couplings. In addition the first observation of the decay Z to 4 charged leptons is reported.
        Speaker: Mr Kalanand Mishra (Fermi National Accelerator Lab. (US))
        Slides
      • 12:00
        ATLAS measurements of WW, WZ and ZZ 15m
        ATLAS measurements of diboson production processes involving ZZ, WW and WZ final states are presented. Differential and total visible cross sections are measured for channels involving leptons and neutrinos, and differential distributions are presented. In the ZZ->2l2nu and WW->lnulnu channels, jet vetos are applied. Total cross sections are derived, and limits are set on anomalous triple-gauge couplings.
        Speaker: Dr Chris Hays (University of Oxford (GB))
        Slides
      • 12:15
        Measurements of WW and WZ production in W + jets final states in ppbar collisions 15m
        We study WW and WZ production with l nu q q (l=e,mu) final states using data collected by the D0 detector at the Fermilab Tevatron Collider corresponding to 4.3 fb-1 of integrated luminosity from ppbar collisions at sqrt(s)=1.96 TeV. Assuming the ratio between the production cross sections sigma(WW) and sigma(WZ) as predicted by the standard model, we measure the total WV (V=W,Z) cross section to be sigma(WV)= 19.6^{+3.2}_{-3.0} pb, and reject the background-only hypothesis at a level of 7.9 standard deviations. We also use b-jet discrimination to separate the WZ component from the dominant WW component. Simultaneously fitting WW and WZ contributions, we measure sigma(WW) = 15.9^{+3.7}_{-3.2} pb and sigma(WZ) = 3.3^{+4.1}_{-3.3} pb, which is consistent with the standard model predictions.
        Speaker: Mr Gregorio Bernardi (LPNHE University of Paris (FR))
        Slides
      • 12:30
        Lunch Break 1h 30m
      • 14:00
        Measurement of the WZ/ZZ(Z-->bbbar) Production Cross Section at D0 in ppbar Collisions at sqrt(s)=1.96 TeV 15m
        We present a combined measurement of the cross section for the simultaneous production of two vector bosons (WZ,ZZ), where one of the bosons decays leptonically (W-->lv, Z-->ll or Z-->vv) and the other Z boson decays to bbar. The measurement uses the complete Run 2 dataset collected with the D0 detector in ppbar collisions at sqrt(s)=1.96 TeV, and combines the three leptonic decay modes mentioned above. This final state is a direct analog to SM Higgs searches in final states of leptons plus bottom quark pairs, and thus provides a crucial validation benchmark of the Higgs boson signal isolation techniques involved.
        Speaker: Dr Bjorn Penning (Fermi National Accelerator Laboratory)
        Slides
      • 14:15
        CDF searches for diboson production in final states with heavy flavor jets 15m
        We present the results of CDF searches for diboson production in final states with jets identified as originating from heavy flavor quark decays. In particular, searches for WZ/ZZ production where the first W or Z boson decays leptonically and the second Z decays into a pair of bottom or charm quarks mimic primary Tevatron searches for a low mass Higgs with subsequent decay into a pair of bottom quarks produced in association with a W or Z boson. CDF's ability to observe diboson production in these final states provides a critical validation of the tools, techniques, and background modeling used in our H->bb searches.
        Speaker: Dr Marco Trovato (Fermi National Accelerator Laboratory (US))
        Slides
      • 14:30
        Improved sensitivity to charged Higgs searches un top quark decays $t \to bH^+ \to b(\tau^+\nu_\tau)$ at the LHC using $\tau$ polarisation and multivariate techniques 15m
        We present an analysis with improved sensitivity to the light charged Higgs ($m_{H^+} < m_t-m_b$) searches in the top quark decays $t \to b H^+ \to b (\tau^+\nu_\tau) + ~{\rm c.c.}$ in the $t\bar{t}$ and single $t/\bar{t}$ production processes at the LHC. In the Minimal Supersymmetric Standard Model (MSSM), one anticipates the branching ratio ${\cal B} (H^+ \to \tau^+\nu_\tau)\simeq 1$ over almost the entire allowed $\tan \beta $ range. Noting that the $\tau^+$ arising from the decay $H^+ \to \tau^+\nu_\tau$ are predominantly right-polarized, as opposed to the $\tau^+$ from the dominant background $W^+ \to \tau^+\nu_\tau$, which are left-polarized, a number of $H^+/W^+ \to \tau^+\nu_\tau$ discriminators have been proposed and studied in the literature. We consider hadronic decays of the $\tau^\pm$, concentrating on the dominant one-prong decay channel $\tau^\pm \to \rho^\pm \nu_\tau$. The energy and $p_T$ of the charged prongs normalised to the corresponding quantities of the $\rho^\pm$ are convenient variables which serve as $\tau^\pm$ polariser. We use the distributions in these variables and several other kinematic quantities to train a boosted decision tree (BDT). Using the BDT classifier, and a variant of it called BDTD, which makes use of decorrelated variables, we have calculated the BDT(D)-response functions to estimate the signal efficiency vs. the rejection of the background. We argue that this chain of analysis has a high sensitivity to light charged Higgs searches up to a mass of 150 GeV in the decays $t \to b H^+$ (and charge conjugate) at the LHC. For the case of single top production, we also study the transverse mass of the system determined using Lagrange multipliers.
        Speaker: Mr Javier Llorente (Universidad Autónoma De Madrid (ES))
        Slides
      • 14:45
        Search for charged Higgs bosons decaying via H+->taunu in ttbar events with the ATLAS detector 15m
        The results of a search for charged Higgs bosons are presented. The analysis is based on proton-proton collision data recently collected by the ATLAS experiment at the Large Hadron Collider, using ttbar events with a tau lepton in the final state. The data are consistent with the background from Standard Model processes. Assuming branching ratio BR(H+ -> taunu) = 100%, this leads to upper limits on the branching fraction BR(t -> bH+).
        Speaker: Dr Aldo Saavedra (University of Sydney (AU))
        Slides
      • 15:00
        Search for the Higgs particle in models beyond the MSSM 15m
        Results are presented on the search for the non standard-model Higgs production and decays, beyond MSSM SUSY, including the production of a doubly charged Higgs boson decaying onto a pair of like sign charged leptons and a search for a low mass neutral a_0 decaying into a pair of muons. The full data sample of 4.7 fb-1 of pp collisions collected in 2011 with the CMS experiment at a CM energy of 7 TeV have been analyzed, as well as a significant fraction of the 2012 luminosity delivered so far at the new energy of 8 TeV.
        Speaker: Prof. James Olsen (Princeton University (US))
        Slides
      • 15:15
        Search for Neutral Supersymmetric Higgs Bosons in bbb(b) Final States in ppbar Collisions at sqrt(s)=1.96 TeV 15m
        We present a search for Higgs bosons in the bh(h-->bbar) and bbh(h-->bbar) channels at a center-of-mass energy of sqrt(s)=1.96 TeV with the D0 detector at the Fermilab Tevatron collider. In many Supersymmetric models the cross-section for production of neutral Higgs bosons in association with bottom quarks is greatly enhanced compared to the Standard Model, and over much of the parameter space the dominant decay mode is into a pair of bottom quarks. The search is performed in events with 3 and 4 identified b jets and uses the full D0 Run 2 dataset. Currently this search is only performed at the Tevatron and thus provides unique complementary information to searches for Supersymmetric Higgs bosons decaying into tau pairs at the LHC. The sophisticated techniques to model the dominant multijet background, as well as the multivariate techniques used to both efficiently select the signal and suppress the background, will be discussed in detail.
        Speaker: Dr Avto Kharchilava (State University of New York (US))
        Slides
      • 15:30
        Refreshment Break 30m
      • 16:00
        Search for Higgs Particles in MSSM SUSY 15m
        Results are presented on the search for MSSM SUSY Higgs production and decays, including a neutral Higgs decaying to a pair of tau leptons, and a charged Higgs decaying in tau neutrino. The full data sample of 4.7 fb-1 of pp collisions collected in 2011 with the CMS experiment at a CM energy of 7 TeV have been analyzed, as well as a significant fraction of the 2012 luminosity delivered so far at the new energy of 8 TeV.
        Speaker: Dr Christian Veelken (Ecole Polytechnique (FR))
        Slides
      • 16:15
        Search for the neutral MSSM Higgs bosons in the H->tautau and H->mumu decay modeswith the ATLAS detector at the LHC 15m
        The Minimal Supersymmetric extension of the Standard Model (MSSM) predicts the existence of three neutral and two charged Higgs bosons. The search for the neutral MSSM Higgs bosons in the H-> tau^+ tau^- and H->mu^+mu^- decay modes has been performed using proton-proton collision data recently collected with the ATLAS detector at the Large Hadron Collider. The exclusion limits at the 95% confidence level are discussed as a function of the mA and tan beta parameters .
        Speaker: Mr Sascha Ulrich Thoma (Albert-Ludwigs-Universität Freiburg (DE))
        Slides
      • 16:30
        Search for a fermiophobic Higgs particle 15m
        Vector boson fusion and associate production of Higgs bosons are searched for, with the Higgs decaying into vector bosons. The results are interpreted in a model for a fermiophobic Higgs. The full data sample of 4.7 fb-1 of pp collisions collected in 2011 with the CMS experiment at a CM energy of 7 TeV have been analyzed, as well a significant fraction of the 2012 luminosity delivered so far at the new energy of 8 TeV.
        Speaker: Dr Matteo Sani (University of California (US))
        Slides
      • 16:45
        Search for Light Higgs Bosons in \Upsilon(1S) and \Upsilon(2S) decays 15m
        A light $CP$-odd Higgs boson $(A^0)$ is predicted in some extensions of the Standard Model; such a particle would be evident in decays of the $\Upsilon(nS)$ resonance. Using a data sample of 102 million $\Upsilon(1S)$ events and 158 million $\Upsilon(2S)$ events collected by the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider, we search for light Higgs boson decays $A^0 \to \tau^+ \tau^-$ and $A^0 \to \mu^+ \mu^-$ in the processes $\Upsilon(1S)\to \gamma A^0$ and $\Upsilon(2S) \to \gamma A^0$.
        Speaker: Prof. Paoti Chang (National Taiwan University (TW))
        Slides
      • 17:00
        Search for light Higgs bosons in radiative Upsilon(1S) decays at BABAR 15m
        We search for a light CP-odd Higgs boson (A0) that arises in non-minimal supersymmetric extensions of the Standard Model and naturally couples strongly to bottom quarks. The search is conducted using radiative di-muon and di-tau decays of the Upsilon(1S) meson. We use BABAR’s large data sets of (92.8 +- 0.8) million Upsilon(2S) and (116.8 +- 1.0) million Upsilon(3S) decays to identify Upsilon(1S) production via the decay Upsilon(2S,3S) --> pi+pi- Upsilon(1S). This yields a high-purity sample with a Higgs-search sensitivity similar to that of radiative Upsilon(2S) and Upsilon(3S) decays. We set stringent limits on the product of branching ratios Br(Upsilon(1S) --> gamma A0) x B(A0 --> l+l-) where l = mu or tau, as well as on the effective coupling of the b-quark to the A0. Depending on the parameters of the model, the Higgs may decay predominantly into hadrons. We also present results of a search for a CP-odd Higgs boson produced in radiative Upsilon(2S) or Upsilon(3S) decays and decaying into hadrons. Our results severely restrict the available parameter space for models predicting light Higgs states.
        Speaker: Prof. Yury Kolomensky (UC Berkeley & LBNL (US))
        Slides
      • 17:15
        Light Higgs Scenario in BMSSM and LEP Precision Data 15m
        In this talk we consider very light Higgs fields in BMSSM(Beyond MSSM). The spectrum below TeV scale is the same as the MSSM but the Higgs potential is modified and is well described in terms of effective dimension five and six operators. A correction from the BMSSM operators allows us to consider new parameter space of Higgs sector which is not allowed in the MSSM. It can be regarded as a constrained version of general 2 Higgs doublet model (2HDM) as long as Higgs sector is concerned. We focus on the possibility that CP odd Higgs (A) mass is about 7 or 8 GeV and charged Higgs mass is comparable to W mass. At the same time one of the CP even Higgs (h) is light enough such that h and A production at the Z pole is kinematically allowed. The tension between forward backward asymmetry of bottom quark Ab_FB measured at LEP and the Standard Model prediction can be ameliorated if bottom quark pair produced from light CP even Higgs is taken into account.
        Speaker: Dr DOYOUN Kim (Monash University)
        Slides
      • 17:30
        . 30m
    • 09:00 18:00
      Room 216 - Top Quark Physics / Particle Astrophysics & Cosmology - TR4 & TR11 Room 216

      Room 216

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        Charge asymmetry in top pairs at ATLAS 15m
        In 7 TeV proton - proton collisions at the LHC, pairs of top and anti-top quarks are expected to be mostly produced through gluon fusion, in contrast to production at the Tevatron, where quark annihilation dominates. The ATLAS experiment has now recorded a large number of top quark pairs, allowing this domain to be explored in detail. We present measurements of top-quark charge asymmetry which constitute important tests of QCD and are sensitive to new physics. Measurements are presented in both, the single lepton and dilepton channel. Also, the lepton based charge asymmetry in top-quark pair events has been measured and will be presented.
        Speaker: Dr Mario Giordani (INFN Trieste (IT))
        Slides
      • 09:15
        Measurement of the charge asymmetry in top quark pair production in pp collisions (CMS) 15m
        A measurement is presented of the charge asymmetry in top-pair production in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV. The data are collected by the CMS experiment during the year 2011. The analysis uses events with one charged lepton and at least four jets. In order to measure the charge asymmetry in charge-symmetric initial state processes, the difference of absolute pseudo-rapidities of top and anti-top is used. The asymmetry is measured inclusively and differentially, as functions of the invariant mass, the rapidity and the transverse momentum of the ttbar system. The results are compared with various theory predictions, and discussed in the context of forward-backard asymmetry measurements at Tevatron.
        Speaker: Dr Thorsten Chwalek (KIT - Karlsruhe Institute of Technology (DE))
        Slides
      • 09:30
        Asymmetry measurements in t-tbar at CDF 15m
        The most intriguing property of top-quark physics observed so far is the forward-backward asymmetry in the production of top-quark pairs in proton anti-proton collisions at the Fermilab Tevatron. An unexpectedly sizable effect has observed in both the semi-leptonic and the all-leptonic decay channels of top-quark pairs, exceeding significantly the standard model predictions, and has motivated intensive theoretical investigations. Several models have already been proposed so far to explain the data, none of them fully successful. We present measurements of the asymmetry in both decay channels and studies of the asymmetry as a function of various kinematics variables, as well as related measurements of the top-quark pair production cross section differential in sensitive variables. We also present, for the first time, measurements of the asymmetry in bottom-quark pair production, which allows for exploring the asymmetry production mechanism in both the top and the bottom flavor sectors. All measurements are using the full CDF Run II sample.
        Speaker: Dr Chris Hays (University of Oxford (UK))
        Slides
      • 09:45
        Measurement of the forward-backward charge asymmetry in top quark pair production (D0) 15m
        We present measurements of the forward-backward asymmetry and the lepton charge asymmetry in lepton plus jets and dilepton final states in top antitop quark pair production in proton antiproton collisions, using up to 10 fb-1 of data collected by D0 in Run II. We present unfolded results corrected for acceptance and resolution effects. In case of the lepton plus jets channel the analysis is also performed as function of the invariant mass of the ttbar pair. Furthermore, we give the combination of both channels and present first distributions sensitive to the top quark polarization.
        Speaker: Dr Alexander Josef Grohsjean (DESY (DE) & Centre d'Etudes de Saclay (FR))
        Slides
      • 10:00
        Top quark forward-backward asymmetry from gauged flavor symmetry 17m
        The CDF and D0 experiments have reported measurements of the top quark forward-backward asymmetry A_{FB} which are (2.5-3.5) sigma away from the standard model predictions. In this talk it will be shown that this anomaly can be explained by new physics that arises when the flavor symmetry of the standard model is gauged in a maximal way. The flavor gauge symmetry would provide an understanding of the three family structure and the pattern of fermion masses. The Higgs doublets needed for generating the fermion masses contribute to A_{FB} in the right amount, while being consistent with all flavor changing constraints. The recent measurements of the top quark charge asymmetry A_C at the LHC by CMS and ATLAS provide additional constraints on these models. Interestingly, these constraints are compatible with models with extra Higgs doublets. Sharper predictions for A_C will be given, and the possibility of explaining an excess in the dijet invariant mass in the Wjj channel observed by CDF will be noted. New Higgs scalars in the mass range (150-400) GeV are predicted.
        Speaker: Prof. Kaladi S. Babu (Oklahoma State University (US))
        Slides
      • 10:17
        Refreshment Break 43m
      • 11:00
        Diagnosing top-quark Forward-Backward Asymmetry 15m
        Recent measurements on the top-quark forward-backward asymmetry (A_FB) by the two (CDF & D0) Tevatron experiments show a more than 3 sigma deviation from the Standard Model prediction from the SM expectation of 5.2 ± 0.6%. Later about 3.1sigma enhancement was established on the basis of considering top-pairs only from the large tt_bar invariant mass region. In this talk, we will discuss about the diagnostic tests performed by us for the the aforementioned observation and provide some detail on the nature of the correct BSM model that causes such a large deviation.
        Speaker: Dr Sudhir Kumar Gupta (Monash University (AU))
        Slides
      • 11:15
        Searches in s-channel single top quark production at ATLAS 15m
        We present searches for single top-quark production in the s-channel at 7 TeV proton-proton collisions with the ATLAS detector at the Large Hadron Collider. Limits. The result of a search for an exotic W’ boson production in the single top quark s-channel is also given.
        Speaker: Dr Barbara Alvarez Gonzalez (Michigan State University (US))
        Slides
      • 11:30
        FCNC in top quark production and decay at ATLAS 15m
        Results on the search for flavor-changing neutral-currents (FCNC) in top-quark production and decay are reported, with data collected with the ATLAS detector at a center-of-mass energy of sqrt(s) = 7 TeV. The single top quark topology is used to place limits on sigma(qg -> t) x B(t -> Wb) (q=u,c). A search is also performed for top-quark pair events, with one top quark decaying through the t->Zq FCNC channel, and the other through the Standard Model dominant mode t->Wb. An upper limit on the t->Zq is set.
        Speaker: Dr Markus Cristinziani (Universitaet Bonn (DE) & CERN)
        Slides
      • 11:45
        Search for FCNC in top pair events in pp collisions (CMS) 15m
        A search for flavor changing neutral currents in top quark decays is presented using a sample of top quark pair event candidates decaying via Wb and Zq into lνb and llq events. The search is performed at the CMS experiment at the LHC, using a data sample recorded in proton-proton collisions at a center-of-mass energy of 7 TeV. The observed number of events agrees with the standard model prediction, and no evidence of flavor changing neutral currents in top decays is found.
        Speaker: Dr Yuan Chao (National Taiwan University (TW))
        Slides
      • 12:00
        CP violation in top-quark physics 15m
        The LHC will produce large numbers of top anti-top quark pairs providing an excellent opportunity to study in detail the properties of the top-quark. We discuss the use of T-odd correlations to extract information on the CP violating couplings of the top-quark at the LHC. We illustrate our discussion with two examples: CP violating anomalous top quark couplings; and CP violation in extended Higgs sectors, including color octets.
        Speaker: Prof. German Valencia (Iowa State University (US))
        Slides
      • 12:15
        Search for a Narrow ttbar Resonance in ppbar Collisions at sqrt(s) = 1.96 TeV (Combined D0, CDF) 17m
        We report a search for a narrow ttbar resonance that decays into a lepton+jets final state based on an integrated luminosity of 5.3/fb of proton-antiproton collisions at sqrt(s)=1.96 TeV collected by the D0 Collaboration at the Fermilab Tevatron Collider. We set upper limits on the production cross section of such a resonance multiplied by its branching fraction to ttbar which we compare to predictions for a leptophobic topcolor Z' boson. We exclude such a resonance at the 95% confidence level for masses below 835 GeV.
        Speaker: Dr Azeddine Kasmi (Baylor University (US))
        Slides
      • 12:32
        Lunch Break 1h 28m
      • 14:00
        Measurement of the top pair invariant mass distribution and search for New Physics (CMS) 15m
        A measurement of the top-pair mass distribution in tt events is presented using proton-proton collision events at the LHC at a centre-of-mass energy of 7 TeV. The data are collected with the CMS experiment during the year 2011. The analysis is performed using several final states originating from top-pair production. The measurement is then used to search for massive resonances decaying into top-pairs. No significant deviations from the QCD expectations are observed, and upper limits on the new physics production cross-section as a function of the particle mass is determined
        Speaker: Prof. Freya Blekman (Inter-University Institute for High Energies (BE))
        Slides
      • 14:15
        Searches for ttbar resonances (ATLAS) 15m
        Several extensions of the Stand ard Model predict the presence of new particles that couple to the top quark. With the dataset of proton - proton collisions collected by the ATLAS detector at the Large Hadron Collider we present searches for reson ances decaying to top - quark pairs.
        Speaker: Dr Marcel Vos (Universidad de Valencia (ES))
        Slides
      • 14:30
        Z' signals in polarised top-antitop final states 15m
        We study the sensitivity of top-antitop samples produced at all energy stages of the Large Hadron Collider (LHC) to the nature of an underlying Z' boson, in presence of full tree level standard model (SM) background effects and relative interferences. We concentrate on differential mass spectra as well as both spatial and spin asymmetries thereby demonstrating that exploiting combinations of these observables will enable one to distinguish between sequential Z's and those pertaining to Left-Right symmetric models as well as E6 inspired ones, assuming realistic final state reconstruction efficiencies and error estimates. We go on to discuss other Z' models well suited to such searches in the top-anti top channel.
        Speaker: Mr Ken Mimasu (University of Southampton (UK))
        Slides
      • 14:45
        A charged Z' to explain the apparent disagreement in top-antitop asymmetires between Tevatron and LHC 15m
        We propose a phenomenological model with a flavour changing electrically-neutral but not self-conjugated Z' to simultaneously explain the large Tevatron ttbar forward-backward asymmetry and the compatible with zero LHC charge asymmetry. We find that the model produces a natural cancellation in pp collisions which is suppressed in Tevatron's ppbar collisions, leading to a large forward-backward asymmetry. Being not self-conjugated, the model is not affected by same-sign top pair production. We find the region in parameter space compatible with the mentioned observables in addition to the measured cross-sections. We propose easy distinctive features of the model which can be tested in differential charge asymmetry measurements.
        Speaker: Ms Estefania Coluccio Leskow (Buenos Aires University (AR))
        Slides
      • 15:00
        Top Decays with Flavor Changing Neutral Higgs Interactions at the LHC 15m
        We investigate the prospects for the discovery of a top quark decaying into one light Higgs boson along with a charm quark in top quark pair production at the CERN Large Hadron Collider (LHC). A general two Higgs doublet model is adopted to study the signature of flavor changing neutral Higgs interactions for $t \to c\phi^0$ or $\bar{t} \to \bar{c}\phi^0$ where $\phi^0$ is a CP-even scalar ($H^0$) or a CP-odd pseudoscalar ($A^0$). The dominant physics background is evaluated with realistic acceptance cuts as well as tagging and mistagging efficiencies. We have found abundant signal events and that our acceptance cuts reduce the physics background enough to establish a $5\sigma$ signal for $M_\phi \alt 130$ GeV at the early stage of LHC with $\sqrt{s} = 7$ TeV and an integrated luminosity of $10$ fb$^{-1}$. The discovery potential will be greatly enhanced with the full energy of $\sqrt{s} = 14$ TeV.
        Speaker: Prof. Chung Kao (University of Oklahoma (US))
        Slides
      • 15:15
        Search for anomalous Wtb couplings in ppbar collisions at sqrt(s) = 1.96 TeV (D0) 15m
        We present new direct constraints on a general Wtb interaction using data corresponding to an integrated luminosity of 5.4 fb-1 collected by the D0 detector at the Tevatron ppbar collider. The standard model provides a purely left-handed vector coupling at the Wtb vertex, while the most general, lowest dimension Lagrangian allows right-handed vector and left- or right-handed tensor couplings as well. We obtain precise limits on these anomalous couplings by comparing the data to the expectations from different assumptions on the Wtb coupling using information from electroweak single top quark production. We combine this with results studying the helicity of W bosons from top quark decays in ttbar events.
        Speaker: Prof. Kenneth Bloom (University of Nebraska-Lincoln (US))
        Slides
      • 15:30
        Refreshment Break 30m
      • 16:00
        The Dark Energy Survey: status and science prospects 15m
        The Dark Energy Survey Collaboration will soon begin a 5000 sq. deg. imaging survey of the southern galactic cap using a new 3 sq. deg., 520 Megapixel CCD camera, the Dark Energy Camera (DECam), with 5 filters (g,r,i,z and Y) mounted on the Blanco 4-meter telescope at the Cerro-Tololo Inter-American Observatory. Construction of DECam is complete, and installation and commissioning on the telescope are taking place in spring and summer 2012, with the expectation that the survey will begin in fall 2012. The survey data will be used to place new and tight constraints on the nature of dark energy via the history of the cosmic expansion rate and the growth of large-scale structure, using the four complementary techniques recommended by the Dark Energy Task Force: weak gravitational lensing, galaxy cluster counts, large-scale structure including baryon acoustic oscillations, and Type Ia supernovae. The science projections and prospects will be described, together with the status of the DECam installation and commissioning.
        Speaker: Dr Marcelle Soares-Santos (Fermi National Accelerator Laboratory (US))
        Slides
      • 16:15
        Cosmological neutrino mass constraint from the WiggleZ Dark Energy Survey 15m
        The absolute neutrino mass scale is currently unknown, but can be constrained from cosmology. We use the large-scale structure information from the WiggleZ Dark Energy Survey to constrain the sum of neutrino masses. The WiggleZ high redshift star-forming blue galaxy sample is less sensitive to systematic effects from non-linear structure formation, pairwise galaxy velocities, redshift-space distortions, and galaxy bias than previous surveys. Through exhaustive tests using numerical dark-matter simulations of the WiggleZ survey, we demonstrate the at small scales common modelling approaches lead to systematic errors in the recovered cosmological parameters, and we use the simulations to calibrate a new non-linear fitting formula extending to small scales (k=0.3h/Mpc). We obtain an upper limit on the sum of neutrino masses of 0.60eV (95% confidence) for WiggleZ+Wilkinson Microwave Anisotropy Probe. Combining with priors on the Hubble Parameter and the baryon acoustic oscillation scale gives an upper limit of 0.29eV, which is the strongest neutrino mass constraint derived from spectroscopic galaxy redshift surveys.
        Speaker: Dr Signe Riemer-Sorensen (University of Queensland)
        Backup pdf slides
        Paper
        Slides
      • 16:30
        Probing Flavor Transition Mechanisms with High Energy Astrophysical Neutrinos 15m
        The determination of neutrino flavor transition mechanisms by neutrino telescopes is discussed. We parametrize these mechanisms in a basis which is very convenient for classifying flavor transition models.At very high energies (>10PeV), It is investigated that the electron neutrino fraction can be extracted without identifying muon and tau neutrinos by the neutrino telescope, such as ARA. We demonstrate how this observation, the electron neutrino fraction at very high energies, can probe the flavor transition mechanism.
        Speaker: Prof. Kwang-Chang Lai (Chang Gung University (TW))
        Slides
      • 16:45
        Latest Results on Searches for Dark Matter from IceCube 15m
        Construction of the IceCube neutrino observatory was completed in early 2011, including a low-energy in-fill extension. This DeepCore sub-detector offers exciting opportunities for neutrino physics in the energy range of 10 GeV to 1 TeV. IceCube searches indirectly for dark matter via neutrinos from dark matter self-annihilations and has a high discovery potential through striking signatures. We report on the latest results from searches for dark matter self-annihilations in the Milky Way and nearby Galaxy clusters, as well as the search for signals from the Sun and Earth. Furthermore, a formalism for quickly and directly comparing event-level IceCube data with arbitrary annihilation spectra in detailed model scans, considering not only total event counts, but also event directions and energy estimators is presented. We show an application of this formalism to both model exclusion and parameter estimation in models of supersymmetry.
        Speaker: Mr Matthias Danninger (Stockholm University (SE))
        Slides
      • 17:00
        Dark matter searches with the ANTARES neutrino telescope: constraints to CMSSM and mUED models 15m
        ANTARES is the largest neutrino telescope Northern hemisphere. It consists of a three-dimensional array of 885 photomultipliers to collect the Cherenkov light induced by relativistic muons produced in CC interactions of high energy neutrinos. One of the main scientific goals of the experiment is the search for dark matter. We present here the analysis of the recently unblinded data taken during 2007 and 2008 to look for a WIMP signal in the Sun. WIMPs are one of the most popular scenarios to explain the dark matter content of the Universe. They would accumulate in massive objects like the Sun or the Galactic Center and their self-annihilation would produce (directly or indirectly) high energy neutrinos detectable by neutrino telescopes. Contrary to other indirect searches (like with gamma rays or positrons), the search for neutrinos in the Sun is free from other astrophysical contributions, so the explanation of a potential signal in terms of dark matter is much more robust. The results are interpreted within two theoretical frameworks: CMSSM and mUED. Dark matter searches with neutrino telescopes has specific advantages with respect to other indirect searches. On the other hand, neutrino telescopes are particularly sensitive to spin-dependent cross-section, in contrast to direct search experiments. In particular, a potential signal from the Sun would can safely be interpreted as dark matter, contrary to excesses observed in cosmic rays or gamma rays, since there is no likely astrophysical alternative. We will present the results of the search for WIMPs in the Sun, using the recently unblinded data of 2007-2008. These results include limits in the muon and neutrino flux and also limits in the spin dependent cross section in the CMSSM and mUED frameworks. Moreover, an overview of the capabilities of other on-going analysis (Galactic Center, Sun with 2007-2011 data) will be also presented.
        Speaker: Dr Juan de Dios Zornoza Gomez (IFIC (ES))
        Slides
      • 17:15
        The status of KIMS experiment 15m
        KIMS (Korea Invisible Mass Search) experiment has run its 100kg setup for last three years. We have given a new WIMP interaction rates for spin-independent and spin-dependent limits with 24524 kgdays data. We have further analyzed for the annual modulation amplitude with the last 3 years data. An analysis will be presented which has a limit comparable to DAMA's modulation amplitude. We have recently studied in detail and identified for the major internal and external background sources. Perspectives for KIMS experiment will be presented.
        Speaker: Prof. Yeongduk Kim (Sejong University (KR))
        Slides
      • 17:30
        Direct Search for Dark Matter with the LUX Experiment 15m
        The Large Underground Xenon (LUX) experiment consists of a two-phase xenon time projection chamber, which is being deployed at a depth of 4850 feet in the Homestake mine in Lead, South Dakota. When LUX begins operation in Fall 2012 it will be the world’s most sensitive dark matter detector, with a fiducial target mass of 100 kg. Results from a surface lab commissioning and calibration run of LUX will be presented. Comparisons will be made to a detailed detector simulation, which is novel for such a class of detectors. Expected sensitivity and physics reach for detecting WIMP dark matter will be discussed, and compared to other contemporary direct search experiments. Plans for an order of magnitude larger detector will be outlined.
        Speaker: Dr Karen Gibson (Case Western Reserve University (US))
        Slides
      • 17:45
        Prospects of direct dark matter detection with DarkSide experiment 15m
        DarkSide represents a staged program for direct detection of dark matter utilizing two-phase argon time projection chamber with the goal of achieving a high sensitivity limit or convincing detection of dark matter. The first stage in the program is DarkSide-10, a 10 kg prototype detector that was running in Laboratori Nazionali del Gran Sasso Counting Test Facility (CTF) during summer of 2011. The prototype was used to test argon light yield and other features necessary to achieve high sensitivity in the physics detector. The DarkSide-10 will be followed DarkSide-50 detector featuring a 50 kg active mass depleted argon target that is designed to reach sensitivity of 10^-45 cm^2 and will also be deployed in CTF. Besides the use of depleted argon that will allow use of pulse shape discrimination, other unique features such as neutron veto and muon veto along with active detector calibration will result in a detector capable of achieving background-free conditions. Construction of the neutron veto has been finished and DarkSide-50 is expected to start taking data in the Fall of 2012. The third stage of the program is DarkSide-G2, a second generation detector with 5 ton active mass of liquid argon reaching 10^-47 cm^2 sensitivity level, currently going into an R&D phase. In my talk, I will present DarkSide program, R&D activities and steps toward high sensitivity background-free measurement.
        Speaker: Dr Jelena Maricic (Drexel University (US))
        Slides
    • 09:00 18:00
      Room 217 - Heavy Ion Collisions / B-Physics / CP Violation - TR5/7/9 Room 217

      Room 217

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        Measurement of boson production in lead-lead collisions at sqrt(s_NN)=2.76 TeV with the ATLAS detector 15m
        Direct production of bosons are a powerful tool in heavy ion collisions. Their rates provide access to the initial state parton distribution functions, which are expected to be modified by nuclear effects.  They also provide a means to calibrate the expected energy of jets that are produced in the medium, and thus are a tool to probe the physics of jet quenching more precisely both through jet rates and fragmentation properties.  The ATLAS detector measures photons and Z->ee decays with its hermetic, longitudinally segmented calorimeter, which has excellent spatial and energy resolution, providing detailed information about the shower shape of each measured photon. ATLAS also measures the Z->mumu and W->munu in the same pseudorapidy range using the its muon system.  First results on the rates of isolated direct, Z and W from approximately 140 µb-1 of lead-lead data will be shown, as a function of transverse momentum, pseudorapidity and centrality, and their rates compared to expectations from perturbative QCD.
        Speaker: Prof. Max Klein (University of Liverpool (UK))
        Slides
      • 09:15
        Measurements of Jets and Jet Properties in sqrt(s_NN)=2.76 TeV PbPb Collisions with the ATLAS Detector at the LHC 15m
        Jet quenching in the hot and dense medium created in ultra-relativistic heavy ion collisions is a well-established experimental phenomenon at RHIC. It has long been anticipated that the LHC heavy ion program would substantially advance the study of jet quenching by providing access to highly energetic jets and by measuring fully-reconstructed jets. Immediately following turn-on of the LHC in November, 2010, that expectation was fulfilled through the observation of large di-jet asymmetries that may indicate substantial jet quenching. In this talk we will present recent results from ATLAS aimed to provide further understanding of this phenomenon. Measurements of single jet production, di-jet correlations and jet fragmentation in Pb+Pb collisions at $\sqrt{s_{NN} = 2.76$~TeV will be presented. In addition to measurements from the 2010 data, results using the full 2011 run will also be presented, benefiting from a factor of 20 improvement in statistics.
        Speaker: Prof. Erez Etzion (Tel Aviv University (IL) & CERN (CH))
        Slides
      • 09:30
        J/Psi and Upsilon production in proton-nucleus collisions: lessons from RHIC for the 2012 proton-lead LHC run 15m
        We will discuss the nuclear-matter effects on J/Psi and Upsilon production at RHIC and the LHC in proton-nucleus and, by extension, in nucleus-nucleus collisions. In the Upsilon case, we will argue that (i) the Upsilon break-up probability can be neglected in a first approximation, (ii) the gluon shadowing and antishadowing are not strong enough to describe forward RHIC data, (iii) the backward data hints at a gluon EMC effect, possibly stronger than the quark one, (iv) fractional energy loss provides a very convincing explanation for the Upsilon suppression seen by PHENIX in the forward region. Following these discussions, predictions for the LHC pPb run will be presented. In the J/Psi case, we will show that the fractional energy loss needed to explain the forward Upsilon suppression provides an alternative explanation to a strong gluon saturation for the strong forward J/Psi suppression at RHIC. We will discuss how this also affects J/Psi production in pA collisions at LHC energies. We will present results for J/Psi production in dAu at RHIC as function of rapidity, centrality and transverse momentum as well as for pA and AA collisions at the LHC. We will also pay special attention to two potential experimental issues in the interpretation of the LHC data, namely the absence of pp measurements at the same energy as for pPb and the difference in the transverse-momentum region accessed by the different detectors, i.e. ALICE vs. CMS and ATLAS.
        Speakers: Dr Jean-Philippe Lansberg (Institut de Physique Nucléaire d'Orsay / IN2P3-CNRS (FR)), Jean-Philippe Lansberg (IPN Orsay, Paris Sud U. / IN2P3-CNRS), Jean-Philippe Lansberg (Ecole polytechnique), Jean-Philippe Lansberg (Ecole Polytechnique)
        Slides
      • 09:45
        Suppression of high-pt heavy-flavour particles in Pb-Pb collisions at the LHC, measured with the ALICE detector 15m
        The ALICE experiment studies nucleus-nucleus collisions at the LHC in order to investigate the properties of QCD matter at extreme energy densities. The measurement of open charm and open beauty production allows to probe the mechanisms of heavy-quark propagation, energy loss and hadronization in the hot and dense medium formed in high-energy nucleus-nucleus collisions. In particular, in-medium energy loss is predicted to be different for massless partons (light quarks and gluons) and heavy quarks at moderate momentum. The ALICE apparatus allows us to measure open heavy-flavour particles in several decay channels and with a wide phase-space coverage. We present the results on the nuclear modification factors for heavy flavour particle production in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV. Using proton-proton and lead-lead collision samples at sqrt(s) =2.76 and 7 TeV and at sqrt(s_NN) = 2.76 TeV, respectively, nuclear modification factors R_AA(pt) were measured for D mesons at central rapidity (via displaced decay vertex reconstruction), and for electrons and muons from heavy flavour decays, at central and forward rapidity, respectively. The large suppression observed in the high pt region, by a factor 2.5-4 in central Pb-Pb collisions with respect to the pp reference, indicates a strong in-medium energy loss of heavy quarks.
        Speaker: Dr Andrea Dainese (INFN Padova (IT))
        Slides
      • 10:00
        Quarkonia production in 2.76 TeV PbPb collisions in CMS 15m
        The Compact Muon Solenoid (CMS) is fully equipped to measure hard probes in the di-muon decay channel in the high multiplicity environment of nucleus-nucleus collisions. Such probes are especially relevant for studying the quark-gluon plasma since they are produced at early times and propagate through the medium, mapping its evolution. CMS has measured the nuclear modification factors of non-prompt J/psi (from b-hadron decays), prompt J/psi, and Y(1S) in PbPb collisions at $\sqrt{s_{NN}} = 2.76$ TeV. Suppression of the excited Y-states is also studied in comparison to the Y(1S) state.
        Speaker: Dr Nuno Viegas Guerreiro Leonardo (Purdue University (US))
        Slides
      • 10:15
        Dijet imbalance in 2.76 TeV PbPb collisions in CMS 15m
        Jet production in PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV is studied with the CMS detector at the LHC. Jets are reconstructed using the energy deposited in the CMS calorimeters. A large dijet imbalance is observed in central PbPb collisions, which reduces in the more peripheral collisions. This observation is consistent with a jet quenching scenario, where the parton loose energy propagating through the hot and dense QCD medium. Detailed studies of the jet properties and jet-hadron correlations will be presented.
        Speaker: Dr David Krofcheck (University of Auckland (NZ))
        Slides
      • 10:30
        Refreshment Break 30m
      • 11:00
        Measurement of harmonic flow and particle correlations in lead-lead collisions at sqrt(s_NN)=2.76 TeV from ATLAS 15m
        This talk will present the results of the azimuthal anisotropy of charged particle production and two particle correlations  in Pb + Pb collisions measured with the ATLAS experiment. The results are obtained with multi-particle correlations and compared with the event plane method. A complete set of v_n harmonics measured from central to peripheral events covers a pseudo-rapidity range of |eta| < 2.5 and a transverse momentum range 0.5 < p_T < 20 GeV. A comparison of the event plane and particle correlation methods allow to uniquely evaluate non-flow effects as well as the size of flow fluctuations. The v_1 flow and scaling of integrated elliptic flow, down to very low-p_T, will be discussed and compared to results of lower energy experiments.
        Speaker: Prof. Ehud Duchovni (Weizmann Institute of Science (IL))
        Slides
      • 11:15
        DIPSY - a new generator for minimum bias and heavy ion collisions 15m
        We present a new Monte Carlo event generator based on the Mueller dipole model. The model is equivalent to leading logarithmic BFKL evolution and in our implementation we include several non-leading effects, such as energy-momentum conservation and a so-called swing mechanism to model saturation effects. In the end we can model all kinds of correlations and fluctuations between partons in the initial-state cascade and by adding final-state parton showers and string hadronization we can produce exclusive hadronic final states. So far the program has given promising results for minimum-bias events in proton collisions, but the main application may be for heavy ion collisions. Here we can again model kinds of correlations and fluctuations not only between partons in individual, but also between partons in different nucleons. This can then be used as the initial state of a hydrodynamical evolution model to better understand how observables are affected by initial-state effects. Alternatively it can be used as in proton collision with parton showers and hadronization to realistically model what heavy-ion collisions would look like in the absence of collective final-state effects.
        Speaker: Prof. Leif Ingvar Lönnblad (Lund University (SE))
        Slides
      • 11:30
        Particle production in Pb-Pb collisions with the ALICE experiment at LHC 15m
        The ALICE experiment can benefit from its excellent particle identification capabilities to study hadron production in Pb-Pb collisions at \sqrt(s_NN) = 2.76 TeV, over a wide range of momenta. This allows one to probe different stages of the medium evolution. Transverse momentum spectra of identified particle and resonances characterize the bulk freeze-out properties and the dynamical evolution of the system. Results from hydrodynamics-motivated blast-wave model fits to the data are shown, while production yields and ratios are discussed from a thermodynamical point of view. Since the colliding nuclei have no net strangeness content, the study of strange and multi-strange particle production is an important probe of the early partonic stages of the collision. The enhancement of strangeness production in relativistic heavy-ion collisions relative to proton-induced reactions was one of the predicted signatures of the formation of the deconfined medium known as Quark-Gluon Plasma. ALICE results are presented. Moreover, high-pT particle production can be used to investigate the energy loss of the fast partons produced in early hard scatterings, while traversing the medium. To this purpose, measurements of the nuclear modification factor (R_AA) of identified particles have been performed and are discussed. Pb-Pb results are finally compared to measurements at lower energies and predictions for the LHC.
        Speaker: Ms Francesca Bellini (Universita e INFN & University of Bologna (IT))
        Slides
      • 11:45
        Collective flow and charged hadron correlations in 2.76 TeV PbPb collisions at CMS 15m
        We report on the CMS measurements of charged hadron anisotropic azimuthal distributions from PbPb collisions at sqrt{s_{NN}} = 2.76 TeV. The results are presented as a function of transverse momentum, centrality and pseudorapidity and cover a broad kinematic range. Long range in pseudorapidity di-hadron azimuthal correlations are also studied and discussed in terms of the possible influence of the initial collision geomety. These results can provide constraints on the theoretical description of the early dynamics in the hot and dense medium created at the LHC and the transport properties through this medium.
        Speaker: Dr Sandra Padula (UNESP - Universidade Estadual Paulista (BR))
        Slides
      • 12:00
        Anisotropic Flow of Charged Particles at High Transverse Momentum in 2.76 TeV Pb-Pb Collisions at the LHC from ALICE experiment 15m
        Anisotropic flow is sensitive to the properties of the deconfined state of matter produced during the course of a heavy-ion collision. We report on the inclusive photons anisotropic flow at forward rapidity, 2.3 < eta < 3.9, measured for Pb-Pb collisions at 2.76 TeV with ALICE at the LHC. Photons are reconstructed with ALICE Photon Multiplicity Detector (PMD), and the collision symmetry plane is estimated with charged particles produced at midrapidity |eta| < 0.8, which introduce large rapidity gap to reduce non-flow effects in the correlation analysis.
        Speaker: Ms Anitha Nyatha (Indian Institute of Technology Bombay (IN))
        Slides
      • 12:15
        Flow of strange and charm particles in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV measured with ALICE 15m
        The ALICE experiment studies Pb-Pb collisions at the LHC in order to investigate the properties of the hot and dense QCD matter at extreme energy densities. Recent results from ALICE in identified particle flow allow for the exploration of the collective properties of the medium created in heavy-ion collisions. Due to their difference in mass, the strange and charm quarks are expected to couple differently to the system in the deconfined phase. In this talk, special attention is given to strange and charm particles which probe the medium differently and thus provide new constraints for the study of its properties. The talk will cover results on elliptic flow for K$^{+}$, K$^{0}_{s}$, $\Lambda$, $\Xi$, $\Omega$, $\Phi$, D$^{0}$ and D$^{*+}$ measured at midrapidity by ALICE in Pb-Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV. The comparison with available models will also be shown.
        Speaker: Mr Carlos Eugenio Perez Lara (NIKHEF (NL))
        Slides
      • 12:30
        Scientific Program of NICA @ JINR 15m
        Scientific program of NICA (Nuclotron-based Ion Collider fAcility) is now under realization phase at JINR (Dubna). The main goal of the program is an experimental study of hot and dense strongly interacting matter in heavy ion collisions at centre-of-mass energies of √sNN = 4-11 GeV (NN-equivalent) and at average luminosity of 10E27 cm-2 s-1 for Au (79+) in the collider mode (NICA collider). In parallel, fixed target experiments at the upgraded JINR superconducting synchrotron Nuclotron are carried out in the extracted beams of various nuclei species up to Au (79+) with maximum momenta of 13 GeV/c (for protons). The program also foresees a study of spin physics with extracted and colliding beams of polarized deuterons and protons at the energies up to √s = 26 GeV (for protons). The proposed program allows to search for possible signs of the mixed phase and critical endpoint, and to shed more light on the problem of nucleon spin structure. General design and construction status of the complex is presented.
        Speaker: Prof. Vladimir Kekelidze (Joint Institute for Nuclear Research (RU))
        Slides
      • 12:45
        Recent results and future plans form the NA61/SHINE experiment 15m
        The NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) is a fixed-target experiment to study hadron production in hadron-nucleus and nucleus-nucleus collisions at the CERN SPS. The experimental apparatus is a large acceptance Magnetic Spectrometer complemented with Time-Of-Flight detectors and a Projectile Spectator Detector. Its excellent capability for particle identification and momentum determination, even in complex events, makes the NA61/SHINE experiment well suited for pursuing a reach physics program which consists of three main topics: i) hadron-nucleus interactions: hadron production measurements for neutrino (T2K) and cosmic-ray (Pierre Auger Observatory) experiments ii) nucleus-nucleus interactions: hadron production measurements to search for the critical point of strongly interacting matter and to study the properties of the onset of the deconfinement iii) proton-proton and proton-nucleus interactions: measurement of inclusive and correlated yields of high pT hadrons to study their in-medium modifications i) Second generation long baseline neutrino oscillation experiments, like T2K, do require a very good knowledge of neutrino fluxes which means a more precise measurements of the production cross sections of pions and kaons. NA61/SHINE thanks to the large acceptance and particle identification in the forward region covers most of the phase space region of interest for T2K. So far pi+ and K+ differential cross section in p+C interaction at 31 GeV/c have been measured and published. Such measurements contributed significantly to the T2K measurement of electron neutrino appearance (nu_mu->nu_e) which led to the first indication of a non zero mixing angle theta_13 and to the measurement of muon neutrino disappearance (nu_mu->nu_mu). Preliminary results on K0_S production have been released as well. Precise knowledge of the neutral kaons cross section is in fact required for the accurate calculation of the nu_e and nu_e fluxes from K0_L->pi e nu_e decays. Measured charged pions and kaons data provide also important input to improve hadron production models prediction needed for the study of air shower initiated by ultra-high-energy cosmic particles. ii) and iii) NA61/SHINE aims to extend the NA49 ion program exploring a wider region of the phase diagram of strongly interacting matter within the range of thermodynamical variables (e.g. temperature and baryon chemical potential). Profiting from the successful increase in the data taking rate after the detector upgrade, NA61/SHINE is performing a scan the QCD phase diagram by varying both the energy (beam momentum 13A-158A GeV/c) and the size of the colliding nuclear system (p+p, p+Pb, Be+Be, Ar+Ca, Xe+La). The main goal is to find signatures of the critical point and to study the onset of the QGP formation by measuring the dynamical fluctuations, the azimuthal anisotropy and the identified hadron spectra and yields. Moreover, high statistics data will make possible the measurement of high pT hadron spectra. Successful data taking for p+p (13 to 158 GeV/c) and of Be+Be (40A, 75A and 150A GeV/c) interactions have been completed. From the analysis of p+p data at 20A, 31A, 40A, 80A and 158A GeV/c preliminary results are available on the energy dependence of the inclusive pion production, the transverse momentum fluctuations and the azimuthal angle fluctuations. All the achieved results and the analysis techniques will be described in detail with particular emphasis on the impact on the related physics measurements. Future data taking plans and the foreseen program of measurements will be presented as well.
        Speaker: Dr Silvestro Di Luise (Eidgenoessische Tech. Hochschule Zürich (CH))
        Slides
      • 13:00
        Electron-Ion Collisions at a Large Hadron electron Collider (LHeC Study Group) 15m
        The Large Hadron electron Collider (LHeC) is a proposed facility which will exploit the LHC heavy ion beam for electron-nucleus scattering, using a new 60 GeV electron accelerator. This contribution, which is derived from the detailed simulations in the recently released Conceptual Design report, addresses the expected physics impact of the LHeC for heavy ion physics and nuclear parton density determinations. The kinematic coverage extends beyond previous deep inelastic lepton-ion experiments by nearly four orders of magnitude at low Bjorken x (from x ~ 10^-2 to x~ 10^-6) and is expected to be sufficient to reveal the non-linear dynamics which tame the low x growth of parton densities. The inclusive electron-lead cross section, as well as exclusive and diffractive channels, are explored as means of probing this new region of very high parton densities.
        Speaker: Prof. Paul Newman (University of Birmingham (UK))
        Slides
      • 13:15
        Lunch Break 30m
      • 13:45
        Prospects of measuring the CKM matrix element $V_{ts}$ at the LHC 15m
        We study the prospects of measuring the CKM matrix element $\vert V_{ts}\vert$ at the LHC with the top quarks produced in the processes $p p \to t\bar{t}X$ and $p p \to t/\bar{t} X$, and the subsequent decays $t \to W^+s$ and $\bar{t} \to W^- \bar{s}$. To reduce the jet activity in top quark decays, we insist on tagging the $W^\pm$ leptonically, $W^\pm \to \ell^\pm \nu_\ell$ ($\ell =e, \mu, \tau$), and analyse the anticipated jet profiles in the signal process $t \to W s$ and the dominant background from the decay $t \to W b$. To that end, we analyse the $V0$ ($K^0$ and $\Lambda$) distributions in the $s$- and $b$-quark jets concentrating on the energy and transverse momentum distributions of these particles. The $V0$s emanating from the $t \to W b$ branch have displaced decay vertexes from the interaction point due to the weak decays $b \to c \to s$ and the $b$-quark jets are rich in charged leptons. Hence, the absence of secondary vertexes and of the energetic charged leptons in the jet provide additional ($b$-jet vs. $s$-jet) discrimination in top quark decays. These distributions are used to train a boosted decision tree (BDT), a technique used successfully in measuring the CKM matrix element $\vert V_{tb}\vert$ in single top production at the Tevatron. Using the BDT classifier, and a variant of it called BDTD, which makes use of decorrelated variables, we calculate the BDT(D)-response functions corresponding to the signal ($t \to W s$) and background ($t \to W b$). Detailed simulations undertaken by us with the Monte Carlo generator PYTHIA are used to estimate the background rejection versus signal efficiency for three representative LHC energies $\sqrt{s}=7$ TeV, 10 TeV and 14 TeV, of which only the analysis for the $\sqrt{s}=14$ TeV case is shown in detail. We argue that a benchmark with 10\% accuracy for the signal $t \to W s $) at a background ($t \to W b$ ) rejection by a factor $10^3$ (required due to the anticipated value of the ratio $\vert V_{ts}\vert^2/\vert V_{tb} \vert^2 \simeq 1.6 \times 10^{-3}$) can be achieved at the LHC@14 TeV with an integrated luminosity of 10 fb$^{-1}$.
        Speaker: Prof. Fernando Barreiro (Universidad Autonoma De Madrid (ES))
        Slides
      • 14:00
        b ->sgamma and b -> s l+ l- at BaBar 15m
        The inclusive decay b-->s gamma, which in the standard model proceeds via the electroweak penguin process, is sensitive to contributions from physics beyond the standard model. Extensive theoretical literature discusses the contributions of new physics to the decay rate and CP asymmetry. While predictions for the exclusive decays such as B-->K* gamma suffer from large hadronic uncertainties associated with form factors of the final-state hadrons, the inclusive decays are theoretically better understood, with partonic rates calculated to a precision of a few percent. We present new results of the inclusive decay b-->s gamma using both a fully inclusive technique and the sum of 38 exclusive modes. In both techniques we take advantage of the clean e+e- environment. We report the branching fraction, CP asymmetry, and photon energy spectrum for these decays. In the standard model, the flavor-changing-neutral-current decays b-->d l+l- are suppressed by the electromagnetic coupling relative to the decay b-->d gamma and Cabibbo suppressed with respect to the decays b-->sl+l-. Being very rare and proceeding via an electroweak penguin or box diagram, these decays are sensitive probes of new physics, which may significantly increase the branching fraction. Using the full BABAR data set, we study the decays B+ -->pi+ l+l-, B0 -->pi0 l+l-, and B0 -->eta l+l-, where l=e or mu. We present updated branching-fraction upper limits for the individual pion modes and for the combined B-->pi l+l- decay. We also present the first upper limit on the branching fraction of the decay B0 -->eta l+l-. We study the rare decays B-->K(*)e+e- and B-->K(*)mu+mu- in a sample of 471 million BB events collected with the BABAR detector. We report measurements of the partial branching fractions, isospin asymmetry, K* polarization, and lepton forward-backward asymmetry in seven bins of dilepton mass squared. We also present the CP and lepton-flavor asymmetries for dilepton mass below and above the J/Psi resonance. Our results are compared with the standard-model predictions and those of other experiments. The inclusive, flavor-changing-neutral-current decay b-->sl+l- provides a probe of new physics and stringent tests of the standard model, as it is theoretically better understood than individual exclusive decays. We present new measurements of the inclusive decay B --> Xs l+ l-, where Xs is a hadronic system consisting of one charged or neutral K and 0-3 pions with at most one pi0, and l is an electron or muon. The measurement is based on the full BABAR Upsilon(4S) data set. We report the total branching fraction, partial branching fractions and CP asymmetries in five regions of dilepton mass using a sum-of-exclusive-modes technique.
        Speaker: Prof. Gerald Eigen (University of Bergen (NO))
      • 14:15
        A global fit to extract the B->Xs gamma decay rate 15m
        The measurements of the total B->Xs gamma decay rate and the determination of the CKM matrix element |Vub| play important roles in looking for new physics in the flavor sector of the Standard Model, complementary to the ongoing direct searches at the LHC. Their measurements from present and future B-factory data require the precise knowledge of the nonperturbative parts of the parton distribution function for the b quark in the B-meson (called the shape function). We present the state of the art theory and a global fit to BaBar and Belle data to extract the shape function and the B->Xs gamma decay rate using a model-independent framework with reliable theoretical uncertainties for the shape function, based on an expansion in a set of basis functions.
        Speaker: Mr Florian Bernlochner (University of Victoria (CA))
        Slides
      • 14:30
        Radiative B decays at LHCb 15m
        Radiative B decays are sensitive probes of New Physics. We present the first results on these decays from the LHCb experiment, which are obtained with 1.0 fb-1 of proton-proton collision data collected in 2011. Results include the measurements of the branching fraction of B0s -> φ γ and the CP asymmetry in B0 -> K*0 γ.
        Speaker: Dr Olivier Deschamps (Laboratoire De Physique Corpusculaire (FR))
        Slides
      • 14:45
        Rare or forbidden B decays at Belle 15m
        The quark transition $b \rightarrow s \nu\bar{\nu}$ is only possible within the Standard Model (SM) through higher order processes, which are highly suppressed compared to tree-level processes. The theoretical predictions of the decays where this quark process occurs are very precise because there is only one hadron in the final state and no charged lepton. However, in models beyond the Standard Model, these decays can be enhanced by orders of magnitude. The very small SM branching fractions and two undetectable neutrinos in the final state are the main challenges of this analysis. To be able to reconstruct these channels despite the missing neutrinos, the full reconstruction method is used. We present the results of the search for $B \rightarrow h^{(*)}\nu\bar{\nu}$ decays based on the full data set collected at the $\Upsilon(4S)$ resonance with the Belle detector operating at the KEKB asymmetric-energy $e^+e^-$ collider. We report on a search for heavy neutral leptons in $B$-meson decays. The results are obtained using a data sample that contains $772 \times 10^6\,B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. No signal is observed and upper limits are set on mixing of heavy neutral leptons with left-handed neutrino of the SM in the mass range $0.5-5.0\,\textrm{GeV}/c^2$. We report a search for $B$ decays into invisible final states using a data sample of 656.7 million $B\overline{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. The signals of invisible final states are identified by fully reconstructing the accompanying $B$ meson and requiring no other charged particles and no extra energy deposited in the calorimeter. The measured upper limits are reported and the corresponding physics are discussed. The HyperCP experiment at Fermilab reported the observation of three events for $\Sigma^+ \to p \mu^+ \mu^-$ decay. The dimuon masses of the observed events are clustered around $214.3 {\rm MeV}/c^2$ within the detector resolution of $1 {\rm MeV}/c^2$. These decays might be interpreted as a two-body decay, $\Sigma^+ \to p X^0(214)$, with $X^0 (214) \to \mu^+ \mu^-$. Several hypotheses are suggested to interpret $X^0 (214)$ including a sgoldstino in SUSY, a light Higgs boson in NMSSM, and a $U$ boson. We report on a search for $X^0$ in $B^0 \to K^+ (\pi^+) \pi^- X^0$ decays using 772 million $B$ meson pairs collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We extend the search to a larger mass region between $212 {\rm MeV}/c^2$ and $1.8 {\rm GeV}/c^2$ with different values of the $X^0$ lifetime. We study the charmless $B^0$ decays with final state particles $p \bar{\Lambda} \pi^- \gamma$ using the full data sample collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. This decay is believed to proceed via the $b \to s \gamma$ electro-weak penguin process at the quark level. We also search for the intermediate three-body decays using the same final state particles. Observed branching fractions or upper limits are reported. We present a study of B decays to $K^{(*)}$ and two leptons ($e,\ \mu$) in the full Belle $\Upsilon (4S)$ data set containing $771 \times 10^6~B\bar{B}$ pairs. The flavor-changing neutral-current process responsible for this decay, $b \rightarrow s \ell^{+} \ell^{-}$, proceeds via electro-weak penguin diagrams in the Standard Model. However, this process is sensitive to new physics due to contributions from Beyond the Standard Model particles in these diagrams. We report the differential branching fraction, isospin asymmetry, $K^{*}$ polarization, and forward-backward asymmetry ($A_{FB}$) as a function of $q^2 = M_{\ell\ell}^{2} c^2$. The flavor-changing-neutral-current decays such as $B \to X_s \gamma$ are sensitive to new physics beyond the Standard Model as particles of new physics may enter the loop and affect the decay process. While the branching fraction of the inclusive $B \to X_s \gamma$ decays has been measured by several experiments with good precision, other quantities such as the $CP$ and isospin asymmetries of the inclusive $B \to X_s \gamma$ are less well determined. To facilitate the precise measurements of such quantities, we study inclusive $B \to X_s \gamma$ decays using a hadronic tagging method, where one of the $B$ mesons in a $B\bar{B}$ event is fully reconstructed in the hadronic final state. In this paper, we show preliminary results of this study using the full Belle data sample of $711~{\rm fb}^{-1}$ integrated luminosity recorded by the Belle detector at the $\Upsilon(4S)$ resonance at the KEKB asymmetric-energy $e^+ e^-$ collider.
        Speaker: Ms Oksana Brovchenko (KIT - Karlsruhe Institute of Technology (DE))
        Slides
      • 15:00
        Studies of rare beauty and charm decays with the CMS experiment 15m
        The rare decays B_s(B^0)->mu+mu-, B0->K*mu+mu- and D0->mu+mu- are excellent tests of the flavor sector of the Standard Model and are sensitive to new physics. We report on studies of these decays performed with the CMS experiment using pp collisions data collected in 2011 at a centre-of-mass energy of 7 TeV. We present the first observation of the excited B baryon Xi_b* in the strong decays to Xi_b- and a charged pion, performed with the CMS experiment at sqrt(s)=7 TeV. In addition, we present measurements of B hadron lifetimes.
        Speaker: Mr Keith Ulmer (University of Colorado at Boulder (US))
        Slides
      • 15:15
        Studies of the electroweak penguin transitions b -> s μ+ μ– and b -> d μ+ μ– at LHCb 15m
        Rare b -> s μ+ μ– transitions that proceed via flavour changing neutral currents are suppressed in the SM and provide a sensitive probe of new physics contributions entering in competing diagrams. The dataset collected with the LHCb experiment has enabled measurements to be made in decays such as B0 -> K*0 μ+ μ–, B+ -> K+ μ+ μ– and B0s -> φ μ+ μ–. Particularly interesting are the angular and isospin asymmetries in the decay B0 -> K(*)0 μ+ μ–, which are sensitive probes of new physics. The large statistics of reconstructed B mesons allow, for the first time, experimental access to b -> d μ+ μ– transitions, such as B+ -> π+ μ+ μ–, which are further suppressed in the SM. The latest results on these decay modes will be presented.
        Speaker: Dr Abraham Antonio Gallas Torreira (Universidade de Santiago de Compostela (ES))
        Slides
      • 15:45
        Refreshment Break 15m
      • 16:00
        Flavour data constraints on supersymmetry and SuperIso 15m
        I will review flavour physics constraints on supersymmetric models and in particular those from b to s gamma, Bs to mu+ mu- and B to K* mu+mu- (with an emphasis on the new LHCb results). These rare transitions provide valuable information in the quest for new physics and are complementary to the direct searches. The SuperIso program will also be described.
        Speaker: Dr Nazila Mahmoudi (CERN (CH) & Clermont Ferrand University (FR))
        Slides
      • 16:15
        Rare kaon decay measurements with NA62/NA48 minimum bias data 15m
        The NA62 (phase-I) experiment at CERN collected a large sample of charged kaon decays in 2007-2008, allowing one to study these decays with a high precision. The first result of the helicity-suppressed ratio RK of the K+- --> e+- nu and K+- --> mu+- nu decay measurement based on this sample is presented. The result is in agreement with the Standard Model expectation, and constrains two-Higgs-doublets extension of the Standard Model. The status of analyses of rare decay K+- --> e nu gamma and very rare decay K+ -> pi+ pi0 e+ e- collected with a low intensity beam and minimum bias trigger conditions in 2007, is presented as well. Using the minimum bias data of NA62 and the data of NA48/2 experiment collected with minimum bias trigger in 2004, a large sample of K+- --> pi gamma gamma decays has been selected and analyzed. This analysis led to a precision test of the Chiral Perturbation Theory. The NA62 experiment at CERN SPS (phase-II) aims to collect of the order of 100 K+->p+nn events in two years of data taking, keeping the background at the level of 10%. The physics prospects and the status of the construction of the experiment will be presented.
        Speaker: Prof. Vladimir Kekelidze (Joint Inst. for Nuclear Research (RU))
        Slides
      • 16:30
        ORKA, The Golden Kaon Experiment: Precision measurement of $K^+\to\pi^+\nu \bar\nu$ and other ultra-rare processes 15m
        Precision measurement of the ultra-rare $K^+\to\pi^+\nu \bar\nu$ decay at Fermilab would be one of the most incisive probes of quark flavor physics this decade. Its dramatic reach for uncovering new physics is due to several important factors: The branching ratio is sensitive to most new physics models which extend the Standard Model to solve its considerable problems. The Standard Model prediction for BR($K^+\to\pi^+\nu \bar\nu$) is broadly recognized to be theoretically robust at the 5--10\% level. Only a precious few accessible loop-dominated quark processes can be predicted with this level of certainty. The $K^+\to\pi^+\nu \bar\nu$ branching ratio is highly suppressed in the Standard Model to the level of $< 10^{-10}$ ($<1$ part in 10 billion). This suppression allows physics beyond the Standard Model to boost the branching fraction with enhancements of up to a factor of five above the Standard Model level. The certainty with which the Standard Model contribution to $K^+\to\pi^+\nu \bar\nu$ can be predicted will permit a 5$\sigmA$ discovery potential for new physics even for enhancements of the branching ratio as small as 35\%. This sensitivity is unique in quark flavor physics and allows probing of essentially all models of new physics that couple to quarks within the reach of the LHC. Furthermore, a high precision measurement of $K^+\to\pi^+\nu \bar\nu$ is sensitive to many models of new physics with mass scales well beyond the direct reach of the LHC. The ORKA initiative aims to precisely measure the $K^+\to\pi^+\nu \bar\nu$ process based on established detector techniques driven with the Fermilab Main Injector high intensity proton source. In recognition of this exciting opportunity the Fermilab director has recently granted scientific approval to the ORKA proposal. The physics reach and experimental techniques of the ORKA initiative will be discussed, as well as opportunities for collaboration in the ORKA adventure and the longer term Intensity Frontier roadmap at Fermilab.
        Speaker: Prof. Mike Hildreth (University of Notre Dame (US))
        Slides
      • 16:45
        Rare and forbidden B decays at BaBar 15m
        Lepton-flavor violation in the standard model occurs only via neutrino mixing, and is thus suppressed by powers of (m_nu / m_W)^2 to far below observable levels. However, in many extensions of the standard model, lepton-flavor violation involving third-generation fermions may be highly enhanced. Study of B decays involving a tau lepton in the final state is complicated by the presence of final-state neutrinos. At an e+e- B factory, this difficulty is handled by reconstructing both B mesons in the event, taking advantage of the high luminosity and clean event environment. Using this technique, we set the first upper limits on the branching fractions of B-->K tau e, B-->pi tau e, and B-->pi tau mu, and improve our previous limit on B-->K tau mu, at the level of a few times 10^-5. The decay of a B0 meson into two neutrinos is suppressed by a helicity factor of order (m_nu / m_B)^2 in the standard model. The same decay with an additional photon in the final state is also predicted to be unobservably rare, with a branching fraction at the level of 10^-9. Thus, observation of such decays would constitute evidence for new physics, and several scenarios beyond the standard model predict branching fractions as high as 10^-6. The search for invisible (+ photon) decays of the B0 requires fully reconstructing the entire event and tagging the presence of the B0, and so can be performed only at an e+e- B factory. We present the results of a new analysis based on the full BABAR dataset and improved reconstruction, obtaining limits several times tighter than the previous results, at the level of 10^-5. The decays B-->K(*)nu nubar are flavor-changing neutral-current (FCNC) processes that proceed via a box or penguin diagram. FCNC decays are suppressed in the standard model, with branching-fraction predictions in the 10^-6 range, but they may be enhanced by new-physics contributions. Due to the final-state neutrinos and the small decay rate, study of these decays can currently be performed only at an e+e- B factory, where reconstruction of the other B in the event (the “tag B”) is possible. We report the results of a new search for these decays using hadronic decays to identify the tag B in the full BABAR data set. We also use our data to search for invisible decays of the J/psi. Lepton number is conserved in the standard model, but may occur in scenarios beyond the standard model, for example, due to the existence of Majorana neutrinos. We report the results of a new search for lepton-number violation in the decays B+ -->K-e+e+, B+ -->pi-e+e+, B+ -->K-mu+mu+, B+ -->pi-mu+mu+, and set upper limits on the branching fractions at a few times 10^-8. Study of the di-electron modes has been performed only in e+e- B factories, and in these modes we improve on previous limits by two orders of magnitude.
        Speaker: Dr Steven Robertson (McGill University (CA))
        Slides
      • 17:00
        Search for Bs(B0)--> mu mu and other exclusive B decays 15m
        The search for the rare decay Bs to mu+ mu- with the ATLAS detector is discussed. Results form analysis of 2.4fb-1 of data collected in 2011 are presented. The production of B-mesons has been studied by ATLAS in several exclusive channels containing a ]/psi. Several analysis are discussed, including the recent observation of Bc -> ]/psi pi.
        Speaker: Dr Paolo Iengo (INFN (IT))
        Slides
      • 17:15
        Searches for very rare decays to purely leptonic final states at LHCb 15m
        We present a review of the searches for very rare decays to muon final states performed at LHCb using 1.0 fb–1 of pp collisions at 7 TeV centre of mass energy. Flavour changing neutral current processes, such as B0s -> μ+ μ– are highly suppressed in the Standard Model (SM). Such decays therefore allow the contributions from new processes or new heavy particles to significantly modify the expected SM rates. Charged lepton flavour violating processes (LFV), such as the neutrinoless τ+ -> μ+ μ– μ+ decay, have vanishingly small decay rates in the SM, but can be significantly enhanced in extended models. We report the latest results on these channels from the LHCb dataset.
        Speaker: Mr Mathieu Perrin-Terrin (Centre de Physique des Particules de Marseille, Université d'Aix-Marseille (FR))
        Slides
      • 17:30
        B physics at SuperB 15m
        SuperB will collect 75ab^-1 of data at the Y(4S). Using this data, the experiment will be able to study rare B decays such as B to l nu and K(*)nu nubar as well as perform precision measurements of the angles of the unitarity triangle and improving measurements of |Vub| and |Vcb|. A few ab^-1 run at the Y(5S) will allow this experiment to search for rare decays of the B_s meson as well as measuring a_SL.
        Speaker: Claudia Cecchi (Universita e INFN (IT))
        Slides
      • 17:45
        Physics with the Belle II experiment 15m
        The B factories — the Belle detector at the KEKB collider in KEK and the BaBar detector at the PEP II in SLAC — have, in more than a decade of data taking, outreached the initial expectations on the physics results. They pointed out few hints of discrepancies between the Standard Model (SM) predictions and the results of the measurements. To experimentally verify the current hints of possible new particles and processes often addressed as the New Physics(NP) a new generation of B factories - the Super B factories - are planned to start operation around 2015. The so-called precision frontier represented by the machines requires the achieved luminosities of the B factories to be raised by O(10^2). We will present the planned measurements and some of the expected precisions on various physics observables which will be reached by the Belle II detector currently being built at KEK. We will comment on the tests of various NP models that will be possible with the upgraded detector.
        Speaker: Prof. Mikhail Danilov (ITEP Institute for Theoretical and Experimental Physics (RU))
        Slides
    • 09:00 18:05
      Room 218 - Detectors and Computing for HEP - TR13 Room 218

      Room 218

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        ATLAS Silicon Microstrip Tracker and Pixel Detector: Status and Performance 15m
        The Semi-Conductor Tracker (SCT) and the Pixel Detector are the key precision tracking devices in the Inner Detector of the ATLAS experiment at CERN LHC. The SCT is a silicon strip detector and is constructed of 4088 silicon detector modules for a total of 6.3 million strips. Each module is designed, constructed and tested to operate as a stand-alone unit, mechanically, electrically, optically and thermally. The SCT silicon micro-strip sensors are processed in the planar p-in-n technology. The signals from the strips are processed in the front-end ASICS ABCD3TA, working in the binary readout mode. The Pixel Detector consists of approximately 80 million pixels that are individually read out via chips bump-bonded to 1744 n-in-n silicon substrates. In the talk the current status of the SCT and Pixel Detector will be reviewed. We will report on the operation of the detectors including an overview of the issues we encountered and the observation of significant increases in leakage currents (as expected) from bulk damage due to non-ionising radiation. The main emphasis will be given to monitoring, calibration procedures, timing optimization, detector performance. and the data quality during the many months of data taking (the LHC delivered 47pb-1 in 2010 and 5.6fb-1 in 2011 of proton-proton collision data at 7 TeV, and two times one-month periods of heavy ion collisions). The SCT and Pixel Detector have been fully operational throughout all data taking periods. The running experience will then be used to extract valuable lessons for future silicon strip detector and pixel detector projects.
        Speaker: Dr Kendall Reeves (University of Texas at Dallas (US))
        Slides
      • 09:15
        Operation and Performance of the CMS Silicon Tracker 15m
        The CMS silicon tracker is the largest silicon detector ever built. It consists of a hybrid pixel detector with 66 million channels and a 200 m2 silicon strip detector with 10 million read out channels. The presentation describes the operation of this detector during the first three year of LHC both during proton-proton as well as heavy ion collisions. Results on the operational performance are presented including alignment, calibration, S/N, timing, etc. Reconstructed photon conversions and nuclear interactions are used to evaluate the material in the tracker. The resolution and efficiency of the track and vertex reconstruction are measured with data and compared to the results from simulation. With increasing integrated luminosity, monitoring of radiation-induced effects becomes more and more important. Our methods for measuring the evolution of full depletion voltage and leakage current will be presented and the results discussed.
        Speaker: Dr Erik Butz (Massachusetts Inst. of Technology (US))
        Slides
      • 09:30
        Status of the Atlas Calorimeters: their performances after two years of LHC operation and plans for future upgrades. 15m
        The ATLAS experiment is designed to study the proton-proton collisions produced at the Large Hadron Collider (LHC) at CERN. Its calorimeter system measures the energy and direction of final state particles with pseudo rapidity $|\eta| < 4.9$. Accurate identification and measurement of the characteristics of electromagnetic objects (electrons/photons) are performed by liquid argon (LAr)-lead sampling calorimeters in the region $|\eta| < 3.2$, using an innovative accordion geometry that provides a fast, uniform azimuthal response without gaps. The hadronic calorimeters measure the properties of hadrons, jets, and tau leptons, and also contribute to the measurement of the missing transverse energy and identification of muons. This is done in the region $|\eta| < 1.7$ with a scintillator-steel sampling calorimeter, and in the region $1.4 < |\eta| < 3.2$ with a copper-LAr sampling calorimeter. The coverage is extended to $|\eta| < 4.9$ by an integrated forward calorimeter (FCal) based on LAr with copper and tungsten absorbers. Following installation in 2004-2006, the calorimeters were extensively commissioned prior to first collisions in 2009. Since then, over 5 fb$^{-1}$ of data have been collected. Results on the calorimeters' operation and performance will be presented, including the calibration, stability, absolute energy scale, uniformity, and time resolution. These results demonstrate that the calorimeters are performing well within the design requirements and are giving reliable input to the physics analyses. Although LHC data-taking is expected to continue for a number of years, plans are already under way for operation at an instantaneous luminosity about 5 times the original design of $10^{34}$ cm$^{-2}$ s$^{-1}$, referred to as the HL-LHC. The calorimeter upgrade involves two phases. In the first, upgrades to the LAr calorimeter electronics will provide more granular information to the trigger and hence reduce the effects of the high pile-up noise. The second phase will be devoted to the complete replacement of the readout electronics of both the scintillator and LAr calorimeters. An additional complication may also arise in the case of the liquid argon hadronic calorimeter, where a replacement of the cold preamplifiers may be needed to cope with the radiation levels. Finally, for the FCal, the increased ionization load at the HL-LHC poses a number of problems that may degrade its performance. These include beam heating, space charge effects in the LAr-gaps, and HV losses due to increased current draws through the current-limiting resistors. A number of proposed solutions will be discussed.
        Speaker: Dr Carlos Solans Sanchez (Universidad de Valencia (ES))
        Slides
      • 09:45
        Performance of the CMS electromagnetic calorimeter at the LHC and role in the hunt for the Higgs boson 15m
        The Electromagnetic Calorimeter (ECAL) of the Compact Muon Solenoid (CMS) experiment at the LHC is a hermetic, fine grained, homogeneous calorimeter, comprising 75,848 lead tungstate (PbWO4) scintillating crystals, located inside the CMS superconducting solenoidal magnet. The scintillation light is detected by avalanche photodiodes (APDs) in the barrel section and by vacuum phototriodes (VPTs) in the two endcap sections. A silicon/lead pre-shower detector is installed in front of the endcaps in order to improve γ/pi0 discrimination. Precise calibration of the ECAL detector is required. This includes inter-calibration, to account for the differing response of channels, and calibration of the energy scale. The performance obtained during the first LHC physics runs in 2010 and 2011 is presented and the role of the ECAL in the hunt for the Higgs boson, through the 2-gamma decay mode, is discussed.
        Speaker: Dr Riccardo Paramatti (INFN - Rome I (IT))
        Diapositivas
      • 10:00
        Luminosity determination in p-p collisions at center-of-mass energy of 7 TeV using the ATLAS detector at the LHC 15m
        A precision luminosity measurement is of critical importance for the ATLAS physics program, both for searches for new physics as well as for precision measurements of Standard Model cross-sections.  The absolute calibration of the ATLAS luminosity scale is based on beam separation (van der Meer) scans which are used to calibrate a variety of luminosity-sensitive detectors.  These detectors then measure the luminosity continuously during regular physics operations.  Uncertainties on the luminosity measurement are evaluated based on the calibration procedure itself, plus uncertainties related to extrapolating this calibration to the entire physics data sample.  The final luminosity measurement for the ATLAS detector during p-p collisions at center-of-mass energy of 7 TeV in 2010 and 2011 is presented, along with prospects for luminosity measurements in p-p collisions at 8 TeV in 2012.
        Speaker: Mr Eric Torrence (University of Oregon (US))
        Slides
      • 10:15
        Measurements of the luminosity and normalised beam-induced background using the CMS Fast Beam Condition Monitor 15m
        The CMS Beam Conditions and Radiation Monitoring system (BRM) is installed to protect the CMS detector from high beam losses and to provide feedback to the LHC and CMS on the beam conditions. The Fast Beam Condition Monitor (BCM1F), one of the sub-detectors in the BRM system, is installed inside the pixel volume close to the beam pipe and consists of two planes of 4 modules each located 1.8 m away from the IP, on both ends. It uses single-crystal CVD diamond sensors, radiation hard front-end electronics and an optical transmission of the signal. It is designed for single particle rate measurements, detecting both machine induced beam background and collision products on a bunch-by-bunch basis. Presented is the implementation of the normalized online beam-induced background measurement and the online instantaneous luminosity measurement. The method for determining the luminosity from the measured rates, including the absolute calibration using the Van der Meer scan, and the measurement performance will be described.
        Speaker: Mr Nathaniel Jay Odell (Northwestern University (US))
        Slides
      • 10:30
        Diamond sensors in HEP 15m
        Progress in experimental particle physics in the coming decade depends crucially upon the ability to carry out experiments at high energies and high luminosities. These conditions imply that future experiments will take place in very high radiation areas. In order to perform these complex and expensive experiments new radiation hard technologies will have to be developed. Chemical Vapour Deposition (CVD) diamond is being developed as a radiation tolerant material for use very close to the interaction region where detectors may have to operate in extreme radiation conditions. During the past few years many CVD diamond devices have been manufactured and tested. As a detector for high radiation environments CVD diamond benefits substantially from its radiation hardness, very low leakage current, low dielectric constant, fast signal collection and ability to operate at room temperature. As a result CVD diamond now has been used extensively in beam conditions monitors as the innermost detectors in the highest radiation areas of colliders. CVD diamond is being considered as a sensor material for the particle tracking detectors closest to the interaction region where the most extreme radiation conditions exist. We will present the state-of-the-art of the radiation tolerance of the highest quality CVD diamond material for a range of proton energies, pions and neutrons obtained from strip detectors constructed with this material. Recently single crystal CVD diamond material has been developed which resolves many of the issues associated with polycrystalline material. We will also present recent results on radiation tolerance obtained from strip detectors constructed from this new diamond material. We will discuss the use of diamond detectors and their survivability in the highest radiation environments. Currently diamond is deployed in HEP experiments for two tasks: for beam conditions monitoring and measurement of luminosity. Beam conditions can be deduced either from beam induced current measurements replacing the commonly used ionization chambers by CVD diamond pad detectors (e.g. ATLAS BLM; CMS BCM1, BCM2) or by particle counting (ATLAS BCM; CMS BCMF). Due to its fast response and insensitivity to pile-up, ATLAS BCM also serves as the preferred luminosity monitor. As a result of positive experience with the ATLAS BCM an upgraded Diamond Beam Monitor (DBM) is being prepared for installation during the 2013-14 LHC shutdown. This detector will consist of 8 three-layer telescopes of pixelated diamond detectors. Each plane will have ~27k active pixels. The telescopes will provide sub-mm impact parameter resolution adding spatial information on the origin of backgrounds to the already precise (sub-ns) timing information from the BCM. This talk will describe the design and construction of both the ATLAS BCM and DBM systems as well as showing results from the first two years of BCM operation and test-beam studies of the DBM modules.
        Speaker: Prof. Marko Mikuz (University of Ljubljana, Jozef Stefan Institute (SI))
        Slides
      • 10:45
        Refreshment Break 15m
      • 11:00
        Operations and Performance of the CMS DT and RPC muon systems 15m
        The Drift Tubes (DT) detector in the CMS experiment triggered and recorded high quality data during the LHC run in 2011, observing muons from pp collisions at a center of mass energy of 7 TeV. More than 99% of the detector channels participated in data taking with very good performances in terms of up-time and efficiency. Prompt data were monitored in order to evaluate noise and backgrounds and to determine calibrations. The DT system showed excellent performance: at the trigger level, with excellent bunch crossing identification capability, despite long drift times intrinsic to the detector technology; and at the reconstruction level, reaching very good spatial and temporal resolution. Weak points of the current detector and electronics were also identified, and actions to mitigate their possible impact were taken during the run where possible. Future developments were planned in view of upgrade campaigns during the accelerator shutdowns. The first results of the 2012 run at 8 TeV center of mass energy will also be presented. The Resistive Plate Chambers are used in CMS as dedicated muon trigger in both barrel and endcap region. They also contribute to the identification of the muons together with Drift tube in the barrel and Cathod Strip Chambers in the endcaps. We will report the operations and performance of the system after two years of LHC activities with increasing instantaneous luminosity. Special attention will be given to the stability of the system and to the working point calibration procedures.
        Speaker: Dr Gabriella Pugliese (Universita e INFN & Politecnico di Bari (IT))
        Slides
      • 11:15
        Study of the performance of the muon and tau identification at ATLAS 15m
        Charged leptons play an important role in the physics programme at the LHC. The performance of identification of charged leptons must be know with high precision. This talk present the studies of the muon and tau identification performance at the ATLAS experiment. In 2012 the LHC is operated in a mode leading to up to 40 inelastic pp collisions per bunch crossing, so-called ”pile-up”, with an average number of 20 inelastic collisions. The high multiplicity of charged tracks in the inner tracking detector makes it difficult to reconstruct and identify muons at high efficiency and low misidentification rate. Di-muon decays of J/ψ mesons and Z bosons have been used to study the muon reconstruction and identification efficiency as a function of the muon transverse momentum from pT = 4 GeV to pT = 100 GeV and the number of inelastic collisions per event. The misidentification rate was determined with Z+jet events. Optimal identification of hadronically decaying tau leptons is achieved by using detailed information from tracking and calorimeter detector components. Variables describing the properties of calorimeter energy deposits and track reconstruction within tau candidates are combined in multi-variate discriminants, to achieve high rejection against backgrounds, which is challenging in high luminosity environments. The identification efficiencies are measured by W->taunu and Z->tautau events. The energy scale uncertainties for tau leptons are determined by investigating single hadron calorimeter response, as well as kinematic distributions in Z->tautau events.
        Speaker: Dr Mansoora Shamim (University of Oregon (US))
        Slides
      • 11:30
        Alignment procedures for the CMS Silicon Tracker detector 15m
        The CMS all-silicon tracker consists of 16588 modules: aligning them with the desired precision of a few micrometers is only feasible using track based alignment procedures. Ultimate precision is now achieved by the determination of sensor curvatures in addition to the local translation and rotation of modules in space. This challenges the alignment algorithms to determine about 200k parameters simultaneously. This is achieved using the Millepede II program, interfaced with CMS software. The alignment of the detector is also monitored using its built in Laser Alignment System. For this, 3% of the silicon strip modules are illuminated by the laser beams, assuring a continuous surveillance during data taking. The system allows to monitor the alignment changes with a precision better than 10 micron and to measure the absolute alignment parameters better than 100 microns. The main remaining challenge for the alignment are global distortions that systematically bias the track parameters and thus physics measurements. These distortions are controlled by adding further information into the alignment workflow, e.g. the mass of decaying resonances. The orientation of the tracker with respect to the magnetic field of CMS is determined with a stand-alone chi-square minimization procedure. The resulting geometry is finally carefully validated: the monitored quantities include the basic track quantities for tracks from both collisions and cosmic muons and physics observables like resonance masses.
        Speaker: Dr Roberto Castello (Universite Catholique de Louvain (BE))
        Slides
      • 11:45
        Tracking, vertexing and b-tagging performance in ATLAS 15m
        ATLAS is a multipurpose experiment at the LHC proton-proton collider. In order to reconstruct trajectories of charged particles, ATLAS is equipped with a tracking system built using different technologies, silicon planar sensors (pixel and micro-strip) and gaseous drifttubes, all embedded in a 2T solenoidal magnetic field. ATLAS physics goals require high resolution, unbiased measurement of all charged particle kinematic parameters in order to assure e.g. accurate interaction and decay vertex finding. The precision on track parameters critically depend on the systematic effects related to the alignment of the tracking system. In particular, small collective deformations due to sudden environmental changes (temperature, magnetic field) have to be identified and corrected in quasi-real time. The reconstruction of the primary interaction vertices is important to identify the hard scattering process and to measure the amount of pile-up interactions, while the reconstruction of so called secondary vertices is an important ingredient in the identification of jets originating from bottom quarks. The latter, referred to as b-tagging, is of great use in many high-profile physics analyses in e.g. the top quark, Higgs and new phenomena sectors to suppress background processes containing predominantly light-flavour jets. Performance of alignment, track and vertex reconstruction efficiency and resolution achieved in the 2011 and prospects for the 2012 LHC proton-proton collision runs will be discussed. We will present measurements of the b-tag efficiency carried out with jets containing muons as well as with b-jets from top quark decays. A novel measurement of the efficiency to b-tag jets originating from c-quarks, using a sample of jets containing D* mesons, will also be presented as well as two complementary measurements of the rate with which jets originating from light-flavour partons are mistakenly tagged as b-jets.
        Speaker: Dr Mark James Tibbetts (Lawrence Berkeley National Laboratory (US))
        Slides
      • 12:00
        Performance of Jets and Missing Transverse Energy in CMS 15m
        A summary of the measurements of the jet energy calibration in CMS is presented, performed with data samples collected in proton-proton collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 1.6/fb. The final jet energy calibration is based on dijet, γ+jet and Z+jet events. The results are presented for the "Particle Flow" approach, which attempts to reconstruct individually table particles in the event, prior to the jet clustering, based on information from all relevant subdetectors. We discuss the effect of pile-up interactions and the state of the art mitigation techniques used in CMS and we describe the main sources of uncertainty on the jet energy calibration. Finally, the results of comprehensive studies of missing transverse energy are presented.
        Speaker: Mr Joram Berger (KIT (DE))
        Slides
      • 12:15
        Performance of Jets and Missing Transverse Energy in ATLAS 15m
        After the analysis of the 2010 proton proton collision data provided by LHC, the ATLAS experiment has achieved an accuracy of the jet energy measurement between 2-4% for jet transverse momenta from 20 GeV to about 2 TeV in the pseudo-rapidity range up to |eta|=4.5. The jet energy scale uncertainty is derived from in-situ single hadron response measurements along with systematic variations in the Monte Carlo simulation. In addition, several in situ techniques exploiting transverse momentum balance are exploited. Preliminary results from the 2011 run based on an integrated luminosity of 5/fb reducing further the uncertainties on the jet energy scale will also be presented. Results on the energy scale and resolution of the reconstructed missing transverse momentum (ETmis) from 2010 and 2011 collision data will be presented. The uncertainty evaluation mainly relies on events with a Z-boson. Special attention will be given to the influence of the large number of interactions produced in addition to the event of interest (pile-up). Techniques to mitigate pile-up effects for jets and ETmiss will be discussed. Advanced approaches to jet reconstruction using jet grooming algorithms such as filtering, trimming, and pruning are compared. Such techniques aim to reconstruct the jet mass and jet substructure with special focus on highly boosted particles
        Speaker: Prof. Ariel Gustavo Schwartzman (SLAC National Accelerator Laboratory (US))
        Slides
      • 12:30
        Development and Construction of Muon Drift-Tube (sMDT) Chambers for Upgrades of the ATLAS Muon Spectrometer at High LHC Luminosities 15m
        For the planned high-luminosity upgrades of the Large Hadron Collider (LHC)increasing background rates of neutrons and gamma rays are expected exceed the rate capability of the current ATLAS muon tracking detectors. Drift-tube chambers with a tube diameter of 15 mm have (sMDT chambers) been developed for upgrades of the ATLAS muon spectrometer. A full sMDT prototype chamber has been constructed and tested in a muon beam at CERN and at high gamma and proton irradiation rates. The chamber design and construction procedures are discussed. The test results demonstrate the required track reconstruction efficiency and spatial resolution of the sMDT chambers at background rates far beyond the maximum expected values. The sense wire locations in the prototype chamber have been measured with few micron precision with cosmic rays confirming the required wire positioning accuracy of better than 20 microns. Currently sMDT chambers are under construction for installation in the ATLAS muon spectrometer in the 2013/14 LHC shutdown. Further sMDT chamber construction for subsequent upgrades are in the planning phase. New readout electronics for the chambers with higher bandwidth and better radiation hardness is also under development.
        Speaker: Dr Hubert Kroha (Max-Planck-Institut für Physik (DE))
        Slides
      • 12:45
        Exploring physics beyond the Standard Model with a Muon Acceleration Facility 15m
        An accelerator complex that can produce ultra-intense beams of muons presents many opportunities to explore new physics. A facility of this type is unique in that, in a relatively straightforward way, it can present a physics program that can be staged and thus move forward incrementally, addressing exciting new physics at each step. An intense cooled low-energy muon source can be used to perform extraordinarily precise lepton flavor violating experiments. These same muons can be accelerated and then stored in a race track-like storage ring to produce neutrinos for experiments to explore neutrino mixing with unprecedented precision, creating the so-called Neutrino Factory. Finally, these muons could be accelerated to very-high energy to do energy-frontier physics with a muon collider. In this talk I will give an introduction to muon accelerator facilities and their physics capabilities and then will discuss some of the limiting technologies that must be developed in order to make these concepts a reality and the US Muon Accelerator Program that aims to address these technical challenges.
        Speaker: Prof. Donald Hartill (Cornell University (US))
        Slides
      • 13:00
        Lunch Break 1h
      • 14:00
        Performance of the CMS Level-1 Trigger 20m
        The first level trigger of the CMS experiment is comprised of custom electronics that process data from the calorimeters and muon detectors in order to select the most interesting events from LHC collisions. The rate of events selected by this Level-1 trigger must be reduced from the beam crossing frequency to no more than 100 kHz before detector digitization and High Level Trigger processing can occur. Here we report on the efficiencies, resolution, and trigger rates of the Level-1 trigger as measured from LHC proton collisions at 7 and 8 TeV center-of-mass energies. Example trigger menus used to select events for physics analysis by the CMS experiment also will be discussed.
        Speaker: Dr Jim Brooke (University of Bristol (UK))
        Slides
      • 14:20
        The ATLAS Trigger Performance and Evolution 20m
        During the data taking period from 2009 until 2011, the ATLAS trigger has been very successfully used to collect proton-proton data at LHC centre-of-mass energies between 900 GeV and 7 TeV. The three-level trigger system reduces the event rate from the design bunch-crossing rate of 40 MHz to an average recording rate of about 300 Hz. Using custom electronics with input from the calorimeter and muon detectors, the first level rejects most background collisions in less than 2.5 microseconds. Then follow two levels of software-based triggers. The trigger system is designed to select events by identifying muons, electrons, photons, taus, jets and B hadron candidates, as well as using global event signatures, such as missing transverse energy. We give an overview of the strategy and performance of the different trigger selections based mainly on the experience during the 2011 LHC run, where the trigger menu needed quick adaptations to the continuous increase of luminosity throughout the year. Examples of trigger efficiencies and resolution with respect to offline reconstructed signals are presented and compared to simulation. These results illustrate that we have achieved a very good level of understanding of both the detector and trigger performance and successfully selected suitable streamed data samples for analysis. Furthermore, we describe how the trigger selections and overall trigger menu (like adding topological triggers, using isolation or using multi-variate techniques) have been re-designed and re-optimized to cope with the increased center-of-mass energy and pileup conditions foreseen in 2012. Initial experience and performance of the trigger running with 8 TeV center-of-mass energy collisions this year will also be described.
        Speaker: Dr Brian Petersen (CERN (CH))
        Slides
      • 14:40
        The CMS High Level Trigger 15m
        The CMS experiment has been designed with a 2-level trigger system: the Level 1 Trigger, implemented using FPGA and custom ASIC technology, and the High Level Trigger (HLT), implemented running a streamlined version of the CMS offline reconstruction software on a cluster of commercial rack-mounted computers, comprising thousands of CPUs. The design of a software trigger system requires a tradeoff between the complexity of the algorithms running online, the output rate, and the selection efficiency. The complexity is limited by the available computing power, while the rate is constrained by the offline storage and processing capabilities. The main challenge faces during 2012 is the fine-tuning and optimisation of the algorithms, in order to cope with the increasing LHC pile-up without impacting the physics performance. Here we will present a review of the performance of the main triggers uses during the 2012 data taking, ranging from simpler single-object selections to more complex algorithms combining different objects, and applying analysis-level reconstruction and selection. We will discuss how the increasing LHC pile-up is affecting their performance, and how these effects is being mitigated.
        Speaker: Dr Stéphanie Beauceron (Universite Claude Bernard-Lyon I (FR))
        Slides
      • 14:55
        The ATLAS Data Acquisition and High Level Trigger Systems: Experience and Upgrade Plans 15m
        The ATLAS DAQ/HLT system reduces the Level 1 rate of 75 kHz to a few kHz event build rate after Level 2 and a few hundred Hz out output rate to disk. It has operated with an average data taking efficiency of about 94% during the recent years. The performance has far exceeded the initial requirements, with about 5 kHz event building rate and 500 Hz of output rate in 2012, driven mostly by physics requirements. Several improvements and upgrades are foreseen in the upcoming long shutdowns, both to simplify the existing architecture and improve the performance. On the network side new core switches will be deployed and possible use of 10GBit Ethernet links for critical areas is foreseen. An improved read-out system to replace the existing solution based on PCI is under development. A major evolution of the high level trigger system foresees a merging of the Level 2 and Event Filter functionality on a single node, including the event building. This will represent a big simplification of the existing system, while still maintaining the flexibility of the Region of Interest based approach. It will furthermore open up new optimizations and simplifications in the existing HLT code.
        Speaker: Dr Reiner Hauser (Michigan State University (US))
        Slides
      • 15:10
        Evolution of the CMS Trigger System 15m
        A key challenge at high luminosity hadron colliders is the selection of sufficiently pure event samples against large QCD backgrounds, whilst keeping data rates within practical bounds. The CMS trigger system performs the first step in event selection, and its performance dictates the physics reach of the experiment in many areas. As LHC luminosity continues to increase over the next decade, both the trigger strategy and systems must evolve. We describe the upgrade plans for the CMS trigger, including the possible use of tracking information at level-1, and explore the impact for the high-luminosity physics programme.
        Speaker: Dr Ivan Kresimir Furic (University of Florida (US))
        Slides
      • 15:25
        Upgrade project and plans for the ATLAS detector and first level trigger. 15m
        In the coming years, the LHC complex will be upgraded to extend the physics potential of the experiments. The average luminosity will be increased by a factor 5 to 10 above the original design one. The planned upgrades require, among other detector and DAQ system improvements, a significant higher selectivity of the trigger system, to cope with the increased radiation level and particle rates. In this paper we describe the changes to the ATLAS detector and its trigger system currently under study. The calorimetry--‐based trigger detectors will improve their selectivity by benefiting from the increased granularity available at the trigger level, which will allow for a higher energy resolution. In the muon detector, the momentum resolution of the trigger can be improved by using the precision muon tracking detectors, the Monitored Drift Tuber chambers (MDT). An MDT--‐based trigger scheme has been developed and validated, based on new radiation--‐hard readout chips currently under development. The use of the inner tracking system in the lower levels of the trigger selection is also discussed. While the second level trigger will be helped by a new fast tracking system, the addition of tracking information at the first level trigger during the last phase of the LHC upgrade is currently under discussion. Different scenarios are compared, having in mind the requirements to achieve the expected physics potential of ATLAS in this high luminosity regime.
        Speaker: Dr Mimmo Della Volpe (Università "Federico II" di Napoli & INFN (IT))
        Slides
      • 15:40
        Refreshment Break 20m
      • 16:00
        The LHCb upgrade 20m
        The LHCb experiment is designed to perform high-precision measurements of CP violation and search for New Physics using the enormous flux of beauty and charmed hadrons produced at the LHC. The operation and the results obtained from the data collected in 2010 and 2011 demonstrate that the detector is robust and functioning very well. However, the limit of ~1 fb-1 of data per year cannot be overcome without improving the detector. We therefore plan for an upgraded spectrometer by 2018 with a 40 MHz readout and a much more flexible software-based triggering system that will increase the data rate as well as the efficiency specially in the hadronic channels. Here we present the LHCb detector upgrade plans.
        Speaker: Prof. Franz Muheim (University of Edinburgh (UK))
        Slides
      • 16:20
        ATLAS Upgrades Towards the High Luminosity LHC: extending the discovery potential 15m
        After successful LHC operation at 7 TeV in 2011, the LHC is scheduled to deliver even more data in 2012. Meanwhile, plans are actively advancing for a series of upgrades, culminating roughly 10 years from now in the high luminosity LHC (HL-LHC) project, delivering of order five times the LHC nominal instantaneous luminosity along with luminosity levelling. The final goal is to extend the data set from about 300 fb-1 expected for LHC running to 3000 fb-1 by around 2030. Current planning in ATLAS also has significant upgrades to the detector during the consolidation of the LHC to reach full LHC energy and further upgrades to accommodate running already beyond nominal luminosity this decade. The challenge of coping with HL-LHC instantaneous and integrated luminosity, along with the associated radiation levels, requires further major changes to the ATLAS detector. The designs are developing rapidly for an all-new inner-tracker, significant upgrades in the calorimeter and muon systems, as well as improved triggers and data acquisition. This presentation summarises the various improvements to the ATLAS detector required to cope with the anticipated evolution of the LHC instantaneous luminosity during this decade and the next.
        Speaker: Dr Markus Elsing (CERN (CH))
        Slides
      • 16:35
        Status and Plans for the Upgrades of the CMS Detector 15m
        The LHC has successfully delivered more than 12 /fb of data through operations from 2009-2012, which CMS has used for wide range of physics analyses. CMS is planning a set of detector upgrades beginning in 2013 and continuing to support physics in the HL-LHC era, which will extend the delivered luminosity up to 3000 /fb by 2030. The projects already in the technical design phase in planned improvements include an improved pixel tracker, enhancements to the hadronic calorimeters, and a more-powerful Level-1 trigger. For HL-LHC, designs for a trigger-capable tracker and extremely radiation-hard forward calorimeters are under study. This presentation summarizes the various improvements to the CMS detector planned to optimize the physics yield from LHC data over the next 20 years.
        Speaker: Prof. Jeremy Mans (University of Minnesota (US))
        Slides
      • 16:50
        Overview of the ATLAS Insertable B-Layer (IBL) Project 15m
        The upgrades for the ATLAS Pixel Detector will be staged in preparation for high luminosity LHC. The first upgrade for the Pixel Detector will be the construction of a new pixel layer which will be installed during the first shutdown of the LHC machine, foreseen in 2013-14. The new detector, called the Insertable B-layer (IBL), will be installed between the existing Pixel Detector and a new, smaller radius beam-pipe at a radius of 3.3 cm. The IBL will require the development of several new technologies to cope with increased radiation and pixel occupancy and also to improve the physics performance through reduction of the pixel size and a more stringent material budget. Two different and promising silicon sensor technologies, planar n-in-n and 3D, are currently under investigation for the IBL. An overview of the IBL project, of the module design and their qualification with particular emphasis on irradiation tests will be presented.
        Speaker: Dr Mario Giordani (INFN Trieste (IT))
        Slides
      • 17:05
        The status of the CMS pixel upgrade detector 15m
        The present CMS pixel detector was designed for a maximum luminosity of 1×1034 cm−2s−1. Following the Phase 1 upgrade of the LHC, the peak luminosity is foreseen to reach 2×1034 cm−2s−1. Due to the radiation damage and large data losses in the readout chip the present pixel system must be replaced by a new one in the long shutdown of 2016. The current status of the CMS pixel detector upgrade project will be presented. The new features of the proposed detector that will be discussed are ultra-light mechanical design with four barrel layers and 3 end-cap disks, digital readout chip with higher rate capability and new cooling system.
        Speaker: Mr Ferdinando Giordano (University of California Riverside (US))
        Slides
      • 17:20
        Precision tracking at high background rates with the ATLAS muon spectrometer 15m
        The ATLAS muon spectrometer performs to the specs of efficiency, occupancy and spatial resolution at present LHC peak-luminosities of $4 \times 10^{33}$ $\frac{1}{cm^2~s}$. Ten times higher peak-luminosities are envisaged after the LHC upgrade by end of this decade. Currently used tracking detectors in the most forward part of the muon spectrometer need to be replaced to cope with the expected huge background hit rates of up to 15~kHz/cm$^2$ to ensure muon trigger and precision reconstruction capabilities. Square meter sized micromegas or 15~mm diameter drift-tube detectors together with thin gap trigger detectors are under study as replacement. When exposed at our irradiation facility at the Garching Tandem accelerator laboratory, the track reconstruction efficiency and spatial resolution of 15~mm drift-tube detectors is robust against up to 20~kHz/cm$^2$ highly ionizing background hits. No signs of ageing were observed after accumulating an irradiation dose corresponding to 10 years of high luminosity LHC operation. For the micromegas detectors, which are intrinsically high rate capable, a single hit spatial resolution of 40~$\mu$m has been shown. Micromegas using resistive strip technology have been successfully operated unter $10^7$ Neutrons$/cm^2~s$ of 11~Mev. For the central part of the muon spectrometer, the installed monitored 30~mm diameter drift-tube detectors remain in place but may be operated using a considerably faster and linear drift-gas mixture. Such gas mixtures have been shown to be marginally sensitive to high photon fluences and do not age due to ionizing radiation.
        Speaker: Dr Ralf Hertenberger (Ludwig-Maximilians-Univ. München (DE))
        Slides
      • 17:35
        Performance and Upgrade plans for the CMS Hadron Calorimeter at the LHC 15m
        The hadron calorimeters of the CMS experiment have successfully recorded data at 7 TeV and 8 TeV center-of-mass energy during 2011 and 2012 LHC operation. The performance of all systems (barrel, end-cap, forward and the outer calorimeters) are discussed and results from the full 2011 dataset are shown on noise rejection, calibration, collision timing, and identification of jet candidates and for other salient features. In addition, the CMS collaboration is planning improvements to the hadron calorimeters which include the replacement of the HPD photodetectors with SiPMs, increased depth segmentation in the calorimeter, and the inclusion of TDC capability. The status of the R&D for these upgrades will be discussed, including the testing of the upgraded microTCA readout electronics during current LHC data taking.
        Speaker: Dr Sudarshan Paramesvaran (University of California Riverside (US))
        Slides
      • 17:50
        Radiation-Hard High-Speed Parallel Optical Links 15m
        We have designed two ASICs for possible applications in the optical links of a new layer of the ATLAS pixel detector for the initial phase of the LHC luminosity upgrade. The ASICs include a high-speed driver for a VCSEL and a receiver/decoder to extract the data and clock from the signal received by a PIN diode. Both ASICs contain 12 channels for operation with a VCSEL or PIN array. Among these channels, the outer four channels are designated as spares to bypass a broken PIN or VCSEL within the inner eight channels. The ASICs were designed using a 130 nm CMOS process to enhance the radiation-hardness. With the spacing of 250 μm between two VCSEL or PIN channels, the width of an optical array is only 3 mm. This allows the fabrication of compact parallel optical engine for installation at a location where space is at a premium. The fabricated receiver/decoder properly decodes the bi-phase marked input stream with no bit error at low PIN current. The performance of the VCSEL driver at 5 Gb/s is satisfactory. We are able to program the ASICs to bypass a broken PIN or VCSEL and the power-on reset circuits have been successfully implemented to set the ASICs to a default configuration in an event of communication failure. We have irradiated the receiver/decoder to high dose and observe no significant degradation and the SEU rate is low. We plan to irradiate the VCSEL drivers in the summer to measure the radiation hardness. We will present results from the study at the conference. In addition, we will briefly present the status of the design of a new VCSEL driver ASIC to operate at 10 Gb/s which will yield an aggregated bandwidth of 120 Gb/s for a fiber ribbon.
        Speaker: Prof. Kock Kiam Gan (Ohio State University (US))
        Slides
    • 09:00 18:00
      Room 219 - Beyond the Standard Model SUSY / Non-SUSY - TR2&3 Room 219

      Room 219

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        Natural Supersymmetry 15m
        The non-observation of signals for supersymmetry in the LHC data appears to have led to questions about the viability of supersymmetry in nature. We delineate clear criteria for SUSY models which stabilize the electroweak scale, and show that these models are not in conflict the non-appearance of SUSY in the 2011 LHC data. Finally, we discuss some phenomenological implications of these Natural SUSY scenarios.
        Speaker: Prof. Xerxes Tata (University of Hawaii (US))
        Slides
      • 09:15
        GUT-less mSUGRA 15m
        In this talk we consider the phenomenology of minimal supergravity (mSUGRA) models in which the supersymmetry-breaking parameters are unified at a scale below the GUT scale. After a brief review of the so-called GUT-less constrained MSSM (CMSSM), we turn to a GUT-less version of mSUGRA. Of particular interest are GUT-less Polonyi models. The possibility that the recent ATLAS and CMS results may be compatible with a Standard Model-like Higgs boson with a mass of approximately 125 GeV is addressed. The dark matter candidate may be either the gravitino or the lightest neutralino. In the latter case, we discuss the prospects for direct detection via elastic scattering on nuclei.
        Speaker: Ms Pearl Sandick (University of Utah (US))
        Slides
      • 09:30
        Higgs boson mass in GMSB with messenger-matter mixing 15m
        In minimal models of gauge mediated SUSY breaking the mass of the lightest neutral Higgs boson cannot exceed about 118 GeV, provided that the SUSY particle masses are below 2 TeV. This work investigates the Higgs boson mass in the presence of messenger--matter mixing. Such mixing would generate a non-zero A-term (trilinear soft SUSY braking term) at the messenger scale, which enhances the Higgs mass to about 126 GeV, even when all superparticle masses are below a TeV. Such a spectrum is shown to be consistent with recent LHC limits. The increase in m_h is maximal in the case of messengers belonging to 10+10* of SU(5). The embedding of these models in SU(5), along with a flavor U(1) symmetry, addresses the fermion mass hierarchy problem and generates naturally large neutrino mixing angles, while being consistent with all flavor changing processes.
        Speaker: Prof. Kaladi S. Babu (Oklahoma State University (US))
        Slides
      • 09:45
        Implications of a SM like Higgs for a natural NMSSM with low cutoff 15m
        We will present a study of the NMSSM with a low cutoff in the light of the recent experimental hints for a (close to) SM like Higgs at 125 GeV. The introduction of a singlet with a large value of lambda reduces the fine tuning in comparison to the MSSM and provides a solution to the mu-problem. We determine the natural region in parameter space with a fine tuning better than 10% which satisfies electroweak constraints and study its implications for phenomenology.
        Speaker: Dr Michael Schmidt (University of Melbourne (AU))
        Slides
      • 10:00
        SUSY Without Prejudice at LHC-7 & -8 15m
        We will examine the capability of the 7/8 TeV LHC to explore the 19(20) dimensional parameter space of the pMSSM SUSY model following the ATLAS MET analysis suite. Allowing for either a neutralino or gravitino LSP and assuming all sparticle masses lie below 4 TeV, we demonstrate that the LHC searches can cover a large fraction of this space. The importance of non-MET searches, such as those for heavy stable charged particles, $A\to \tau \tau$ and $B_s \to \mu\mu$ will also be discussed.
        Speaker: Dr Thomas Rizzo (SLAC (US))
        Slides
      • 10:15
        A 125 GeV Higgs in the PQ violating minimal Supergravity model 15m
        Motivated by the recent hints from ATLAS and CMS we consider a minimal supersymmetric model which, due to its approximate Peccei-Quinn symmetry, naturally accommodates a 125 GeV Higgs boson. This model can also explain the potentially anomalous branching ratios of such a Higgs. We examine whether other experimental evidence supports this scenario.
        Speaker: Dr Sudhir Kumar Gupta (Monash University (AU))
        Slides
      • 10:30
        Refreshment Break 30m
      • 11:00
        Flavour violating squark and gluino decays at LHC 15m
        We study the effect of squark generation mixing on squark and gluino production and decays at LHC in the Minimal Supersymmetric Standard Model (MSSM) with focus on mixing between second and third generation squarks. Taking into account the constraints from B-physics we show that various regions in parameter space exist where decays of squarks and/or gluinos into flavour violating final states can have large branching ratios of up to ~ 40%. Here we consider both fermionic and bosonic final states. Rates of the corresponding signals, e.g. pp -> t t cbar cbar missing-E_T X, can be significant at LHC(14 TeV). We find that the inclusion of flavour mixing effects can be important for the search of squarks and gluinos and the determination of the underlying model parameters of the MSSM. (A part of this work is published in Phys. Rev. D84 (2011) 115026; arXiv:1107.2775 [hep-ph].)
        Speaker: Prof. Keisho Hidaka (Tokyo Gakugei University (JP))
        Slides
      • 11:15
        Illuminating the 130 GeV Gamma Line with Continuum Photons 15m
        There is evidence for a 130 GeV $\gamma$-ray line at the Galactic Center in the \emph{Fermi} Large Area Telescope data. Dark matter candidates that explain this feature should also annihilate to Standard Model particles, resulting in a continuous spectrum of photons. To study this continuum, we analyze the \emph{Fermi} data down to 5 GeV, restricted to the inner $3^\circ$ of the Galaxy. We place a strong bound on the ratio of continuum photons to monochromatic line photons that is independent of uncertainties in the dark matter density profile. Neutralino dark matter is excluded by the derived constraints.
        Speaker: Prof. Jacob Wacker (SLAC (US))
        Slides
      • 11:30
        Searches for long-lived particles with the ATLAS detector 15m
        Several extensions of the Standard Model predict the existence of massive long-lived particles. We report on searches for weakly-interacting long-lived particles decaying to collimated lepton-jets far away from the interaction point, and for production of highly-ionizing magnetic monopoles. The talk presents results of analyses using data recorded in 2011 at sqrt(s)=7 TeV centre-of-mass energy by the ATLAS experiment at the LHC
        Speaker: Dr Andrew Haas (New York University)
        Slides
      • 11:45
        Search for Charged Massive Long-Lived Particles 15m
        We report on a search for charged massive long-lived particles (CMLLPs), based on data collected with the D0 detector at the Fermilab Tevatron ppbar collider. We search for events in which one or more particles are reconstructed as muons but have speed and ionization energy loss (dE/dx) inconsistent with muons produced in beam collisions. CMLLPs are predicted in several theories of physics beyond the standard model. We present limits on massive long-lived particles in several supersymmetric theories.
        Speaker: Prof. Yuri Gershtein (Rutgers University (US))
        Slides
      • 12:00
        Search for new massive stable particles at CMS 15m
        Several models of new physics, including split supersymmetry, predict the existence of heavy particles which are long-lived on timescales of the bunch spacing of the LHC. We present the results three dedicated searches using the measurement of the energy loss dE/dx in the tracking system, the time-of-flight and special jet triggers. The full sample of 5 fb-1 of pp collisions recorded with CMS in 2011 at the center-of-mass-energy of 7 TeV has been used
        Speaker: Dr Fedor Ratnikov (KIT (DE))
        Slides
      • 12:15
        Search for new physics with displaced leptons, jets, and photon at CMS 15m
        We present results of searches for new long-lived particles with a distinctive signature of decay products far from the primary event vertex. Dedicated trigger and reconstruction algorithms have been developed to identify such displaced particles. The full sample of 5 fb-1 of pp collisions recorded with CMS in 2011 at the center-of-mass energy of 7 TeV has been used.
        Speaker: Prof. Valerie Halyo (Princeton University (US))
        Slides
      • 12:30
        A Seiberg Dual for the MSSM: Partially Composite W and Z 20m
        We examine the possibility that the SU(2) gauge group of the standard model appears as the dual "magnetic" gauge group of a supersymmetric gauge theory, thus the W and Z (and through mixing, the photon) are composite (or partially composite) gauge bosons.
        Speaker: Prof. Yuri Shirman (University of California Irvine)
        Slides
      • 12:50
        Lunch Break 1h 10m
      • 14:00
        Searches for vector-like quarks with the ATLAS detector 15m
        Various extensions of the Standard Model predict the existence of new types of quarks. We report on several search channels such as vector-like quarks that couple to light quarks and Z or W bosons or new quarks decaying to Z boson and b quark. The talk presents results from searches for vector like quarks using the data sample recorded in 2011 at sqrt(s)=7 TeV centre-of-mass energy by the ATLAS experiment at the LHC.
        Speaker: Mr Merlin Davies (Universite de Montreal (CA))
        Slides
      • 14:15
        4th generation searches at ATLAS 15m
        The top-quark is the heaviest known fundamental particle with unique properties within the Standard Model. Its large couplings to the Higgs boson, and being the only quark that decays before hadronisation make it sensitive to new physics beyond the SM. A potential extension for the SM would be the adjonction a 4th family of heavy chiral fermions that could provide new sources of CP violation to explain the matter-antimatter asymmetry in the Universe, and allow for a heavier Higgs boson while remaining consistent with other precision electroweak studies. We report on searches for 4th generation quarks using the data sample recorded in 2011 at sqrt(s)=7 TeV centre-of-mass energy by the ATLAS experiment at the LHC.
        Speaker: Dr Lorenzo Feligioni (Universite d'Aix - Marseille II (FR))
        Slides
      • 14:30
        Search for 4th generation quarks 15m
        We present results of searches for a new heavy 4th generation quark using leptonic, semileptonic and hadrnic final states.The full sample of 5 fb-1 of pp collisions recorded with CMS in 2011 at the center-of-mass energy of 7 TeV has been used.
        Speaker: Dr Sadia Khalil (Kansas State University (US))
        Slides
      • 14:45
        Bootstrap Dynamical Symmetry Breaking with New Heavy Chiral Quarks 15m
        Despite the hint for a 125 GeV Higgs boson, we consider the other option of MH > 600 GeV, noting that the existence of the Higgs boson itself is not yet an established fact. What we do know is that the Goldstone bosons of electroweak symmetry breaking exist as longitudinal components of the weak bosons. The Goldstone boson coupling to a new heavy chiral quark doublet Q (assuming it exist), the G-Q-Q(bar) Yukawa coupling, would now be in the strong coupling regime, given the LHC limit of MQ > 600 GeV is already beyond the perturbative partial-wave unitarity bound. Such strong Yukawa couplings could induce Q-Q(bar) condensation, which might take the role of the Higgs condensate. Guided by a Bethe-Salpeter equation approach, we identify the leading "collapsed state", the (heavy) isotriplet, color singlet "meson", as the Goldstone boson G itself. Viewing G as a very deeply bound state, a "bootstrap" gap equation without a Higgs particle is constructed. Electroweak symmetry breaking via strong Yukawa coupling generates both heavy mass for Q, while self-consistently justifying the keeping of G as a massless Goldstone particle in the loop. We solve such a gap equation, and investigate the mass of heavy quarks in this bootstrap picture, which is found to be not less than a TeV. We consider also a scale-invariant model by Hung and Xiong, in which a massless scalar doublet phi couples strongly with Q, which induces electroweak symmetry breaking. Although a gap equation similar to the one in the bootstrap picture can be written down, we discuss differences with the results of Hung and Xiong, as well as offer a brief critique.
        Speaker: Prof. George Wei-Shu Hou (National Taiwan University (TW))
        Slides
      • 15:00
        Searches for New Physics with CDF Detector 15m
        Searches for physics beyond the standard model are intensively pursued using the full CDF Run II sample. Many among them are pursued in the top-quark sector because it is believed that the top-quark, due to its very large mass, may play a special role in the spontaneous breaking of the electroweak symmetry of the standard model as well as in possible new physics. We present searches for a heavy Z' boson decaying into a top-quark pair in the semi-leptonic decay channel as well as in semi-leptonic decays associated with one and two additional jets; a search for a dark matter candidate particle associated with a single top-quark decaying into the neutrino+jets decay channel and a search of a dark matter candidate particle in events with one jet and large missing transverse energy; and a search for new physics in events with a delayed photon and large missing transverse energy.
        Speakers: Mr Adam Aurisano (Texas A&M University), Adam Aurisano (Unknown), Adam Jude Aurisano
        Slides
      • 15:15
        LHC Signatures Inspired by Yukawa-bound Mesons: Double Resonant WW+jet 15m
        With 5 fb^{-1} LHC data at 7 TeV collected in 2011, current mass limits of the chiral 4th generation quarks have reached 600 GeV, nominally entering the regime of perturbative unitarity violation. The very large Yukawa couplings of these quarks may require nonperturvative treatment, including the possible formation of tightly Yukawa-bound "mesons". Assuming an almost degenerate 4th generation quark doublet (heavy Isospin) and large Higgs-boson mass as required to be consistent with the electroweak precision observables, the spectrum of Yukawa-bound mesons would likely be M(pi_1) < [M(pi_8), M(omega_1)] < M(omega_8), where pi and omega copy from isospin notation, while 1 and 8 in subscript reflect the color of these mesons. The leading production is q\bar{q} --> omega_8, with a rather rich decay phenomenolgy. A possible "double resonance" final state appears where omega_8 decays predominantly into a pi_8 plus a weak boson, followed by the decay of the pi_8 into a weak boson plus a gluon. This unusual final state is realized when the mixing of 4th generation quarks with SM quarks is small, which is consistent with absence of new physics signals from flavor physics. We perform a phenomenological study for the signature at the LHC using the W-jet tagging method, including SM background estimation and demonstration of resonance mass determination. This study also serves as a precursor study for the search for other resonances with the same final state, such as technicolor models with QCD-colored techniquarks.
        Speaker: Dr Hiroshi Yokoya (National Taiwan University (TW))
        Slides
      • 15:30
        Refreshment Break 30m
      • 16:00
        Up-to-date results and upgrade plans of the MEG experiment 15m
        The MEG experiment at the Paul Scherrer Institut (Switzerland) aims at searching for the Lepton-Flavour Violating (LFV) muon decay, mu+ -> e+ gamma, with unprecedented sensitivity. Such decay is forbidden within the Standard Model, nevertheless all its viable extensions predict a branching ratio for this decay in the 10^{-14} to 10^{-12} range. Data collected in 2009 and 2010, which corresponds to a total of 1.8x10^{14} muon decays, allowed us to set the most stringent limit to date on charged LFV (BR(mu->e gamma < 2.4x10{-12} at 90% C.L.). The status of the experiment during the last data taking will be presented together with preliminary analysis of 2011 data. In parallel with the data-taking, the MEG collaboration has recently started to discuss the upgrade plan in order to perform the experiment with three times higher beam intensity and better measurement resolutions, and already started several associated R&D. In addition to the future prospects, the detailed studies of upgrade will also be presented.
        Speaker: Dr Hajime Nishiguchi (KEK (JP))
        Slides
      • 16:15
        Search for $\tau \to \mu/e\, \gamma$ with the full data sample of Belle 15m
        We search for a lepton flavor violating $\tau$ decay into $\mu/e$ and $\gamma$ using the full data sample of approximately 1000 fb$^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider.
        Speaker: Prof. Kiyoshi Hayasaka (Nagoya University (JP))
        Slides
      • 16:30
        Implications of Br(mu to e gamma) and Delta a_mu on Muonic Lepton Flavor Violating Processes 15m
        We study the implications of the experimental results on the mu to e gamma decay rate and the muon anomalous magnetic moment on muonic lepton flavor violating processes, such as mu to 3 e and mu N to e N. We use a model independent approach in this analysis, where these processes are considered to be loop induced by exchanging spin 1/2 and spin 0 particles. We explore two complementary cases, which has no or has internal (built-in) cancellation mechanism in amplitudes. Our main results are as following. (a) Bounds from rates are used to constrain parameters, such as coupling constants and masses. These constraints can be easily updated by simple scalings, if the experimental situations change. (b) The muon g-2 data favors non-chiral interactions. (c) In mu to 3 e and mu N to e N processes, Z-penguin diagrams may play some role, while box diagrams contributions are highly constrained. (d) In the first case (without any built-in cancellation mechanism), using the recent mu to e gamma bound, we find that mu to 3e and mu N to e N rates are bounded below the present experimental limits by two to three orders of magnitudes in general. Furthermore, by comparing Delta a_mu and Br(mu to e gamma) data, the couplings of mu and e are found to be highly hierarchical. Additional suppression mechanism should be called for. (e) In the second case (with a built-in cancellation mechanism), the mu to 3 e rate remains suppressed, but the bounds on mu N to e N rates, implicated from the mu to e gamma bound, can be relaxed significantly and can be just below the present experimental bounds.
        Speaker: Prof. Chun-Khiang Chua (Chung Yuan Christian University (TW))
        Slides
      • 16:45
        An Explicit SU(12) Family and Flavor Unification Model 15m
        An explicit SU(12) unification model with three light chiral families is presented which avoids any external flavor symmetries. The hierarchy of quark and lepton masses and mixings is explained by higher dimensional Yukawa interactions involving Higgs bosons containing SU(5) singlet fields with VEVs appearing at a scale 50 times smaller than the $3 \times 10^{16}$ GeV SU(12) unification scale. The model has been found to be in very good agreement with the observed quark and lepton masses and mixings.
        Speaker: Prof. Carl Albright (Northern Illinois University & Fermi National Accelerator Laboratory (US))
        Slides
      • 17:00
        Search for Lepton Flavour Violation at HERA 15m
        A search for second and third generation scalar and vector leptoquarks produced in ep collisions via the lepton flavour violating processes ep → μX and ep → \tau X is performed by the H1 experiment at HERA. The full data sample taken at a centre-of-mass energy √s = 319 GeV is used for the analysis, corresponding to an integrated luminosity of 245 pb−1 of e+p and 166 pb−1 of e−p collision data. No evidence for the production of such leptoquarks is observed in the H1 data. Leptoquarks produced in e±p collisions with a coupling strength of lambda= 0.3 and decaying with the same coupling strength to a muon-quark pair or a tau-quark pair are excluded at 95% confidence level up to leptoquark masses of 712 GeV and 479 GeV, respectively.
        Speaker: Dr David South (DESY (DE))
        Slides
      • 17:15
        The role of SuperB in unraveling the nature of physics beyond the SM 15m
        Energy frontier searches are continuing to search for signs that set a scale for physics BSM. SuperB is able to measure a broad spectrum of observables that can be used to constrain parameters in the theory of any physics BSM found in the coming years at the LHC. In the event that no discoveries are made, one can use the same observables to constrain both parameter and model space. Deviations from SM expectations, or observation of forbidden processes at SuperB could point the way to new physics at scales beyond the reach of the LHC.
        Speaker: Prof. David Hitlin (California Institute of Technology)
        Slides
      • 17:30
        Production of the exotic $1^{--}$ hadrons $\phi(2170)$, X(4260)$ and $Y_b(10890)$ at the LHC and Tevatron via the Drell-Yan mechanism 15m
        We calculate the Drell-Yan production cross sections and differential distributions in the transverse momentum and rapidity of the $J^{PC}=1^{--}$ exotic hadrons $\phi(2170)$, $X(4260)$ and $Y_b(10890)$ at the hadron colliders LHC and the Tevatron. These hadrons are tetraquark (four-quark) candidates, with a hidden $s\bar{s}$, $c\bar{c}$ and $b\bar{b}$ quark pair, respectively. In deriving the distributions and cross sections, we include the order $\alpha_s$ QCD corrections, resum the large logarithms in the small transverse momentum region in the impact-parameter formalism, and use the state of the art parton distribution functions. Taking into account the data on the production and decays of these vector hadrons from the $e^+e^-$ experiments, we present the production rates for the processes $pp(\bar{p}) \to \phi(2170)(\to \phi(1020) \pi^+\pi^- \to K^+K^- \pi^+\pi^-)+...$, $pp(\bar{p}) \to X(4260)(\to J/\psi \pi^+\pi^- \to \mu^+\mu^-\pi^+\pi^-)+...$, and $pp(\bar{p}) \to Y_b(10890)(\to (\Upsilon(1S), \Upsilon(2S), \Upsilon(3S)) \pi^+\pi^- \to \mu^+\mu^-\pi^+\pi^-)+...$. Their measurements at the hadron colliders will provide new experimental avenues to explore the underlying dynamics of these hadrons.
        Speaker: Prof. Ahmed Ali (DESY (DE))
        Slides
      • 17:45
        Searches for new Physics in multileptons or like-sign leptons with the ATLAS detector 15m
        Events containing several leptons or two like-sign leptons are rarely produced in the Standard Model (SM), but occur with an enhanced rate in many models of new physics. We look for anomalous production of pair of prompt like sign leptons or events with three or more leptons using the full data sample recorded in 2011 at sqrt(s)=7 TeV centre-of-mass energy by the ATLAS experiment at the LHC.
        Speaker: Dr Else Lytken (Lund University (SE))
        Slides
    • 09:00 18:00
      Room 220 - Neutrinos / QCD, Jets, Parton Distributions - TR6 Room 220

      Room 220

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        Recent results of the ANTARES neutrino telescope 15m
        The ANTARES collaboration completed in 2008 the construction of the largest neutrino telescope in the Northern hemisphere. Neutrinos, being neutral, stable and weakly-interacting have unique advantages with respect to other more traditional probes to study the high energy Universe. The scientific scope of ANTARES is very broad, including the observation of astrophysical neutrino sources, the indirect detection of dark matter and more exotic searches likes monopoles or nuclearites. The data gathered in the last years has provided a rich output. In this talk I will overview the most relevant results: the skymap of the Southern neutrino sky, with the best flux limits up to date for most of that region; the limits for dark matter searches in the Sun, which are interpreted in the frameworks of MSSM and mUED; an extensive multi-messenger program, which includes search for correlations with GRBs, micro-quasars, UHE cosmic rays of Auger and grativational waves; searches for monopoles and nuclearites, and the observation of neutrino oscillations (the first time this is measured with a neutrino telescope).
        Speaker: Dr Juan de Dios Zornoza (IFIC (ES))
        Slides
      • 09:15
        Recent results of the atmospheric neutrino analysis in SK 15m
        Super-Kamiokande started its operation in 1996. Since then, more than 3000 days of atmospheric neutrino data has been collected. In the beginning, we have obtained \Delta_m^2_{23} and \theta_{23} with two flavor oscillation using the zenith angle distirbution of observed leptons. Afterwards, we have extracted L/E distribution from observed quantities to deduce the oscillation parameters. Continuous efforts to understand the data samples, it is possible for us to use not only the single ring events but multiple ring events and energetic events. Also, electronics upgrade in 2008 expands the dynamic range of charge measurements and improves the detection efficiency of electrons from the muon decays. As a result, we can perform more precise analysis of neutrino oscillation parameters, like three flavor oscillation analyses to study the value of \theta_{13}, mass hierarchy problem, CP violation, possible non-standard interactions of neutrino and so on. Especially, recent measurements of \theta_{13} from the accelerator and reactor experiments are complementary to the results from the atmospheric neutrino analysis. In this presentation, we will report the latest results from the oscillation analysis using the atmospheric neutrino samples in Super-Kamiokande.
        Speaker: Dr Yoshinari Hayato (Kamioka observatory ICRR University of Tokyo (JP))
        Slides
      • 09:30
        Status of the Gadolinium project for Super-Kamiokande 15m
        EGADS (Evaluating Gadolinium's Action on Detector Systems) is a test facility for a new neutrino detection method using a gadolinium-loaded water Cherenkov detector. In this method, events due to anti-neutrino charged-current interactions on protons (i.e., inverse beta decay) are identified by the coincident detection of a prompt positron signal and a delayed gamma-ray signal from neutron capture on gadolinium [Gd] sulfate which is dissolved in the water. By introducing this method to a large water Cherenkov detector such as Super-Kamiokande we expect to achieve the first detection of the supernova relic neutrinos. EGADS consists of a cylindrical stainless steel tank holding 200 tons of dissolved Gd solution (0.2% by mass), two hundred forty 20-inch PMTs, and special water circulation systems for pre-treatment, filtration, and gadolinium recovery. It is designed to evaluate the impact of dissolving Gd sulfate on water transparency and detector materials. In 2011 and 2012, we tested the performance of water circulation system with a 15 ton buffer tank. In the second half of 2012 we will install PMTs in the 200 ton tank and start detector commissioning with our DAQ. The current status of EGADS will be presented.
        Speaker: Dr Yano Takatomi (Okayama University (JP))
        Slides
      • 09:45
        Solar neutrino results from Super-Kamiokande 15m
        Recent results of the Super-Kamiokande (SK) solar neutrino measurements are presented. The main goal of SK's solar analysis is to observe the MSW effect, i.e. a solar neutrino energy spectrum distortion induced by matter in the Sun, and a day/night solar neutrino flux asymmetry induced by matter in the Earth. Thanks to the improvement of the detector's water circulation system, low energy background levels have been reduced and clear solar neutrino signals are seen even for 4.0-4.5MeV electron kinetic energy range, along with some indications of a signal even down to 3.5-4.0MeV. The combined energy spectrum and day/night solar neutrino flux from phase I to phase IV in SK will be presented. A global oscillation analysis has been carried out using SK-I, II, III, and IV data and combining these results with the results of other solar neutrino experiments as well as the KamLAND reactor experiment. The results of this global analysis will also be presented.
        Speaker: Dr Yusuke Koshio (Kamioka observatory ICRR University of Tokyo (JP))
        Slides
      • 10:00
        Neutrino physics with Borexino 15m
        Borexino is a large-volume liquid scintillator detector installed in the underground halls of the Laboratori Nazionali del Gran Sasso in Italy. After several years of construction, the Borexino phase I ended after about 3 years of data taking and a period of purification of the scintillator. All Borexino results within its solar neutrino program and their physical implications will be reviewed: the first real time measurement of the 7Be solar neutrino interaction rate, obtained with a precision below 5%, and the absence of its day-night asymmetry with 1.4% precision; the first direct evidence of the pep neutrino signal and the strongest experimental constraint of the CNO solar neutrino flux to date; the measurement of the solar 8B neutrino rate with 3 MeV energy threshold. Borexino has also made sensitive measurements of antineutrinos, both terrestrial (geoneutrinos) and astrophysical, setting the best limits on a hypothetical antineutrino flux from the Sun assuming undistorted 8B spectrum. Along with sensitive searches for exotic processes, Borexino is now preparing to make a precise time-of-flight measurement of neutrinos from the CNGS beam. If available at the time of the ICHEP2012 conference, new results concerning the neutrino speed and/or update of the geo-neutrino measurement could be presented.
        Speaker: Dr Livia Ludhova (INFN Milano (IT))
        Slides
      • 10:15
        Prospects of investigating reactor neutrino anomaly with 3-16 m baseline 15m
        Results from reactor neutrino experiments show a repeating pattern of a small constant deficit at baselines between 16 m and 1-2 km as described in the paper by Mention et al. Proposed explanation of the deficit is so called reactor neutrino anomaly that requires existence of a non-standard neutrino oscillation with a very short baseline. Convincing independent confirmation of this result can come from the observation of the same pattern in the large liquid scintillator detector with the radioactive anti-neutrino source in the 100 kCi range as suggested by Cribier et al. In this talk we will investigate potential for the reactor neutrino anomaly measurement with the highly radioactive anti-neutrino source deployed in the veto region of the KamLAND detector with oscillation baseline between 3 and 16 m.
        Speaker: Dr Jelena Maricic (Drexel University (US))
        Slides
      • 10:30
        Refreshment Break 30m
      • 11:00
        Diffractive cross sections at HERA 15m
        A combination of the inclusive diffractive cross section measurements made by the H1 and ZEUS Collaborations at HERA is presented. The analysis uses diffractive deep inelastic scattering data measured by means of proton spectrometers. Correlations of systematic uncertainties are taken into account by the combination method, resulting in improved precision. The combined data cover the range 2.5 < Q2 < 200 GeV2 in photon virtualities, 0.00035 < xIP < 0.09 in fractional momentum losses, 0.09 < |t| < 0.55 GeV2 in four momentum transfer at the proton vertex and 0.0018 < beta < 0.56 in beta = x/xIP, where x is the Bjorken scaling variable. The reduced cross section in diffractive deep inelastic scattering ep events was measured with the ZEUS detector at HERA, using two different centre-of-mass energies, 318 and 225 GeV. The diffractive events, gamma* p-> Xp, were selected requiring a large rapidity gap between the hadronic system X and the outgoing proton. The measurement covers an unexplored range of y, the inelasticity of the interaction. The diffractive process ep → eXY , where Y denotes a proton or its low mass excitation with MY < 1.6 GeV, is studied with the H1 experiment at HERA. The analysis is restricted to the phase space region of the photon virtuality 3 ≤ Q2 ≤ 1600 GeV2, the square of the four-momentum transfer at the proton vertex |t| < 1.0 GeV2 and the longitudinal momentum fraction of the incident proton carried by the colourless exchange xIP < 0.05. Triple differential cross sections are measured as a function of xIP , Q2 and β = x/xIP where x is the Bjorken scaling variable. These measurements are made after selecting diffractive events by demanding a large empty rapidity interval separating the final state hadronic systems X and Y . High statistics measurements covering the data taking periods 1999-2000 and 2004-2007 are combined with previously published results in order to provide a single set of diffractive cross sections from the H1 experiment using the large rapidity gap selection method. The combined data represent a factor between three and thirty increase in statistics with respect to the previously published results. The mea- surements are compared with predictions from NLO QCD calculations based on diffractive parton densities and from a dipole model. The proton vertex factorisation hypothesis is tested. First measurements are presented of the diffractive cross section σ_ep→eXY at centre-of-mass energies √s of 225 and 252 GeV, together with a precise new measurement at √s of 319 GeV, using data taken with the H1 detector in the years 2006 and 2007. Together with previous H1 data at √s of 301 GeV, the measurements are used to extract the diffractive longitudinal structure function FLD in the range of photon virtualities 4.0 ≤ Q2 ≤ 44.0 GeV2 and fractional proton longitudinal momentum loss 5 · 10−4 ≤ x_IP ≤ 3 · 10−3. The measured FLD is compared with leading twist predictions based on diffractive parton densities extracted in NLO QCD fits to previous measurements of diffractive Deep-Inelastic Scattering and with a model which additionally includes a higher twist contribution derived from a colour dipole approach. The ratio of the diffractive cross section induced by longitudinally polarised photons to that for transversely polarised photons is extracted and compared with the analogous quantity for inclusive Deep-Inelastic Scattering. The cross section for the diffractive deep-inelastic scattering process ep → eXp is measured, with the leading final state proton detected in the H1 Forward Proton Spectrometer. The data sample covers the range x_IP<0.1 in fractional proton longitudinal momentum loss, 0.1 < |t| < 0.7 GeV2 in squared four-momentum transfer at the proton vertex and 4 < Q2 < 700 GeV2 in photon virtuality. The cross section is measured four-fold differentially in t, x_IP , Q2 and β = x/x_IP , where x is the Bjorken scaling variable. The t and x_IP dependences are interpreted in terms of an effective pomeron trajectory and a sub-leading exchange. The data are compared to perturbative QCD predictions at next-to-leading order based on diffractive parton distribution functions previously extracted from complementary measurements of inclusive diffractive deep-inelastic scattering. The ratio of the diffractive to the inclusive ep cross section is studied as a function of Q2, β and xIP .
        Speaker: Dr David Salek (CERN (CH))
        Slides
      • 11:15
        Dijet Production in Diffractive Deep-Inelastic Scattering using Proton Spectrometers at HERA 15m
        The cross section of diffractive deep-inelastic scattering ep → eXp is measured, where the system X contains at least two jets and the leading final state proton is detected in the H1 Forward Proton Spectrometer. The measurement is performed for fractional proton longitudinal momentum loss x_IP < 0.1 and covers the range 0.1 < |t| < 0.7 GeV^2 in squared four-momentum transfer at the proton vertex and 4 < Q^2 < 110 GeV^2 in photon virtuality. The differential cross sections extrapolated to |t| < 1 GeV^2 are in agreement with next-to- leading order QCD predictions based on diffractive parton distribution functions extracted from measurements of inclusive and dijet cross sections in diffractive deep-inelastic scattering. The data are also compared with leading order Monte Carlo models. The production of dijets in diffractive deep inelastic scattering, ep -> e gamma* p -> e p jet1 jet2 X, has been measured with the H1 detector at HERA using Very Forward Proton Spectrometer to measure the scattered proton momentum. The data correspond to an integrated luminosity of 95 pb^-1. This process is sensitive to the partonic structure of the diffractive exchange between the proton and the virtual photon. The scattered proton is measured using the VFPS with an acceptance of about 90% in the range 0.009 < x_pom < 0.025, where x_pom is the energy fraction lost by the proton in the interaction. The dijet cross section has been measured for virtualities of the exchanged boson, 5 < Q^2 < 80 GeV^2 and photon-proton centre-of-mass energies, 100 < W < 250 GeV and |t| < 1 GeV^2. The jets were identified using the inclusive k_T algorithm in the gamma* p frame. The two highest transverse energy jets identified in each event were required to satisfy E*_{T, jet} > 5.5 and 4 GeV, respectively in the pseudorapidity range -2.0 < eta_{jet} < 2. The cross sections are compared to the predictions from leading-logarithm parton-shower RapGap Monte Carlo and next-to-leading-order QCD calculations based on recent diffractive parton densities extracted from inclusive diffractive deep inelastic scattering data.
        Speaker: Dr Richard Polifka (Charles University in Prague (CZ) & University of Toronto (CA))
        Slides
      • 11:30
        Measurements of the elastic cross section and of the single diffractive cross section in ppbar scattering at sqrt(s)=1.96 TeV 15m
        We present two measurements of cross sections using the data recorded at the Fermilab Tevatron collider with the forward proton spectrometer(s) of the D0 detector. First we discuss a measurement of the differential distribution dsigma/dt for the elastic cross section in the range 0.26<|t|<1.2 GeV^2. Next we discuss a measurement of the differential cross section for the single diffractive process in a similar range of |t|.
        Speaker: Prof. Vladislav Simak (Czech Technical University Prague (CZ))
        Slides
      • 11:45
        Forward Physics Results from CMS. 15m
        We report on the latest soft and semi-hard QCD measurements in p-p collisions at the LHC including: (i) measurement of the total inelastic cross section, (ii) inclusive identified charged-hadron pT spectra, (iii) underlying event and constraints on models of multi-parton interactions, and (iv) characteristics of jet radiation as a function of pseudorapidity.
        Speaker: Mr Gilvan Augusto Alves (Centro Brasileiro de Pesquisas Físicas (BR))
        Slides
      • 12:00
        ATLAS studies of diffraction, soft particle production and double parton scattering 15m
        Soft and semi-hard QCD studies made with ATLAS are presented. These include measurement of the inelastic and diffractive cross sections, mean forward energy flow, forward-backward and azimuthal correlations, azimuthal ordering of hadron production, event shapes, and identified strange particle production. Distributions sensitive to the underlying event are measured in a variety of hard processes. In addition, an explicit study of double-parton scattering using W+dijet events is presented, along with a measure of the effective cross section. Many of these measurements are used to develop and tune models for soft particle production. An overview of these results is given.
        Speaker: Mr Tim Martin (University of Birmingham (GB))
        Slides
      • 12:15
        New measurements of forward physics in the TOTEM experiment at the LHC 20m
        The TOTEM experiment recently measured the elastic proton rates dN/dt down to –t=0.02 GeV^2 at the LHC energy of \sqrt s = 7 TeV. In addition, the accompanying inelastic rates were recorded with the forward telescopes for 5.3 < |eta| < 6.4. The optical theorem allowed for first luminosity independent total cross-section measurement at \sqrt s = 7 TeV energy. Moreover, the total pp cross-section was obtained in two additional ways, as a quantity dependent on the CMS luminosity. It was calculated with optical theorem solely from the differential elastic cross-section as well as expressed as a direct sum of the elastic and inelastic contributions. Finally, the estimates of total cross-section obtained from data with small and large bunch populations were compared. The different methods agree very well within their errors. Attempts are made to identify the individual components of the inelastic cross-section. Moreover, TOTEM measured the very forward charged particle distributions dN/d_eta for 5.3 < |eta| < 6.4, which significantly extend the measurements of the other LHC experiments. The obtained results disagree with the key Monte Carlo generators.
        Speaker: Dr Hubert Niewiadomski (CERN (CH))
        Slides
      • 12:35
        Lunch Break 1h 25m
      • 14:00
        Studies of soft QCD at LHCb 15m
        Due to its unique pseudorapidity coverage and the possibility of extending the measurements to low transverse momenta, LHCb provides important input to the understanding of particle production and energy flow in a kinematical range where QCD models have large uncertainties. Measurements of charged, strange and charmed particle production are compared to predictions. In addition, studies of the energy flow probe the underlying event which is modeled in different ways by several Monte Carlo event generators.
        Speaker: Dr Raluca Muresan (Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
        Slides
      • 14:15
        Exclusive and diffractive physics results from CMS 15m
        We report on the latest CMS measurements of exclusive and diffractive production of dijets, dimuons, dielectrons and diphotons in pomeron- and photon-induced collisions in p-p at 7 TeV. The data are compared to various theoretical predictions.
        Speaker: Dr Robert Ciesielski (Rockefeller University (US))
        Slides
      • 14:30
        Photon results from CDF. 15m
        Prompt isolated photon pairs production cross sections, as well as direct photon production in association with a heavy (b or c) quark jets are presented. Differential cross sections are presented as a function of several variables. The results are compared with a next-to-leading order perturbative QCD calculations.
        Speaker: Konstantinos Vellidis (Fermi National Accelerator Laboratory (US))
        Slides
      • 14:45
        Measuremetns of the diphoton and of the photon + b-jet differential production cross sections in ppbar collisions at sqrt(s)=1.96 TeV 15m
        We present measurements of the differential cross sections for the production of photon pairs and for the production of b-jets in association with photons in ppbar collisions at sqrt(s)=1.96 TeV using data recorded with the D0 detector at the Fermilab Tevatron collider and corresponding to an integrated luminosity of 8.7 fb-1. Results are compared with the prediction of NLO QCD calculations and with the predictions of Monte Carlo event generators.
        Speaker: Dr Peter Svoisky (University of Oklahoma (US))
        Slides
      • 15:00
        Refreshment Break 1h
      • 16:00
        Production and properties of heavy flavors at CDF 15m
        We present new results on the measurements of properties of heavy hadron production and decay at CDF. These include the first three-dimensional determination of the Upsilon meson spin alignment, the first measurement of the Bc meson lifetime in an exclusive final state, and a study of the phenomenology of charged charmed meson fragmentation.
        Speaker: Dr Sinead Farrington (University of Warwick (UK))
        Slides
      • 16:15
        Heavy quark production in DIS at HERA 15m
        The production of beauty quarks in ep interactions has been studied with the ZEUS detector at HERA for exchanged four-momentum squared Q^2 > 10 GeV2, using an integrated luminosity of 363 pb-1. The beauty events were identified using electrons from semileptonic b decays with a transverse momentum 0.9 < p_T^e < 8 GeV and pseudorapidity |eta^e| < 1.5. Cross sections for beauty production were measured and compared with next-to-leading-order QCD calculations. The beauty contribution to the proton structure function F_2 was extracted from the double-differential cross section as a function of Bjorken-x and Q^2. Measurements of cross sections for events with charm and beauty jets in deep inelastic scattering at HERA are presented. Events with jets of transverse energy E_T^ jet > 6 GeV and pseudorapidity −1.0 < ηjet < 1.5 in the laboratory frame are selected in the kinematic region of photon virtuality Q2 > 6 GeV2 and inelasticity variable 0.07 < y < 0.625. Measurements are also made requiring a jet in the Breit frame with E_T^∗jet > 6 GeV. The data were collected with the H1 detector in the years 2006 and 2007 corresponding to an integrated luminosity of 189 pb−1. The numbers of charm and beauty jets are determined using variables reconstructed using the H1 vertex detector with which the impact parameters of the tracks to the primary vertex and the position of secondary vertices are measured. The measurements are compared with QCD predictions and with previous measurements where heavy flavours are identified using muons.
        Speaker: Dr Alessandro Bertolin (INFN Padova (IT))
        Slides
      • 16:30
        Heavy quark photoproduction at HERA 15m
        Photoproduction of beauty and charm quarks in events with at least two jets has been measured with the ZEUS detector at HERA using an integrated luminosity of 133 pb-1 The fractions of jets containing b and c quarks were extracted using the invariant mass of charged tracks associated with secondary vertices and the decay-length significance of these vertices. Differential cross sections as a function of jet transverse momentum, pT jet, and pseudorapidity, etajet, were measured. The data are compared with previous measurements and are well described by next-to leading-order QCD predictions. The cross section of b bar{b} photoproduction in ep collisions is measured with the H1 detector at HERA. Events containing b-quarks are identified through detection of two low momentum electrons in the final state. Semileptonic decays b bar{b} -> ee X are exploited in the kinematic range of the photon virtuality Q^2 < 1 GeV^2, the inelasticity 0.2 < y < 0.8 and the pseudorapidity of the b-quarks |eta(b), eta(bar{b})| < 2. The differential b-quark production cross section is measured as a function of the transverse b-quark momentum and extends the previously experimentally accessible phase space towards the b-quark production threshold. The results are compared to other b-quark cross section measurements, as well as to QCD predictions. Measurements of cross sections for beauty and charm events with dijets and a muon in photoproduction at HERA are presented. Events with dijets of transverse momentum P_T^jet1> 7 GeV and P_T^jet2> 6 GeV in the pseudorapidity range −1.5 < ηjet < 2.5 in the laboratory frame are selected in the kinematic region of Q2 < 2.5 GeV2 and inelasticity 0.2 < y < 0.8. One of the two selected jets must be associated to a muon with PTμ> 2.5 GeV in the pseudorapidity range −1.3 < ημ< 1.5. The data were collected with the H1 detector in the years 2006 and 2007 corresponding to an integrated luminosity of 179 pb−1. The fraction of beauty and charm events is determined using variables reconstructed with the H1 vertex detector, which measures the impact parameters of the muon tracks with respect to the primary vertex. In addition, the variable P_T^rel, the relative transverse momentum of the muon with respect to the axis of the associated jet, is used to determine the beauty and charm content of the events. The measurements are compared with QCD predictions at leading and next-to-leading order and are found to be reasonably well described.
        Speaker: Dr Michel Sauter (Universität Heidelberg (DE))
        Slides
      • 16:45
        Heavy flavor and vector bosons associate production 15m
        The mechanism of production of heavy-flavoured mesons, containing b or c quarks, in association with vector bosons, W or Z, in the Standard Model is only partially understood. The study of events with one or two well-identified and isolated leptons accompanied by b-jets or secondary vertices is therefore crucial to refine the theoretical calculations in perturbative QCD, as well as validate associated Monte Carlo techniques. The deep understanding of these processes is furthermore required by Higgs and BSM analyses with similar final states. Using the LHC proton-proton collision data collected in 2010 and 2011 at a centre of mass energy of 7 TeV by the CMS detector, preliminary measurements of the Z+b(b) cross sections and angular correlations are presented. Finally, the study of the W+c production rate with respect to the W charge and W+light jets rates allows to probe the strange quark content of the proton. These results are also presented.
        Speaker: Dr Simon Marie E De Visscher (Universität Zürich (CH))
        Slides
      • 17:00
        Inclusive production of Beauty and Charm 15m
        The production of charm and beauty in pp collisions at 7 TeV has been studied with the ATLAS detector using fully reconstructed D^(*) mesons. The beauty production cross-sections have been obtained using events with a D^* and a muon in the final state. The results are compared with the NLO QCD predictions
        Speaker: Dr James Catmore (CERN (CH))
        Slides
      • 17:15
        Charm production in DIS at HERA 15m
        Charm production has been measured with the ZEUS detector in deep inelastic ep scattering at HERA. The measurement is based on the full reconstruction of the decay chain D*->D0pis, D0->Kpi and exploits the full HERA II statistics. Differential cross sections have been measured. The kinematic range is 1.5 GeV < pT(D*) < 10GeV, |eta(D*)| < 1.5, 5 < Q2 < 1000GeV2 and 0.02 < y < 0.7. The observed cross sections is extrapolated to the full pt(D*) and eta(D*) range in order to determine the open-charm contribution, F2cc(x,Q2) to the proton structure function, F2. Charm production in deep inelastic scattering has been measured with the ZEUS detector using the full HERA II data set. The charm content in events with a jet has been extracted using the decay length significance and invariant mass of secondary vertices. Differential cross sections as a function of Q2, Bjoerken x, ET(jet) and eta(jet) were measured and compared to theoretical predictions. The open charm contribution to the proton structure function F2 was extracted from double differential cross sections. The production of D*, D+, D0, Ds and Lambda_c charm hadrons and their antiparticles in ep scattering at HERA was studied with the ZEUS detector using the full HERA II data set. The measurement has been performed in the photoproduction regime. The fractions of c quarks hadronising as a particular charm hadron, f(c -> D, Lambda_c), were derived in the visible kinematic range. The obtained fractions can be compared to previous results from HERA and to measurements from e+e- experiments. The inclusive photoproduction of D∗ mesons and of D∗-tagged dijets is investigated with the H1 detector at the ep collider HERA. The kinematic region covers small photon virtualities Q2 < 2 GeV2 and photon-proton centre-of-mass energies of 100 < Wγp < 285 GeV. Inclusive D∗ meson differential cross sections are measured for central rapidities |η(D∗)| < 1.5 and transverse momenta pT (D∗) > 1.8 GeV. The heavy quark production process is further investigated in events with at least two jets with transverse momentum pT (jet) > 3.5 GeV each, one containing the D∗ meson. Differential cross sections for D∗-tagged dijet production and for correlations between the jets are measured in the range |η(D∗)| < 1.5 and pT (D∗) > 2.1 GeV. The results are compared with predictions from Monte Carlo simulations and next-to-leading order perturbative QCD calculations. Inclusive production of D* mesons in deep-inelastic ep scattering at HERA is studied in the range5 < Q2 < 100GeV2 of the photon virtuality and 0.02 < y < 0.7 of the inelasticity of the scattering process. The observed phase space for the D* meson is pT (D*) > 1.25 GeV and |η(D*)| < 1.8. The data sample corresponds to an integrated luminosity of 348 pb−1 collected with the H1 detector. Single and double differential cross sections are measured and the charm contribution F_2cc to the proton structure function F_2 is determined. The results are compared to perturbative QCD predictions at next-to-leading order implementing different schemes for the charm mass treatment and with Monte Carlo models based on leading order matrix elements with parton showers.
        Speaker: Dr Achim Geiser (DESY)
        Slides
      • 17:30
        Analysis of CCQE Neutrino Interactions in a Liquid Argon Time Projection Chamber (LArTPC) 15m
        The Argon Neutrino Test, ArgoNeuT, is a small scale Liquid Argon Time Projection Chamber(LArTPC). ArgoNeuT, an R&D project paving the way for construction of larger detectors, was located 350 feet underground and ran upstream of the MINOS detector in the NuMI beam at Fermi National Accelerator Laboratory from September 2009 to February 2010. ArgoNeuT provides bubble-chamber-like quality images for excellent particle ID and background rejection. ArgoNeuT provides a sample of neutrino events in a LArTPC for the first time in the U.S. and the first time ever in a low-energy beam of 0.1 to 10 GeV. Analysis of ArgoNeuT's Charged Current Quasi-Elastic (CCQE) neutrino sample, in which a neutrino interacts with a neutron and the final state particles are a proton and a muon, will be presented. Vertex activity and calorimetric reconstruction will be addressed for this class of events.
        Speaker: Ms Kinga Partyka (Yale University)
      • 17:45
        . 15m
    • 11:00 19:30
      Teacher Development Day David Caro Building, The University of Melbourne

      David Caro Building, The University of Melbourne

    • 17:45 19:00
      Public Lecture Spot (The University of Melbourne)

      Spot

      The University of Melbourne

    • 09:00 18:00
      Plenary 3 - The Standard Model - TR1 Plenary 3

      Plenary 3

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        Search for SM Higgs decaying to tau tau at CMS 15m
        Results are presented on the search for the standard model Higgs boson decaying into two tau leptons, using both leptonic and hadronic decays of the tau. The sample are split into various categories to enhance the search sensitivity. The full data sample of 4.7 fb-1 of pp collisions collected in 2011 with the CMS experiment at a CM energy of 7 TeV have been analyzed, as well as a significant fraction of the 2012 luminosity delivered so far at the new energy of 8 TeV.
        Speaker: Mr Joshua James Swanson (University of Wisconsin (US))
        Slides
      • 09:15
        Search for the Standard Model Higgs boson in the H ->tautau decay mode with the ATLAS detector 15m
        A Higgs boson search in the H-> tau^+ tau^- decay mode has been performed using proton-proton collision data recently collected with the ATLAS detector at the Large Hadron Collider. The search was performed in the mass range of 100-150 GeV. Upper limits on the cross-section times branching ratio are derived.
        Speaker: Dr Swagato Banerjee (University of Wisconsin (US))
        Slides
      • 09:30
        Searches for the Higgs boson in final states with photons or taus in ppbar 15m
        We present the result of two searches for the standard model Higgs boson using the Run 2 data sample collected with the D0 detector at the Fermilab Tevatron collider at a center of mass energy sqrt(s)=1.96 TeV. In the first search the Higgs boson is searched for in final states with two high transverse momentum photons, exploiting in addition to the diphoton invariant mass spectruim a large number of other kinematic variables via a multivariate technique. This search is also interpreted in the framework of fermiophobic Higgs boson models. In the second search we consider final states with a lepton (e or mu), a tau (identified via its hadronic decays), and analyze separately events with no jets, exactly one jet and two or more jets. These different final states are sensitive to all dominant Higgs boson production modes and probe the Higgs coupling to tau leptons.
        Speaker: Prof. Paul Grannis (Stony Brook University)
        Slides
      • 09:45
        Standard Model Higgs boson searches in secondary channels using the full CDF dataset 15m
        Although the sensitivity to a low-mass Standard Model Higgs boson at the Fermilab Tevatron is highest for the primary search channels ($H\to b\bar{b}$ decay in association with a vector boson and H-WW), other channels contribute significantly to the combined Higgs search sensitivity. We report the results of searches for the Higgs boson produced in association with a top quark pair with the $H\to b\bar{b}$ decay, and also searches in the inclusive diphoton and ditau final states using up to 10~fb$^{-1}$ of integrated luminosity collected by the CDF detector at $\sqrt{s}=1.96$ TeV. Despite their challenges, when combined, these secondary channels contribute appreciably to the low-mass Higgs boson sensitivity at the Tevatron.
        Speaker: Dr Elisabetta Pianori (University of Warwick (UK))
        Slides
      • 10:00
        Search for the Standard Model Higgs boson through the H->ZZ->(llvv,llqq) decay channels with the ATLAS detector 15m
        The search for the Standard Model Higgs boson via its decays into two Z bosons is presented, based on the proton-proton collisions recorded recently by the ATLAS experiment at the LHC. For Higgs boson masses above 200 GeV, the sensitivity is substantially enhanced by using channels in which one of the Z bosons decays into neutrinos or quarks. With the current integrated luminosity, a wide mass range is excluded at the 95% confidence level.
        Speaker: Dr Carl Bryan Gwilliam (University of Liverpool (GB))
        Slides
      • 10:15
        Search for SM Higgs decaying to ZZ to ll qq or ll vv at CMS 15m
        Results are presented on the search for the standard model Higgs boson decaying into two Z bosons, with one boson decaying into a pair of charged leptons, either muons or electrons, and the other boson decaying in neutrinos or jets. The full data sample of 4.7 fb-1 of pp collisions collected in 2011 at a CM energy of 7 TeV with the CMS experiment have been analyzed, as well as a significant fraction of the 2012 luminosity delivered so far at the new energy of 8 TeV.
        Speaker: Dr Francesco Pandolfi (ETH Zürich (CH))
        Slides
      • 10:30
        Refreshment Break 30m
      • 11:00
        Search for SM Higgs decaying to ZZ to four leptons at CMS 15m
        Results are presented on the search for the standard model Higgs boson decaying into two Z bosons, with each boson decaying into a pair of charged leptons, either muons, electrons or taus. The full data sample of 4.7 fb-1 of pp collisions collected in 2011 at a CM energy of 7 TeV with the CMS experiment have been analyzed, as well as a significant fraction of the 2012 luminosity delivered so far at the new energy of 8 TeV.
        Speaker: Mr Markus Klute (Massachusettes Institute of Technology)
        Slides
      • 11:15
        Search for the Standard Model Higgs boson in the H->ZZ*->4l decay channel with the ATLAS detector 15m
        A search for the Standard Model Higgs boson in the decay channel H -> ZZ* -> l+l-l+l- where l= (e, mu) is performed, based on the proton-proton collision data at recorded recently with the ATLAS detector. Upper limits are derived on the cross section of a Standard Model Higgs boson with a mass between 110 GeV and 600 GeV.
        Speaker: Dr Konstantinos Nikolopoulos (University of Birmingham (GB))
        Slides
      • 11:30
        Search for the Standard Model Higgs boson in the H->WW->lvlv, lvqq decay modes with the ATLAS detector 15m
        A Higgs boson search in the H->WW (lvlv, lvqq) decay mode has been performed using proton-proton collisions recently recorded by the ATLAS detector. The search in the final state with two leptons and two neutrinos covers a broad mass range from 110 - 600 GeV. Upper limits are derived on the cross section of a Standard Model Higgs boson.The semi-leptonic final state with a lepton, neutrino and two or more jets provides additional sensitivity to the fully-leptonic decay mode in the high mass region from 300 to 600 GeV. Upper limits are derived on the cross section of a Standard Model Higgs boson.
        Speaker: Dr Biagio Di Micco (CERN)
        Slides
      • 11:45
        Search for SM Higgs decaying to WW to lvlv and lvqq at CMS 15m
        Results are presented on the search for the standard model Higgs boson decaying into two W bosons, with at least one W boson decaying into a charged lepton and a neutrino. Several classes of events with zero to two or more jets are analysed separately. Associated production of the Higgs with a Z or W is discussed as well. The full data sample of 4.7 fb-1 of pp collisions collected in 2011 with the CMS experiment at a CM energy of 7 TeV have been analyzed, as well as a significant fraction of the 2012 luminosity delivered so far at the new energy of 8 TeV.
        Speaker: Dr Emanuele Di Marco (California Institute of Technology (US))
        Slides
      • 12:00
        Inclusive Search for Standard Model Higgs Boson Production in the WW Decay Channel using the CDF II Detector 15m
        The search for the Standard Model (SM) Higgs boson at the Tevatron has been highly successful in driving the first Higgs exclusions since LEP. This search by CDF is performed using the full Run2 dataset and looks specifically in the Higgs to WW final state of two charged leptons ($e,\mu$) and two neutrinos from the collision of $p-\bar{p}$ pairs at $\sqrt{(s)} = 1.96$ TeV. This version of the analysis implements several improvements. Track and calorimeter isolation quantities for the leptons were recalculated to prevent mutual spoilage when two candidates are in close proximity to each other. To maximize signal acceptance, events with same-sign dileptons and trileptons are included as separate regions to account for associated Higgs production with a Z or W boson via vector boson fusion. Additionally, events with low dilepton invariant mass are included in a separate region to further improve acceptance. The search excludes at the 95\% C.L. a SM Higgs boson in the mass range between 148 GeV/c^2 and 175 GeV/c^2 and is also one of the main contributors to the Tevatron's sensitivity to the low mass SM Higgs boson.
        Speaker: Mr Massimo Casarsa (INFN - Trieste)
        Slides
      • 12:15
        Searches for the Higgs boson decay in W boson pairs in ppbar collisions at sqrt(s)=1.96 TeV 15m
        We present searches for a standard model Higgs boson decaying into W boson pairs and produced either via the gluon fusion process or in association with an additional W or Z boson. Different decay topologies are considered, exploiting both leptonic and hadronic decays of the W boson. The final states considered are two leptons, both with equal and opposite charges, final states with three or more leptons, and final states in which one or two of the W bosons decay into jet pairs. These decay channels are used to cover the entire mass region between 120 and 200 GeV. Data corresponding to the entire Run 2 sample collected with the D0 detector at the Fermilab Tevatron collider are used in these searches.
        Speaker: Dr Abid Patwa (Brookhaven National Laboratory (BNL))
        Slides
      • 12:30
        Lunch Break 1h 30m
      • 14:00
        Search for SM Higgs decaying to bb at CMS 15m
        Results are presented on the search for the standard model Higgs decaying into two b-quark jets, using associated production of the Higgs with W and Z bosons decaying to leptons. The full data sample of 4.7 fb-1 of pp collisions collected in 2011 with the CMS experiment at a CM energy of 7 TeV have been analyzed, as well as a significant fraction of the 2012 luminosity delivered so far at the new energy of 8 TeV.
        Speaker: Dr David Lopes-Pegna (Princeton University (US))
        Slides
      • 14:15
        Search for the Standard Model Higgs boson produced in association with a vector boson and decaying to a b-quark pair with the ATLAS detector at the LHC 15m
        The results of the ATLAS search for the Standard Model Higgs boson in the mass range 110 < mH < 130 GeV with the Higgs boson produced in association with a W or Z boson and decaying to a b-quark pair are presented. The search is performed in a dataset of proton-proton collisions recently recorded by the ATLAS experiment at the LHC.
        Speaker: Dr Giacinto Piacquadio (CERN)
        Slides
      • 14:30
        Search for the associated production of W/Z and Higgs bosons in final states with b quark pairs in ppbar collisions at sqrt(s)=1.96 TeV 15m
        We present searches for a low mass standard model Higgs boson produced in association with a W or a Z boson at a center of mass energy sqrt(s)=1.96 TeV with the D0 detector at the Fermilab Tevatron collider. The search is performed iin the full D0 Run2 data sample using the leptonic decay channels of the W and the Z boson (W--->lv, Z--->ll and Z--->vv) leading to signatures with one lepton and an imbalance in the transverse energy, or two leptons, or just a large imbalance in the transverse energy, in association with one or two b-tagged jets. We present a search for a low mass Standard Model Higgs boson produced in association with a Z boson decaying invisibly into a pair of neutrinos at a center-of-mass energy of sqrt(s)=1.96 TeV with the D0 detector at the Fermilab Tevatron collider. A significant signal contribution also arises from associated WH production with a leptonic W boson decay in which the charged lepton is not identified. The search is performed in events containing a large imbalance in the transverse energy, and one or two b-tagged jets and uses the full D0 Run 2 dataset. This channel is one of the most powerful ones in the search for a low mass Higgs boson at the Tevatron, but it is experimentally challenging due to the large QCD backgrounds and absence of visible leptons in the final state. We present a search for a low mass Standard Model Higgs boson produced in association with a Z boson decaying to charged leptons at a center-of-mass energy of sqrt(s)=1.96 TeV with the D0 detector at the Fermilab Tevatron collider. The search is performed in events containing two opposite-sign leptons (electron or muon) and one or two b-tagged jets and uses the full D0 Run 2 dataset. The reconstruction of a leptonic Z boson and the fully constrained kinematics provide powerful experimental handles to both suppress backgrounds and improve the dijet mass reconstruction, making this a very important channel in the search for a low mass Higgs boson at the Tevatron.
        Speaker: Dr Satish Desai (Fermilab)
        Slides
      • 14:45
        Direct searches for the standard model Higgs boson produced in association with a vector boson 15m
        We present the results of searches for the standard model Higgs boson at CDF in final states with bottom quarks. Results are derived from the complete Tevatron Run II dataset, with a measured integrated luminosity of 9.5/fb of proton-antiproton data. The searches are performed for assumed Higgs masses between 90 and 150 GeV, for Higgs bosons produced in association with associated W or Z bosons. Employing several improved techniques, these are currently the most sensitive searches in the world for these processes, surpassing previous CDF results by 30% beyond what would be expected from the addition of new data alone. Combining the search sensitivity of these production modes, 95% upper confidence limits on the standard model cross section times branching fraction are derived, yielding an observed (expected) upper limit of 4.3 (1.8) times the standard model prediction for a 125 GeV Higgs boson. The significance of the data relative to the background-only hypothesis is 2.7 sigma, currently the highest of any Higgs search in a single decay mode.
        Speaker: Dr Wei-Ming Yao (Lawrence Berkeley National Laboratory (US))
        Slides
      • 15:00
        Search for the Higgs boson in the diphoton decay channel with the ATLAS detector 15m
        A search for the Standard Model Higgs boson in the diphoton decay channel in proton-proton collisions using recent data collected with the ATLAS detector at the LHC, over the diphoton mass range 110-150 GeV is reported. Upper limits on the cross-section times branching ratio are derived. Additionaly, the results of the search for the fermiophobic Higgs boson are presented, based on the 4.9 fb-1 of data collected in 2011 at a centre-of-mass energy of 7 TeV.
        Speaker: Ms Kerstin Tackmann (Deutsches Elektronen-Synchrotron (DE))
        Slides
      • 15:15
        Search for SM Higgs decaying to two photons at CMS 15m
        Results are presented on the search for the standard model Higgs bosons decaying into two photons, and into a photon and a Z boson. Multivariate techniques are used to enhance the sensitivity. The full data sample of 4.7 fb-1 of pp collisions collected in 2011 at a CM energy of 7 TeV with the CMS experiment have been analyzed, as well as a significant fraction of the 2012 luminosity delivered so far at the new CM energy of 8 TeV.
        Speaker: Dr Serguei Ganjour (CEA - Centre d'Etudes de Saclay (FR))
        Slides
      • 15:30
        Refreshment Break 30m
      • 16:00
        Combination of CDF's Higgs boson Searches with up to 10 fb-1 of data 15m
        A combination of the results of searches for the standard model Higgs boson is presented. The searches use up to 10 fb-1 of Tevatron collider Run II data. We present upper bounds at the 95% CL on the production rate of a SM-like Higgs boson in the mass range 90-200 GeV. We further present measurements of the cross section times branching ratio for Higgs bosons decaying to bbbar, tau pairs, W pairs, and photon pairs. We evaluate the significance of observed excesses over the standard model background predictions.
        Speaker: Dr Azeddine Kasmi (Baylor University (US))
        Slides
      • 16:15
        Combined Search for the Standard Model Higgs Boson at D0 in ppbar Collisions at sqrt(s)=1.96 TeV 15m
        We present the combination of the searches for the Standard Model Higgs boson at a center-of-mass energy of sqrt(s)=1.96 TeV, using the full Run 2 dataset collected with the D0 detector at the Fermilab Tevatron collider. The major contributing processes include associated production (WH-->lvbb, ZH-->vvbb, ZH-->llbb, and WH-->WWW(*)) and gluon fusion (gg--> H-->WW(*)). The significant improvements across the full mass range resulting from the larger data sets, improved analyses and inclusion of additional channels are discussed. The combination of all channels results in significantly improved sensitivity across the 100-200 GeV mass range.
        Speaker: Dr Kenneth Richard Herner (University of Michigan (US))
        Slides
      • 16:30
        Determination of properties of a Higgs-like resonance at LHC 15m
        With the luminosity expected from the 2012 LHC run, the CMS and ATLAS experiments may reach the discovery sensitivity for the Higgs search in the low-mass region. If a new resonance is observed on LHC, it will be crucial to determine the spin and quantum numbers of the new particle and its couplings to Standard Model fields as accurately as possible. We study the production of a single resonance at the LHC and its decay into a pair of vector bosons. The simulation of the production and decay chain includes all spin correlations and the most general couplings of a spin-zero, -one, and -two resonance to Standard Model matter and gauge fields. Angular analysis is illustrated with an example of a resonance with mass around 125 GeV and expectations are given for various LHC luminosity scenarios.
        Speaker: Dr Sara Bolognesi (Johns Hopkins University (US))
        Slides
      • 16:45
        Prospects for Precision Higgs Physics at Linear Colliders 15m
        A linear e+e- collider provides excellent possibilities for precision measurements of the properties of the Higgs boson. At energies close to the Z-Higgs threshold, the Higgs boson can be studied in recoil against a Z boson, to obtain not only a precision mass measurement but also direct measurements of the branching ratios for all important decay modes, including possible decay to invisible species. At higher energies, the Higgs boson coupling to top quarks and the Higgs boson self-coupling can also be measured. At energies approaching 1 TeV and above, the rising cross section for Higgs production in WW fusion allows the measurement of very small branching ratios, including the branching ratio to muon pairs. These experiments make it possible to determine the complete profile of the Higgs boson in a model-independent way. This contribution will report the prospects for these measurements, based on the results of detailed full simulation studies performed within the frameworks of the CLIC conceptual design report and the ILC technical design report.
        Speaker: Dr Frank Simon (Max-Planck-Institut für Physik (DE))
        Slides
      • 17:00
        Prospects for Higgs Physics at a Large Hadron Electron Collider (LHeC Study Group) 15m
        The Large Hadron electron Collider (LHeC) is a proposed facility which will collide an LHC proton beam with a new 60 GeV electron beam. This contribution summarises the LHeC prospects for Higgs physics, as documented in the recently released Conceptual Design Report. Assuming a light Higgs boson, the dominant b-bbar coupling can be measured and other Standard model properties of the decay can be tested. The dominant Standard Model production mechanism via WW fusion yields a clean final state signature with missing transverse momentum and one high transverse momentum jet in addition to the Higgs decay products and also contains two rapidity gaps. Isolating this channel will allow sensitive tests of the CP structure and other properties of the HWW vertex, which lies at the heart of electroweak symmetry breaking.
        Speaker: Dr Uta Klein (University of Liverpool (UK))
        Slides
    • 09:00 18:00
      Room 216 - Particle Astrophysics and Cosmology -TR11 Room 216

      Room 216

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        Pangenesis: visible and dark matter from a common origin 15m
        The similarity of the visible and the dark matter relic abundances suggests related production mechanisms. This is possible if the dark matter density is -analogously to the visible matter- due to an asymmetry in a dark particle number which is conserved at low energies. In pangenesis, the visible and dark asymmetries are produced jointly via Affleck-Dine dynamics, and they compensate each other under an always conserved generalised baryon number. Supersymmetry, GeV-scale dark-matter mass (favoured by current direct detection experiments) and a Z' boson with a significant invisible width into the dark sector would constitute evidence for this mechanism.
        Speaker: Dr Kalliopi Petraki (University of Melbourne (AU))
        Slides
      • 09:15
        The Affleck-Dine dynamics of pangenesis 15m
        In pangenesis, the baryon asymmetry of the universe and the dark matter abundance are generated simultaneously via the Affleck-Dine mechanism. This talk will discuss the Affleck-Dine dynamics, both for the case of gravity- and gauge-mediated supersymmetry breaking. Cosmological constraints on the scenario, in particular arising from the production of gravitinos and the formation of Q-balls, will be considered and the viable regions of parameter space for successful pangenesis presented. The results are also applicable to other scenarios involving the Affleck-Dine mechanism.
        Speaker: Dr Benedict von Harling (University of Melbourne (AU))
        Slides
      • 09:30
        Dynamical Dark Matter: A Theoretical Overview 15m
        In this talk, we introduce a new framework for dark-matter physics which we call "Dynamical Dark Matter". Rather than focus on one or more stable dark-matter particles, we instead consider a multi-component framework in which the dark matter of the universe comprises a vast ensemble of interacting fields with a variety of different masses, mixings, and abundances. Moreover, rather than impose stability for each field individually, we ensure the phenomenological viability of such a scenario by requiring that those states with larger masses and Standard-Model decay widths have correspondingly smaller relic abundances, and vice versa. In other words, dark-matter stability is not an absolute requirement in such a framework, but is balanced against abundance. This leads to a highly dynamical scenario in which cosmological quantities such as Omega_{CDM} experience non-trivial time-dependences beyond those associated with the expansion of the universe. Although it may seem difficult to arrange an ensemble of states which have the required decay widths and relic abundances, we present one particular example in which this balancing act occurs naturally: an infinite tower of Kaluza-Klein (KK) states living in the bulk of large extra spacetime dimensions. Remarkably, this remains true even if the stability of the KK tower itself is entirely unprotected. Thus theories with large extra dimensions --- and by extension, certain limits of string theory --- naturally give rise to dynamical dark matter. Such scenarios also generically give rise to a rich set of collider and astrophysical phenomena which transcend those usually associated with dark matter.
        Speaker: Prof. Keith Dienes (NSF & University of Arizona & University of Maryland (US))
        Slides
      • 09:45
        Dynamical Dark Matter: An Explicit Model 15m
        In this talk, we provide an explicit realization of the DDM framework in which the constituent fields of the dark-matter ensemble are the mixed KK excitations of an axion propagating in the bulk of large extra spacetime dimensions. Mixing between these KK excitations, induced by a brane mass term, leads to a suppression of the interactions between the light mass eigenstates in the KK tower and the Standard-Model fields on the brane. Largely as a result of this suppression, the DDM ensemble in this model satisfies all collider, astrophysical, and cosmological constraints while at the same time providing the observed dark-matter relic abundance. This model therefore serves as an existence proof that the DDM framework is a viable alternative to traditional models of dark matter.
        Speaker: Dr Brooks Thomas (University of Hawaii (US))
        Slides
      • 10:00
        Dark matter search results from the COUPP 4 kg bubble chamber 15m
        Data will be reported from the operation of a 4.0 kg CF3I bubble chamber in the 6800 foot deep SNOLAB underground laboratory. The effectiveness of ultrasound analysis in discriminating alpha decay background events from single nuclear recoils has been confirmed. The total exposure was 553 kg-days distributed over three different bubble nucleation thresholds. This observation provides world best direct detection constraints on WIMP-proton spin-dependent scattering for WIMP masses >20 GeV/c^2 and demonstrates significant sensitivity for spin-independent interactions. Updates on progress towards operation of larger scale bubble chambers will also be presented.
        Speaker: Dr Russell Neilson (University of Chicago (US))
        Slides
      • 10:15
        Low-Mass Dark Matter Searches with Sub-keV Germanium Detectors 15m
        Germanium detectors with sub-keV sensitivities offer a unique opportunity to probe low-mass WIMP Dark Matter, where there is an intense interest inspired by possible allowed regions indicated by the CoGeNT experiment. The TEXONO-CDEX Collaboration has been pursuing such research program at the Kuo-Sheng Neutrino Laboratory (KSNL) in Taiwan and in the China Jinping Underground Laboratory (CJPL) in China. In this presentation, we will focus on commissioning of the 1-kg-class experiments at CJPL, as well as the latest status, results and plans of the analysis.
        Speaker: Dr Hau-Bin Li (Academia Sinica (TW))
        Slides
      • 10:30
        Status and Prospects for SuperCDMS 20m
        Direct searches for dark matter are one of the most promising ways to discover new particles and fields. For over a decade, the Cryogenic Dark Matter Search has been a leader in searches for dark matter. CDMS has pioneered the use of athermal phonon and ionization sensors to achieve world-leading sensitivity to a theoretically-favored dark matter candidate, the Weakly Interacting Massive Particle. This endeavor is far from complete, however. The next generation of the experiment, SuperCDMS, will take place in two phases. The first phase of the experiment, SuperCDMS Soudan, is now in operation in Northern Minnesota. The dark matter detector consists of a 9-kg array of Ge crystals. The second phase, SuperCDMS SNOLAB, is under active development. This phase will consist of ~200 kg of Ge crystals and will be deployed in SNOLAB, the deepest underground laboratory in the Western Hemisphere. This is a busy and exciting time as we work to turn these plans into reality. I will describe the SuperCDMS projects and report on their present status.
        Speaker: Dr Lauren Hsu (Fermi National Accelerator Laboratory (US))
        Slides
      • 10:50
        Refreshment Break 10m
      • 11:00
        Mirror dark matter interpretations of DAMA, CoGeNT and CRESST-II experiments 15m
        The DAMA, CoGeNT and CRESST-II experiments have announced evidence for the direct detection of dark matter. We discuss these results in the context of the mirror dark matter framework. We show that all three experiments can be simultaneously explained via kinetic mixing induced elastic scattering of a mirror metal component off target nuclei. This metal component can be as heavy as Fe$'$ if the galactic rotational velocity is relatively low: $v_{rot} < 220$ km/s. This explanation is consistent with the constraints from the other experiments, such as CDMS/Ge, CDMS/Si and XENON100 when modest $\sim 20-30\%$ uncertainties in energy scale are considered.
        Speaker: Dr Robert Foot (University of Melbourne (AU))
        Slides
      • 11:15
        Universal behavior in the scattering of heavy, weakly interacting dark matter on nuclear targets 15m
        We introduce heavy particle effective field theory techniques to isolate universal properties and to systematically study the QCD anatomy of dark matter direct detection. In particular: Particles that are heavy compared to the electroweak scale ($M \gg m_W$), and that are charged under electroweak SU(2) gauge interactions display universal properties such as a characteristic fine structure in the mass spectrum induced by electroweak symmetry breaking, and an approximately universal cross section for scattering on nuclear targets. The heavy particle effective theory framework is developed to compute these properties. As illustration, the spin independent cross section for low-velocity scattering on a nucleon is evaluated in the limit $M \gg m_W$, including complete leading-order matching onto quark and gluon operators, renormalization analysis, and systematic treatment of perturbative and hadronic-input uncertainties.
        Speaker: Prof. Richard Hill (University of Chicago (US))
        Slides
      • 11:30
        Light neutralino dark matter in MSSM 15m
        Three dark matter direct detection experiments (DAMA, COGENT and CRESST) have reported a possible signal of WIMP interaction corresponding to very light particles, close to the edge of the XENON-100 and CDMS sensitivity. Imposing the latest constraints from colliders, flavour physics, electroweak precision tests and dark matter searches, we show that viable MSSM scenarios with a light neutralino, in agreement with all the present data, are feasible. An analysis of the characteristics of the resulting scenarios will be presented.
        Speaker: Dr Nazila Mahmoudi (CERN (CH) & Clermont Ferrand University (FR))
        Slides
      • 11:45
        Dark Matter Relic and Its Implications on the Underground Laboratory and LHC Search 15m
        Dark matter (DM) search is one of the major goals in the modern physics. An eligible dark matter candidate may reproduce the correct relic inferred from astrophysical observations, e.g. WMAP experiment. It may also be compatible with the null results on dark matter direct detection performed in the underground laboratories by measuring events of nuclei recoil as scattered by the halo dark matter, e.g. XENON experiment. Due to weakly interacting, dark matter particles produced at colliders involve missing momentum and this increase the mono-jet plus missing $E_T$ events. But so far there is no deviation from SM prediction found with the now accumulated luminosity, e.g. LHC experiment. Alternative to the recent effective operator study shows it is hard to compatible with relic and collider search simultaneously. Here we study a dark sector consists of DM fermion and scalar mediator with a mediator kinematics details kept. We display viable parameter space in terms of these two exotic particle masses which satisfy various experimental data.
        Speaker: Dr Ho-Chin Tsai (Chung Yuan Christian University (TW))
        Slides
      • 12:00
        Detecting Dark Matter at the LHC with Electroweak Bremsstrahlung 15m
        We investigate electroweak bremsstrahlung as a potential search channel for dark matter at the LHC. For illustrative purposes we consider a typical quarkphilic model with a Majorana dark matter candidate. We focus on the emission of a $Z$ boson from either the initial state particles or the internal propagator during annihilation of quarks into dark matter. Among the signatures of such processes will be a pair of high $p_T$ muons that reconstruct to the invariant mass of the $m_Z$, and large amounts of missing energy. We compare this signal to Standard Model backgrounds at the generator level, as a proof of principle for this search channel. We find that in certain regions of the model parameter space, up to 50% signal to background can be achieved, for 14TeV centre of momentum energy.
        Speaker: Mr Galea Ahmad (University of Melbourne (AU))
        Slides
      • 12:15
        Signatures of Dark Matter Annihilation in the Cosmic Microwave Background 15m
        The annihilation or decay of dark matter (DM), or other new physics, could inject high-energy electrons and photons into the universe during the cosmic dark ages. The resulting modification to the cosmic ionization history induces a characteristic perturbation to the anisotropies of the cosmic microwave background (CMB) radiation. I will show how to describe an arbitrary energy injection history in terms of a few parameters that efficiently characterize the possible effects on the CMB, and how to apply the resulting constraints to assorted DM models.
        Speaker: Dr Tracy Slatyer (Institute for Advanced Study (US))
        Slides
      • 12:30
        The status of the cosmic e+/e- anomaly 15m
        The anomalous part of the cosmic electron-positron flux can be isolated within a Bayesian likelihood analysis. From the cosmic ray data the values of relevant cosmic ray propagation parameters can be also be inferred. I show how a tension arises between various cosmic ray datasets indicating an e+/e- anomaly. Then I show how to calculate the anomalous part of the PAMELA and Fermi-LAT measurements. I focus on the uncertainty of this 'signal'. Finally, I briefly compare this signal to some theoretical results predicting such an anomaly.
        Speaker: Prof. Csaba Balazs (Monash University (AU))
        Slides
      • 12:45
        Dark Matter Searches with the Fermi Large Area Telescope 20m
        Can we learn about New Physics with astronomical and astro-particle data? Since its launch in the 2008, the Large Area Telescope, onboard of the Fermi Gamma-ray Space Telescope, has detected the largest amount of gamma rays in the 20MeV 300GeV energy range and electrons + positrons in the 7 GeV- 1 TeV range. This impressive statistics allows one to perform a very sensitive indirect experimental search for dark matter. I will present the latest results on these searches and the comparison with LHC searches.
        Speaker: Aldo Morselli (INFN Roma Tor Vergata)
        Slides
      • 13:05
        Lunch Break 40m
      • 13:45
        A metric theory of gravity with torsion in extra-dimension 15m
        Present a theory of gravity with an extra-dimension and metric-dependent torsion. A set of constraints imposed on the geometry confine torsion components to the extra-dimension and determine all the connection coefficients in terms of the metric. At the kinematic level, the theory maps on to 4D General Relativity. keeping the extra-dimension hidden. But the dynamical field equations that follow from the action principle deviate markedly for the standard Einstein equations.
        Speaker: Prof. Kameshwar Wali (Syracuse University (US))
        Slides
      • 14:00
        Measurements of High Energy Particle Interaction Properties with the Pierre Auger Cosmic Ray Observatory 15m
        The Pierre Auger Observatory is a cosmic ray detector optimized for the detection of air showers (particle cascades in the atmosphere) created by particles with energies ranging from 10^17 eV to about 10^20 eV. The Pierre Auger Observatory is a hybrid detector. It uses a ground array of water Cherenkov tanks (deployed over an area of 3000 square kilometers), and a set of fluorescence telescopes overlooking the atmosphere above the ground array. The ground array measures the density of particles at ground level, while the fluorescence telescopes measure the shower development profile through the atmosphere. In this presentation, I will focus on our recent measurements of the proton-air cross section at sqrt(s) = 57 TeV, and on our measurements of the muon content in air showers, which appears to be approximately a factor of two larger than predicted by models.
        Speaker: Dr Jose Bellido (University of Adelaide (AU))
        Slides
      • 14:15
        Ultra-High Energy Neutrinos at the Pierre Auger Observatory 15m
        The observation of ultra-high energy netrinos (UHEυs) is a priority in experimental astroparticle physics. This follows from the expectation that energetic cosmic ray particles are likely to be produced with an associated flux of neutrinos, and the belief that UHE cosmic ray interactions will produce neutrinos as the parent particles travel to us through various astrophysical radiation fields. UHEυs can be detected with a variety of techniques, and the Surface Detector array of the Pierre Auger Observatory is suited to detecting cascades produced when such neutrinos interact in the atmosphere (downward-going υ) or in the Earth's crust (Earth-skimming υ). This presentation will review the signatures of neutrino events and the procedure and criteria established to search for UHEυs in the Pierre Auger Observatory dataset.
        Speaker: Prof. Roger Clay (University of Adelaide (AU))
        Slides
      • 14:30
        Results from the Telescope Array Experiment 15m
        The Telescope Array (TA) experiment is the largest experiment in the northern hemisphere studying ultra high energy cosmic rays (UHECRs). The Telescope Array is a hybrid detector consists of a surface detector (SD) array and air fluorescence detectors (FDs). This hybrid detector is observing extensive air showers to measure the energy spectrum, anisotropy and composition of ultra high energy cosmic ray (above 10^19eV). In this talk, we will report on recent results from TA: the energy spectrum measured by SD array, cosmic ray composition measured with the FDs, and a search for correlations between the pointing directions of cosmic rays, measured by SD array, and possible source distributions.
        Speaker: Dr Hisao Tokuno (Tokyo Institute of Technology (JP))
        Slides
      • 14:45
        Selected results from the ARGO-YBJ experiment 15m
        The ARGO-YBJ experiment is an unconventional air-shower array designed for studying astronomical gamma-ray sources at energy greater than few hundred GeV and cosmic-ray physics at energy greater than about 1 TeV. The detector fulfils the requirements to achieve such goals thanks to its high-altitude location, 4300 meters a.s.l. on the Tibet plateau, and to its structure: a full-coverage layer of Resistive Plate Chambers (RPCs) covering a surface of 78 x 74 m^2, surrounded by a guard ring of RPCs enclosing a total surface of about 11000 m^2. ARGO-YBJ has been running with the complete layout since November 2007, collecting about 4 x 10^11 events. The main results obtained by ARGO-YBJ, namely the cosmic-ray anisotropy, the monitoring of gamma-ray sources and the limit on the antiproton-proton ratio in the primary cosmic radiation, will be discussed.
        Speaker: Dr Paolo Camarri (University of Roma Tor Vergata)
        Slides
      • 15:00
        The LHCf experiment to verify UHECR interactions at LHC 15m
        The LHCf experiment has performed dedicated measurement of neutral particles in the very forward of LHC p-p collisions. The results in inclusive single photon spectra at 7TeV and 900GeV p-p collisions, and the pi0 transverse spectra at 7TeV p-p are presented with comparison of various hadron interaction models used for UHECR shower simulations. Also prospects in the 2012 p-Pb runs at LHC and possible future A-A runs are discussed.
        Speaker: Prof. Yoshitaka Ito (Nagoya University (JP))
        Slides
      • 15:15
        Longitudinal Shower Development Studies Near 8 TeV. 15m
        (KASCADE-Grande Collaboration). Muons have never been used up to now to reconstruct the hadron longitudinal development of Extensive-Air-Showers (EAS) induced by Cosmic Rays (CR) with sufficient accuracy, due to the difficulty of building large area ground-based muon telescopes. The Muon Tracking Detector (MTD) in the KASCADE-Grande experiment (128 m², Eµ>0.8 GeV) allows to study the angular correlation between muon tracks and the shower axis with high precision and for 'protons' in a CM-energy range from 1.4-8.0 TeV or higher. The muon production height allows an almost model independent investigation of the mass composition of the CR flux. Extensive CR composition studies in KASCADE-Grande based on extensive MC simulations (CORSIKA+Interaction Models) are available for comparison. A deficit of muons in the data for only the highest CM-energy in the region of the first interactions above 15 km, compared to MC-simulations for proton primaries (CORSIKA, QGSjet-II + FLUKA 2002.4), is observed. Muon pseudorapidity distributions at all energies are compared to MC simulations. An experimental pseudorapidity gap for muons may support a heavy mass production at 8 TeV. The deviation from 'standard' high energy MC is strongest for the 'light' CR primaries at 8 TeV. 'Heavy' primaries show little deviation from the MC prediction, which points to a possible threshold effect for the 'light' CR primaries. In EAS studies we deal with the pions in the fragmentation region which deliver muons conserving the rapidity of the parent mesons. With respect to the effect of missing muons at the highest energy, the comparison with other type of high energy interaction models is of interest.
        Speaker: Dr Paul Doll (KIT (DE))
        Slides
      • 15:30
        Gamma Ray Source Studies Using Muon Tracking. 15m
        (KASCADE-Grande Collaboration). High energy gamma rays produce muons in the Earth's atmosphere that can be detected and reconstructed in relatively shallow underground muon detectors such as ICECUBE and MILAGRO. Although muons of such low energy are mostly produced by charged Cosmic Ray (CR) particles, gamma produced muons (via photo-pion production) can be identified provided the detector has sufficient effective area and resolution. A large area (128m², Eµ>0.8 GeV) streamer tube detector, located within the KASCADE-Grande detector field has been used for muon tracking studies. We discuss the possibility of observing gamma-ray sources by means of photo-pion produced single isolated muon tracks above the background of CR muons using a Muon Tracking Detector (MTD). Properties of the photo-production process in the atmosphere and of the MTD which support the identification of gammas are discussed. The sensitivity of the technique of observing the Crab energy spectrum in the tens of GeV range is discussed. Gamma spectra accumulated from Crab and a flux correlation for Mrk 421 of photo-produced muons with the X-ray flux (RXTE/PCA) are presented. High resolution muon tracking may provide an alternative technique for a wide field of view and large duty cycle observations of gamma sources.
        Speaker: Dr Paul Doll (KIT (DE))
        Slides
      • 15:45
        Refreshment Break 15m
      • 16:00
        Generalized Galileons for Particle Physics and Cosmology 15m
        I describe how to construct new scalar field theories in four dimensions with attractive properties such as nonrenormalization theorems and interesting nonlinear classical dynamics. These generalized galileons are related to extra dimensional gravity models, and have a tight relationship to massive gravity models. Their properties suggest applications in inflation, late-time cosmic acceleration, and perhaps in tackling the hierarchy problem.
        Speaker: Prof. Mark Trodden (University of Pennsylvania (US))
        Slides
      • 16:15
        Matter Inflation 15m
        We discuss inflation models in supergravity, where the inflaton resides in the matter sector of the theory. These models, referred to as matter inflation, are based on a tribrid structure in the superpotential and allow for a Heisenberg symmetry or a shift symmetry for solving the eta-problem. Possible close connections to particle physics theories are discussed, such as sneutrino hybrid inflation, or models where a D-flat direction of GUT multiplets acts as the inflaton in SO(10) Grand Unified Theories. Although inflation ends by a waterfall, associated with the breaking of a GUT or family symmetry, the production of topological defects can be avoided by vacuum preselection.
        Speaker: Prof. Stefan Antusch (University of Basel (CH))
        Slides
      • 16:30
        STUDY OF THE 2H(α,γ)6Li REACTION PRODUCING 6Li IN STANDARD BIG BANG NUCLEOSYNTHESIS 15m
        LUNA (Laboratory for Underground Nuclear Astrophysics) is devoted to measure nuclear cross sections relevant in astroparticle physics. The LUNA measurements are performed at the "Laboratori Nazionali del Gran Sasso" (LNGS), with the unique accelerator in the world operating underground. Here, the background induced by cosmic rays is orders of magnitude lower than outside. As a consequence, with the LUNA facility it is possible to make direct measurements at energies well below the coulomb barrier, thus giving a solid experimental footing on several field of astrophysics and particle physics, such as the solar neutrino flux, the stellar evolution and the primordial abundance of isotopes after BBN. The presentation is centered on the measurement of the 2H(α,γ)6Li reaction, that is the leading process to produce the primordial 6Li. Recent observations of a high abundance of 6Li in metal-poor stars (Asplund et al. 2006) are debated. However, because of the very low cross section, direct measurements exists only for energies greater than 700 keV, making the 6Li abundance calculation affected by a large uncertainty. For the first time, a direct measurement has been performed at energies around Ecm=100 keV, i.e. well inside the BBN region of interest (40 keV < Ecm < 300 keV). The innovative experimental tecnique and the preliminary results will be shown.
        Speaker: Dr Carlo Gustavino (INFN (IT))
        Slides
      • 16:45
        CMB Polarization Results from the QUIET Experiment 15m
        QUIET is a ground-based CMB Polarization experiment, which aims to detect the degree-scale B-modes (curl components) induced by primordial gravitational waves. The existence of the primordial gravitational wave is a generic prediction of inflationary universe, therefore the detection of the B-modes is a "smoking-gun" signature of the inflation. The B-mode signal is expected to be orders of magnitude smaller than the temperature anisotropy so having a large detector array with precise control and mitigation of systematic effects is essential. QUIET employs the world largest coherent receiver arrays in 43 GHz and 95 GHz frequency bands, and had accumulated CMB data for over 10000 hours at 5,000m altitude in Chile: the Chajnantor plateau. Our unique instruments design and the calibration strategy lead to the lowest levels of systematic errors to date. Those advantages enable us to begin to prove the B-modes. In this talk, I will describe the QUIET experiment and the results for the CMB polarization measurements.
        Speaker: Dr Masaya Hasegawa (KEK (JP))
        Slides
      • 17:00
        Cosmology and particle physics with POLARBEAR 15m
        Cosmic inflation predicts that primordial gravitational waves were created during the inflationary era. Measurements of polarization of the Cosmic Microwave Background (CMB) radiation are known as the best probe to detect the primordial gravitational waves. POLARBEAR is a telescope designed to detect the CMB B-mode with very sensitive polarimeters based on superconductive transition edge sensor (TES) detector technology. Its large primary mirror with a diameter of 3.5m also allows us to constrain or measure the sum of neutrino masses beyond the limit obtained so far. POLARBEAR is located on the Chajnantor plateau in the Atacama desert in northern Chile at an altitude of 5,200m. We received the first light in January 2012 and are taking CMB data at 150 GHz. In this presentation we will describe the current status and prospect of POLARBEAR.
        Speaker: Dr Masaya Hasegawa (KEK (JP))
        Slides
      • 17:15
        The Fermi Large Area Telescope at 4: the Surprising Gamma-Ray Sky. 15m
        The Fermi Large Area Telescope (LAT) has been operating since June 2008 and observes the gamma-ray sky from 20 MeV to over 300 GeV. The first four years of the LAT era have seen numerous exciting scientific results, some expected and others unexpected. In this talk I will discuss the current state of our understanding of the gamma-ray sky. In particular, I will describe how the Fermi-LAT has improved our accounting of the contributions from known astrophysical source classes, including some previously undiscovered, and how we can disentangle such contributions from signatures of particle dark matter interactions and other possible signatures for new physics
        Speaker: Dr Eric Charles (SLAC (US))
        Slides
      • 17:30
        Status of the AMS-02 detector after one year of operation on the International Space Station 20m
        The Alpha Magnetic Spectrometer AMS-02 has been installed in May 19th 2011 on the International Space Station where it will detect cosmic rays for the next decades. AMS-02 with its accurate measurements up to the TeV scale will contribute to our knowledge of the Universe providing the most sensitive search for the existence of primordial anti matter and indirect search for dark matter. Nine layers of silicon micro-strip constitute the core of the spectrometer, allowing the simultaneous measurement of the sign and charge of impinging particles and reconstructing their rigidity up to the TV. The 3D imaging calorimeter, with a depth of 17 radiation lengths, and the TRD detector provide an accurate measurement of the electron and positron components, rejecting the protons background. Velocity and charge measurements are performed by the scintillator planes of the Time of Flight system and by the Ring Imaging Cherenkov detector. During the first year in Space several billion events have been recorded: the AMS-02 flight operations, performance and perspective for physics measurements will be reported.
        Speaker: Prof. Veronica Bindi (University of Hawaii at Manoa (US))
        Slides
    • 09:00 18:00
      Room 217 - Education & Outreach - QCD, Jet, Parton Distributions - TR15&6 Room 217

      Room 217

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        The importance of Science Communication Now 30m
        Speaker: Rolf Heuer (CERN)
      • 09:30
        Opportunities to Learn Scientific Literacy 20m
        Support for "big science" must come from a society that is scientifically literate. We get few chances to develop scientific literacy for students who do not study science formally in university or college. QuarkNet provides activities in which high school students work with particle physics data and do scientific investigations. Evaluation data show that participants broaden their frame of reference for science, learning how scientists discover new knowledge and talk about their work. We will provide brief descriptions of three activities—masterclasses, e-Labs and student research teams, methods and results of the evaluation and some effective practices based our work.
        Speaker: Ms Marjorie Bardeen (Fermilab Friends for Science Education (US))
        Slides
      • 09:50
        European and global networks for high-energy physics communications and outreach 20m
        As High-Energy physics is going global, high-energy physicists and their organizations collaborate more and more not only into science but also in communicating about it. Communications play an increasing role in our society, and we face big challenges as the visibility of our field is becoming high. Networks for outreach and communications are then crucial to promote the field in a coherent way at the global level, to coordinate activities and develop common actions. We will present networks that developed mainly around CERN such as EPPCN, Interactions, IPPOG... with a focus on two key questions: How can physicists benefit from these networks? What can they do to to help these networks?
        Speaker: Mr Arnaud Marsollier (CERN)
        Slides
      • 10:10
        International Particle Physics Masterclasses - Bringing LHC data into the classroom 20m
        The International Particle Physics Outreach Group (IPPOG) has developed an educational activity that brings the excitement of cutting-edge particle physics research into the classroom. Each year, since 2005, thousands of high school students in many countries all over the world come to nearby universities or research centres for one day in order to unravel the mysteries of particle physics and be “scientists for a day”. In 2012, 10000 students from 130 institutions in 31 countries took part in the popular event over 4 weeks. Lectures from active scientists give insight on topics and methods of fundamental research on the building blocks of matter and the forces between them, enabling the students to perform measurements on real data from particle physics experiments themselves. The last two years featured the use of fresh LHC data from the ALICE, ATLAS and CMS experiments. Event display programs, software tools and analysis methods are quickly mastered by students who then measure various properties of some known particles, such as the weak gauge bosons W and Z and a number of hadrons (Jpsi, Upsilon, Lambda, K-short). The fractions of W+ and W- events are interpreted in terms of quark structure of the proton (not just the simple view of uud quarks). The concept of invariant mass is first used to identify and measure masses and widths of short-lived particles, before it is applied to look for new particles. At the end of each day, with tools used in our international research collaborations, the participants join in a videoconference with CERN or Fermilab for discussion and combination of their results. The latter are then compared to recent results published by the experiments. We will describe the methodology employed for the IPPOG International Masterclasses, summarise the measurements performed and report on the impact of the day on young students. We will show how you (the particle physicist) can become involved in this activity and develop your own initiatives based around the samples of LHC data and associated tools.
        Speaker: Prof. Farid Ould-Saada (Oslo University (NO))
        Slides
      • 10:30
        Refreshment Break 30m
      • 11:00
        Social Media in Science Communication 30m
        We demonstrate social media in action along with a panel discussion on how you could benefit from using these platforms to better engage with your audiences. Social media are increasingly used as tools for science communication by science journalists and writers, by scientific organisations and laboratories, as well as by scientists themselves. These media offer many advantages over traditional methods of communicating, which are usually unidirectional. Social networks encourage dialogue and allow the general public as well as members of the press to have an open and personal conversation with scientists at the forefront of human knowledge.
        Speaker: Mrs Claudia Marcelloni De Oliveira (Lawrence Berkeley National Lab. (US))
      • 11:30
        Great Moments in Science 30m
        Speaker: Dr Karl Kruszelnicki (University of Sydney (AU))
      • 12:00
        Q&A to the Public 1h
      • 13:00
        Lunch Break 1h
      • 14:00
        Heavy-quarkonium theory in the LHC era 15m
        We review the present landscape of heavy-quarkonium theory, its tests by worldwide collider and fixed-target experiments, and the future perspectives offered by the LHC. Special emphasis is placed on the effective quantum field theory of nonrelativistic QCD (NRQCD), endowed with the factorization theorem conjectured by Bodwin, Braaten, and Lepage, which arguably constitutes the most probable candidate theory at the present time. Being impressively consolidated at the next-to-leading order (NLO) by the world's data on unpolarized J/psi production, NRQCD factorization has now reached the crossroads. In fact, NLO NRQCD exhibits encouraging agreement with the first J/psi polarization measurement at the LHC, performed by ALICE at 7 TeV (cf. the cover story of the current issue of CERN Courier), while it severely disagrees, by 10-20 experimental standard deviations, with a similar measurement by CDF at Tevatron's Run II, with 1.96 TeV. In this tantalizing situation, we eagerly await final clarification by the wealth of LHC data to come.
        Speaker: Prof. Bernd Kniehl (University of Hamburg (DE))
        Slides
      • 14:15
        J/psi production in NLO NRQCD: A global analysis of yield and polarization 15m
        We present a rigorous next-to-leading order analysis of J/psi yield and polarization within the factorization theorem of nonrelativistic QCD (NRQCD). To the orders considered, this framework depends on the values of three color-octet long-distance matrix elements (LDMEs), which are predicted to be process-independent. We extract their values in a global fit to inclusive J/psi production yield data from various hadroproduction, photoproduction, two-photon scattering and electron-positron annihilation experiments. We show that this fit is constrained and stable and describes all data sufficiently well. We then use these values to predict the J/psi polarization in photo- and hadroproduction and compare to the currently available data. As for photoproduction, HERA data is not precise enough to draw definite conclusions. But as for hadroproduction, CDF data measured at Tevatron run II is in strong conflict with NRQCD predictions, a feature familiar from the previous Born analyses. With early ALICE data being however compatible with NRQCD, the future, more precise polarization measurements at the LHC will thus have the potential to clearly confirm or dismiss the universality of the LDMEs.
        Speaker: Dr Mathias Butenschoen (University of Hamburg (DE))
        Slides
      • 14:30
        Onia production and polarisation at LHCb 15m
        Studies of quarkonia production in the forward region provide important tests of perturbative QCD. We present studies of the production of charmonia and bottomonia in the LHCb detector, using data from proton-proton collisions at a range of centre-of-mass energies. The results are compared to recent theoretical predictions. Absolute and relative production cross-sections are presented for both S-wave and P-wave onia states. We also present studies of onia polarisation and double charm production, the latter performed for the first time at a hadron collider.
        Speaker: Prof. Valerie Gibson (University of Cambridge (GB))
        Slides
      • 14:45
        Measurements of Y(nS) polarization with the CMS experiment 15m
        The polarizations of the Upsilon(1S), Upsilon(2S) and Upsilon(3S) mesons produced in proton-proton collisions at = 7 TeV are measured using a data sample collected with the CMS detector at the LHC, corresponding to an integrated luminosity of around 5 fb^{-1}. The measurements are based on the analysis of the dimuon decay angular distributions, analyzed in three different polarization frames, and are presented as a function of the Upsilon transverse momentum, in two rapidity ranges. The measurement of the polarization parameters, lambda_theta, lambda_phi and lambda_{theta phi} is complemented by the determination of the frame-invariant quantity lambda_tilde, which provides a very useful intrinsic test of the reliability of the whole analysis chain and supplementary physical information.
        Speaker: Mr Valentin Knunz (Austrian Academy of Sciences (AT))
        Slides
      • 15:00
        Production of Quarkonia States at LHC with ATLAS experiment 15m
        The production of Quarkonia states at hadron colliders has been the subject of various theoretical approaches, which can now be compared to measurement performed at LHC. In the Charmonium family, the production of J/Psi has been studied over wide range of pT. In the Bottomonium family, the production of Y(1S) has been studied by ATLAS. The recent first observation of resonances decaying to Y(1S) gamma and Y(2S) gamma, and with mass about 30 MeV below the open-beauty threshold is presented. The signal is consistent with the multiplet of Chi_b(3P) states predicted by potential models. Comparable studies in the Charmonium sector and plans for future measurements are illustrated.
        Speaker: Dr James William WALDER (Lancaster University (UK))
        Slides
      • 15:15
        Quarkonium production in the LHC era: QCD corrections and new observables 15m
        I will discuss the impact of QCD corrections on the P_T differential cross section for quarkonium production at RHIC [1], Tevatron and LHC energies [2], as well as the contributions from charm-gluon fusion [3]. I will discuss the promising agreement between the parameter-free predictions of the Colour-Singlet Model --up to alpha_s^5 in some cases-- and the first LHC data for J/psi and Upsilon (see e.g. [4-7]), especially in the region of low transverse momenta and thus for the P_T integrated yields. I will also show predictions for the polarisation to be compared with the (forthcoming) LHC results [8]. Additionally, I will justify the introduction of new observables meant to better discriminate between the different mechanisms at work in quarkonium production at high energies. Finally, I will touch upon the issue of the extraction of gluon PDF using quarkonium yields [9] as it was done in pioneer works in the late eighties [10,11].
        Speaker: Dr Jean-Philippe Lansberg (Institut de Physique Nucléaire d'Orsay (FR))
        Slides
      • 15:30
        Refreshment Break 30m
      • 16:00
        Recent results from HERMES 15m
        The main focus of the HERMES experiment at DESY was the detailed investigation of the spin structure of the nucleon, mainly its decomposition into contributions from quarks and gluon spins and their orbital angular momenta. Many exciting, unexpected results have been obtained by measuring semi-inclusive and exclusive processes in deep-inelastic scattering. Over recent years, pioneering measurements of observables carrying information about the three-dimensional nucleon structure were performed. We will present an overview about recent results from HERMES, relate them with our current understanding of the spin and three-dimensional structure of the nucleon, and discuss their relevance for other physics fields.
        Speaker: Dr Delia Hasch (INFN-Frascati (IT))
        Slides
      • 16:15
        New insights into soft gluons and gravitons 15m
        The study of gluon radiation in QCD, in the limit of small ("soft") momentum, remains an active research area, with a variety of phenomenological and theoretical applications. Soft gluon emission leads to large logarithms in perturbation theory which have to be summed up to all orders in the coupling, and also governs the structure of infrared singularities. Recently, new techniques and mathematical structures have been discovered, which enhance our understanding of these all-order properties. This talk will review a number of key topics, including: (i) the structure of infrared divergences in multiparton scattering; (ii) constraints from the high energy limit; (iii) intriguing relations between the soft limits of QCD and quantum gravity.
        Speaker: Dr Chris White (University of Glasgow (UK))
        Slides
      • 16:30
        Exclusive VM production at HERA 15m
        The exclusive photoproduction reaction gamma p -> Upsilon(1S) p has been studied with the ZEUS detector in ep collisions at HERA.The exclusive electroproduction of two pions in the mass range 0.4 < M(pipi) < 2.5 GeV has also been studied with the ZEUS detector at HERA. The two-pion invariant-mass distribution is interpreted in terms of the pion electromagnetic form factor, |F(M(pipi)|, assuming that the studied mass range includes the contributions of the rho, rho' and rho'' vector-meson states.Results from exclusive diffractive photoproduction of J/psi mesons as measured with the H1 detector at the electron-proton collider HERA will be shown. Differential cross sections will be presented as a function of t, the squared four-momentum transfer at the proton vertex, and of W_gammap in the kinematical range of low photon virtualities of Q^2 < 2.5 GeV^2.
        Speaker: Prof. Sampa Bhadra (York University)
        Slides
      • 16:45
        Measurement of Collins asymmetries in inclusive production of pion pairs in e+e- collisions at BABAR 15m
        The transversity distribution function, which describes the quark transverse polarization inside a transversely polarized nucleon, is the least known leading-twist component of the QCD description of the partonic structure of the nucleon. Transversity can be extracted from semi-inclusive deep-inelastic-scattering data where, however, it couples to a new fragmentation function, called the Collins function. We present a measurement of the azimuthal asymmetries in the process e+e- --> q qbar --> pi pi X, where the two pions are produced in opposite hemispheres, based on data collected by the BABAR experiment at a center-of-mass energy of about 10 GeV. The Collins function is extracted from the measured asymmetries.
        Speaker: Dr Isabella Garzia (SLAC & INFN (IT))
        Slides
      • 17:00
        Hadron production in e+e- collisions at BABAR and implications for the muon anomalous magnetic moment 15m
        The BABAR Collaboration has an intensive program of studying hadronic cross sections at low-energy e+e- collisions, accessible at BaBar via initial-state radiation. Our measurements allow significant improvements in the precision of the predicted value of the muon anomalous magnetic moment. These improvements are necessary for shedding light on the current ~3.5 sigma difference between the predicted and the experimental values. We have published results on a number of processes with two to six hadrons in the final state. We report here the results of recent studies with the final states 2(pi+pi-), K+K-pi+pi-, K+K-pi0pi0, and 2(K+K-), which constitute the main contribution to the hadronic cross section in the energy region between 1 and 3 GeV. We also report measurements of inclusive hadron production cross sections and angular distributions in e+e- collisions at around 10 GeV. These measurements shed light on fundamental questions of hadronization and fragmentation processes and help test cross-section scaling properties.
        Speakers: Andreas Hafner (M), Dr Andreas Martin Hafner (Mainz University (DE))
        Slides
      • 17:15
        Study of QCD in gamma gamma to pseudoscalar meson pair processes 15m
        We report QCD studies of pseudoscalar meson pair production in two-photon collisions at the Belle experiment. Differential cross sections have been measured for $\pi^+ \pi^-$, $\pi^0 \pi^0$, $K^+ K^-$, $K_S K_S$, $\eta \pi^0$ and $\eta \eta$ final states. Their $W$ dependence and angular distributions are compared with perturbative and non-perturbative QCD predictions at $(2.4-3.1)\ {\rm GeV} < W < (3.3-4.1)\ {\rm GeV}$, where $W$ is the invariant mass of the two-photon system. Existing predictions fail systematically to describe our measurements.
        Speaker: Dr Hideyuki Nakazawa (National Central University (JP))
        Slides
    • 09:00 18:00
      Room 218 - Future Accelerators - Detectors and Computing for HEP - TR14&13 Room 218

      Room 218

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        The CLIC project, status and prospects 15m
        The Compact Linear Collider (CLIC) project explores the possibility of constructing a future multi-TeV linear electron-positron collider. The CLIC-concept is based on high gradient normal-conducting accelerating structures. The RF power for the acceleration of the colliding beams is produced by a novel two beam acceleration scheme, where power is extracted from a high current drive beam that runs parallel with the main linac. In order to establish the feasibility of this concept a number of key issues have been addressed, covering concept verification, accelerator parameters, component development, alignment and stability. The CLIC physics potential and main detector issues, as well as possible implementation stages are being studied in parallel. A summary of the progress and status of the corresponding studies will be given, as well as an outline of the preparation and work towards developing a CLIC implementation plan by 2016.
        Speaker: Prof. Steinar Stapnes (CERN (CH))
        Slides
      • 09:15
        Development of beam-collision feedback systems for future lepton colliders 15m
        Future lepton colliders such as the International Linear Collider (ILC), and the Compact Linear Collider (CLIC) require nanometer-sized beams at the interaction point (IP). We report on the design, protoyping and testing of beam-based feedback systems for steering the beams into collision at the IP so as to maximise the luminosity performance of the colliders. Both all-analogue and digital feedback prototypes have been built and tested for CLIC and ILC, respectively. The latency of such systems needs to be very low so as to match the bunch spacing and bunch-train length. We report on the achievement of systems with 130ns and 23ns latency that meet the beam position resolution and beam kick requirements of both ILC and CLIC, respectively; the prototypes were tested with ILC- and CLIC-like beams at the Accelerator Test Facility at KEK. We have simulated the measured performance and demonstrated the potential of the feedbacks to compensate for ground-motion disruption and recover almost all of the design luminosity.
        Speaker: Prof. Philip Burrows (University of Oxford (UK))
        Slides
      • 09:30
        Status of the SuperB project 15m
        The SuperB experiment is a next generation Super Flavour Factory expected to accumulate 75ab^-1 of data at the Y(4S) in five years of nominal running. This facility will be constructed at the Cabibbo Lab in the Rome Tor Vergata Campus and will be operational later this decade. In addition to running at the Y(4S), SuperB will be able to accumulate data at the psi(3770) and above and below the Y(4S). A polarized electron beam enables unique physics opportunities at SuperB. The main physics goal of SuperB is to unravel the detailed structure physics BSM likely to be discovered soon at the LHC, or to indirectly extend this search well beyond the TeV scale.
        Speaker: Umberto Dosselli (Universita e INFN (IT))
        Slides
      • 09:45
        Precision Polarimetry for Electron Positron Linear Colliders 15m
        Beam polarisation is an important ingredient of the physics progam of future Electron Positron Linear Colliders. In order to fully exploit the benefits of the polarised beams, the luminosity weighted average polarisation needs to be known to 0.25% or even 0.1% at the ILC, while a few percent seem achievable at CLIC. We will present the polarimetry concept for the Beam Delivery Systems of both machines, including the design of the Compton polarimeters and recent progress in their calibration strategies, the possibilities to calibrate the absolute scale of the polarimeters against e+e- collision data and the necessary simulations of spin dynamics in the BDS and at the e+e- interaction point.
        Speaker: Dr Jenny List (DESY (DE))
        Slides
      • 10:00
        Spin tracking at Future e+e- Colliders 15m
        In order to exploit the full potential of proposed future high-energy electron-positron colliders, precise knowledge of the beam polarization is required as it evolves throughout the entire machine. Here we discuss global spin tracking efforts in the ILC design from source to Interaction Point. Numerical results are presented for the latest International Linear Collider (ILC) and Compact Linear Collider (CLIC) machine parameters. A GEANT model that transports spin is used for the positron sources. Depolarisation studies in the ring and through the spin rotators shows that polarization is maintained within budget. Spin tracking simulations through the Beam Delivery System reveals the importance of orbit correction and nanometer stabilization of final focus quadrupoles. Interaction Point beam-beam effects lead to significant depolarisation, the knowledge of which is obtained through a combination of custom designed polarimeters and analysis of W pair production data. Progress towards a global simulation package which incorporates specific spin tracking codes is discussed.
        Speaker: Dr Anthony Hartin (DESY (DE))
        Slides
      • 10:15
        Heavy ion collider facility NICA at JINR (Dubna): status and development 15m
        New large accelerator complex: heavy ion collider facility NICA (Nuclotron-based Ion Collider fAcility) is under active development now at JINR (Dubna). The main goal of the project is to start in the coming 5 years experimental study of hot and dense strongly interacting baryonic matter and search for possible signs of the mixed phase and critical endpoint in heavy ion collisions (Energy √s_NN = 4-11 GeV for Au^79+ nuclei at average luminosity of L = 10^27 cm^-2 s^-1). Another physics goal of NICA are future experimental studies of spin physics with colliding beams of polarized protons and light nuclei, and also fixed target experiments on ion beams. The report presents main characteristics of the project: collider facility scheme, operation scenario, proposed methods of accumulation of intense bunched ion beam, application of different RF technique and beam cooling methods to achieve maximal luminosity in the total energy range. Status of R&D and plans of the project development are presented as well.
        Speaker: Dr Grigory Trubnikov (Joint Institute for Nuclear Research (RU))
        Slides
      • 10:30
        Prospective for A Fixed-Target ExpeRiment at the LHC: AFTER @ LHC 15m
        We discuss the possibility of the conception of a multi-purpose fixed-target experiment with the proton or lead ion LHC beams extracted by bent a crystal. This mature extraction technique offers an ideal way to obtain a clean and very collimated high-energy beam, without altering at all the performance of the LHC [1,2,3]. It has been successfully tested at SPS (450 GeV) and at the Tevatron (900 GeV) and future tests at the LHC are planned (7 TeV). As simple as it seems, the multi-TeV LHC beams will allow for the most energetic fixed-target experiments ever performed. Such an experiment, tentatively named AFTER for “A Fixed-Target ExperRiment”, gives access to new domains of particle and nuclear physics complementing that of collider experiments [4], in particular that of Brookhaven's Relativistic Heavy Ion Collider (RHIC) and the projects of Electron-ion colliders (EIC). We have already evaluated that the instantaneous luminosity achievable with AFTER using typical targets would surpass that of RHIC by more than 3 orders of magnitude. This provides a quarkonium and heavy-flavour observatory [5] in pp and pA collisions where, by instrumenting the target-rapidity region, gluon and heavy-quark distributions of the proton, the neutron and the nuclei can be accessed at large x and even at x larger than unity in the nuclear case. The fixed-target mode also has the advantage to allow for spin measurements with polarized target and for an access over the full backward rapidity domain up to x_F ~ -1. The nuclear target-species versatility provides a unique opportunity to study nuclear matter versus the features of the hot and dense matter formed in heavy-ion collisions, including the formation of the quark-gluon plasma. During the one-month lead runs, PbA collisions can be studied at a luminosity comparable to that of RHIC and the LHC over the full range of target-rapidity domain with a large variety of nuclei. Modern detection technology should allow for the study of quarkonium excited states, in particular the chi(c) and chi(b) resonances, even in the challenging high-multiplicity environment of pA and PbA collisions, thanks to the boost of the fixed-target mode. We will discuss a tentative design for AFTER, and report the projected detector performances from the first preliminary simulations.
        Speaker: Dr Jean-Philippe Lansberg (Institut de Physique Nucléaire d'Orsay / IN2P3-CNRS (FR))
        Slides
      • 10:45
        Refreshment Break 15m
      • 11:00
        LHC Status and Future Upgrade Plans 30m
        The Large-Hadron-Collider (LHC) operated at CERN has been re-commissioned after a short scheduled technical maintenance stop and reached its previous peak performance safely and after only about a month in the beginning of 2012. The operational experience gained during the previous year and additional analysis of the robustness of the magnet interconnections as well as the measured available triplet aperture allowed further performance improvements, pushing the hadron-hadron centre-of-mass energy to 8 TeV, reduced final focus beta-functions of 0.6 m in the two high-luminosity insertions. In combination with the significantly reduced and consistently produced transverse beam emittances delivered by the LHC injector chain, these allowed new peak luminosity records beyond 0.5e34 cm^2 s^1 necessary to achieve the challenging integrated luminosity targets for 2012. This contribution summarises the status of the ongoing accelerator and beam optimisations, the planned first long shut-down (LS1) in 2013-2014 to improve the magnet interconnection and protection system in view of safely reaching the LHC design collision energy, as well as the already approved upgrade targeting the modification of the existing high-luminosity insertions. In addition, depending on the outcome of the multitude of ongoing HEP studies -- notably the Higgs search, future upgrade options are being discussed that may require more substantial modifications to the existing accelerator or go beyond the present LHC design.
        Speaker: Dr Ralph Steinhagen (CERN (CH))
        Slides
      • 11:30
        Design Concepts for a Large Hadron Electron Collider 15m
        A Conceptual Design Report has been completed for a new electron-proton and electron-ion collider, which achieves a cms energy of 1.3 TeV in ep using the high energy beams of the LHC. Designed for synchronous ep and pp operation, the LHeC will be a high luminosity collider with a wide ranging physics program on high precision deep inelastic scattering and new physics. The electron beam is designed as an energy recovery linac in a racetrack configuration with triple return arcs. As well as a summary of the Conceptual Design, the next steps towards a technical design of the LHeC are presented.
        Speaker: Prof. Max Klein (CERN)
        Slides
      • 11:45
        The High Intensity Future of Fermilab 15m
        Fermilab’s high intensity future is “Project-X” which is a US led initiative with strong international participation that aims to realize a next generation proton source that will dramatically extend the reach of Intensity Frontier research. The state of the art in Super-Conducting RF has advanced to a point where it can be considered and implemented as the core enabling technology for a next generation multi-megawatt proton source--reliably delivering unprecedented beam power at duty factors ranging from 0.001% to 100% . The base Super-Conducting RF technology also supports flexible beam-timing configurations among simultaneous experiments, allowing a broad range of experiments to develop and operate in parallel. The US Department Of Energy Office of High Energy Physics and its advisory bodies have recognized this potential and are supporting R&D for Project-X that could lead to a construction start as early as 2017. Project-X will provide multi-megawatt proton beams from the Fermilab Main Injector over the energy range 60-120 GeV simultaneous with multi-megawatt protons beams 1-3 GeV (kinetic) with very flexible beam-timing characteristics as well as substantial beam power at 8 GeV. The Project-X research program includes world leading sensitivity in long-baseline and short-baseline neutrino experiments, a rich program of ultra-rare muon and kaon decays and opportunities for next-generation electric dipole moment experiments and other nuclear/particle physics probes that reach far beyond the Standard Model. The status and prospects of developing the accelerator complex and the research program will be presented.
        Speaker: Dr Young-Kee Kim (Fermi National Accelerator Laboratory (US))
        Slides
      • 12:00
        Progress of MICE, the International Muon Ionization Cooling Experiment 15m
        Ionization Cooling is the only practical solution to preparing high brilliance muon beams for a neutrino factory or muon collider. The muon ionization cooling experiment (MICE) is under development at the Rutherford Appleton Laboratory (UK) by an international collaboration. The muon beam line has been commissioned and, for the first time, measurements of beam emittance with particle physics detectors have been performed. The remaining apparatus is currently under construction. First results with a liquid-hydrogen absorber will be produced in 2013; a couple of years later a full cell of a representative ionization cooling channel, including RF re-acceleration, will be in operation. The design offers opportunities to observe cooling with various absorbers and several optics configurations. Results will be compared with detailed simulations of cooling channel performance to ensure full understanding of the cooling process.
        Speaker: Prof. Kenneth Long (Imperial College London (UK))
        Slides
      • 12:15
        The Accelerator Complex from the International Design Study of the Neutrino Factory 15m
        The Neutrino Factory produces high-energy neutrino beams with a well-defined flavour content and energy spectrum from the decay of intense, high-energy, stored muon beams to establish CP violation in the neutrino sector. The International Design Study for the Neutrino Factory (the IDS-NF) will provide a Reference Design Report (RDR) for the facility. The present baseline design has been re-evaluated to take into account the recent measurements of theta_13. This talk describes the status of the accelerator facility and the accelerator subsystems of which it is comprised. This is a modification of the facility described in the Interim Design Report (IDR) completed in 2011. The accelerator facility will deliver 10^21 muon decays per year from 10 GeV stored muon beams. The straight sections of the storage ring point to a 100 kton Magnetised Iron Neutrino Detector (MIND) at a distance of 2000—2500 km from the source. The accelerator-physics challenges, and the R&D underway to meet them, will be described together with alternative designs that are being developed to mitigate the technical risks that some of the subsystems present.
        Speaker: Dr Paul Soler Jermyn (University of Glasgow (UK))
        Slides
      • 12:30
        A new intense DC muon beam from a pion capture solenoid, MuSIC 15m
        MuSIC is a project to provide the world's highest-intensity muon beam with continuous time structure at Research Center of Nuclear Physics (RCNP) of Osaka University, Japan. A pion capture system using a superconducting solenoid magnet and a part of superconducting muon transport solenoid channel have been build in 2010. The highest muon production efficiency was demonstrated by the beam test carried out in February 2011. The result concludes that the MuSIC can provide more than 10^9 muons/sec using a 400W proton beam. The pion capture system is one of very important technologies for future muon programs such as moon to electron conversion searches, neutrino factories, and a muon collider. The MuSIC built the first pion capture system and demonstrate its potential to provide an intense muon beam. The construction on the entire beam channel of the MuSIC will be finished in five years. We plan to carry out not only an experiment to search the lepton flavor violating process but also other experiments for muon science and their applications using the intense muon beam at RCNP.
        Speaker: Ms Yuko Hino (Osaka University (JP))
        Slides
      • 12:45
        Lunch Break 1h
      • 13:45
        The DPHEP Study Group: Data Preservation in High Energy Physics 15m
        While the current focus is on the LHC at CERN, in the current period several important and unique experimental programs at other facilities are coming to an end, including those at HERA, b-factories and the Tevatron. However, until recently no coherent strategy existed for data preservation and re-use, and many important and complex past data sets have simply been lost. To address this problem, an inter experimental Study Group on HEP data preservation and long-term analysis, DPHEP, was convened in 2009 as a panel of the International Committee for Future Accelerators (ICFA). The group was formed by large collider-based experiments and investigated the technical and organisational aspects of the HEP data preservation. The aims of the study group include to confront the data models, clarify the concepts, set a common language and investigate the technical aspects of data preservation in HEP. The experiments BaBar, Belle, BES-III, CLAS, CLEO, CDF, D0, H1 and ZEUS are all represented in DPHEP, with representatives from the LHC experiments ALICE, ATLAS, CMS and LHCb having joined the study group in 2011. The associated computing centres at CERN (Switzerland/France), DESY (Germany), Fermilab (USA), IHEP (China), JLAB (USA), KEK (Japan) and SLAC (USA) are also represented in DPHEP. An intermediate report was released in November 2009 addressing the general issues of data preservation in HEP. A more complete report is to be released in the first half of 2012, extending and building upon the initial findings. An analysis of the research case for data preservation is provided and a detailed description of the various projects at experiment, laboratory and international levels. In addition, concrete proposal for an international organisation in charge with the data management and policies in high-energy physics are provided.
        Speaker: Dr David South (DESY (DE))
        Slides
      • 14:00
        Computing at SuperB 15m
        Developing a computing model for the next generation of Super Flavor Factories, like SuperB and SuperKEKB, present significant challenges. With a nominal luminosity above 10^36 cm^-2 s^-1, we estimate that, after few years of operation, the size of the data sample will be of the order of 500 PB and the amount of CPU required to process it will be close to 5000 KHep-Spec06. The new many and multi core technologies need to be effectively exploited in order to manage very large data set and this has a potential large impact on the computing model for SuperB. In addition, the computing resorces available to SuperB, as is already the case for LHC experiments, will be distributed and accessed through a Grid or eventually a cloud infrastructure and a suite of efficient and reliable tools need to be provided to the users. A dedicated R&D program to explore these issues is in progress and it is presented here.
        Speaker: Dr Domenico Del Prete (INFN Napoli (IT))
        Slides
      • 14:15
        Data Preparation for the CMS detector at 8TeV at the LHC. 15m
        The CMS detector, currently taking data at the LHC in Geneva, is a very complex apparatus composed of more than 70 million acquisition channels. Fast and efficient methods for the calibration and the alignment of the detector are a key asset to exploit its full physics potential. Moreover, a reliable infrastructure for the monitoring of the data quality and for their validation are instrumental to ensure timely preparation of results for conferences and publications. The CMS experiment has set up a powerful framework in order to cope with all these requirements and in 2012 it had to consolidate and optimize all the workflows to withstand the higher luminosity and energy delivered by the LHC machine. The reconstruction algorithms have been optimized for the higher occupancies without compromising the physics performance. A MonteCarlo production with a statistic comparable to the collision data has been prepared and fully validated. This contribution will cover the development and operational aspects of the offline workflows reporting about the CMS performance and the experience gained during the data taking.
        Speaker: Dr Jean-Roch Vlimant (CERN (CH))
        Slides
      • 14:30
        The Present and Future Challenges of Distributed Computing in the ATLAS experiment 15m
        The ATLAS experiment has collected more than 5 fb-1 of data in 2011 at the energy of 7 TeV. Several billions of events had been promptly reconstructed and stored in the ATLAS remote data centers spanning tens of petabytes of disk and tape storage. In addition, a similar amount of data has been simulated on the Grid to study the detector performance and efficiencies. The data processing and distribution on the Grid sites with more than 100.000 computing cores is centrally controlled by the system developed by ATLAS, managing a coherent data processing and analysis of almost one million jobs daily. An increased collision energy of 8 TeV in 2012 and much larger expected data collection rate due to improved LHC operation impose new requirements on the system and suggests a further evolution of the computing model to be able the meet the new challenges in the future. The experience of large-scale data processing and analysis on the Grid is presented through the evolving model and organization of the ATLAS Distributed Computing system.
        Speaker: Dr Ikuo Ueda (University of Tokyo (JP))
        Slides
      • 14:45
        Common Solutions to LHC Computing Problems 15m
        In this presentation we will discuss the process and some examples of the development of common solutions that face the LHC experiments. The LHC experiments have relied on common grid components since the design of the computing models. Recently there have been efforts to develop and support higher-level services that provide solutions to problems common to several experiments. We will discuss the process used to select prospective common solutions, some examples of successful common services, and some planning for future common development activities.
        Speaker: Dr Ian Fisk (Fermi National Accelerator Lab. (US))
        Slides
      • 15:00
        Any data, any time, any where 15m
        In this presentation we will discuss progress on providing access to CMS experiment data through the use of wide area transfer protocols directly from remote storage to a running application. This program of work has involved the deployment of infrastructure on facilities in both the US and in Europe, the optimization of the application to make more efficient use of a higher latency connection, and the demonstration of a variety of use cases to showcase the value of this functionality. The project is at the level where several of the intended applications are used in production running, and several of the more ambitious techniques are in the prototype phase.
        Speaker: Prof. Sudhir Malik (University of Nebraska-Lincoln (US))
        Slides
      • 15:15
        The Large Hadron electron Collider Detector Design Concept (LHeC Study Group) 15m
        The Conceptual Design Report for the Large Hadron Electron Collider has recently been released. This contribution summarises the part of the report covering design concepts for a new detector, which combines the demands of very high precision with those of large acceptance into a novel device for electron-proton physics at TeV energies. The physics and technical requirements, choices of detector techniques and the integration of the detector with the 3 beam interaction region including its magnet designs are presented.
        Speaker: Dr Alessandro Polini (DESY (DE) & CERN (CH))
        Slides
      • 15:30
        The MICE beamline instrumentation (trackers and PID) for precise emittance measurement. 15m
        The International Muon Ionization Cooling Experiment (MICE) will carry out a systematic investigation of ionization cooling of a muon beam, for the future Neutrino Factory and the Muon Collider. As the emittance measurement will be done on a particle-by-particle basis, a sophisticated beam instrumentation is needed to measure both particle coordinates and timing vs RF in a harsh environment due to high particle rates, fringe magnetic fields and RF backgrounds. A PID system, based on three time-of-flight stations (with resolutions up to 50-60 ps), two Aerogel Cerenkov counters and a KLOE-like calorimeter (KL) has been constructed and has allowed the commissioning of the MICE muon beamline in 2010. It will be soon followed by an Electron Muon Ranger to determine the muon range at the apparatus downstream end and later by two tracker detectors to trace incoming particles inside two high-field superconducting solenoids. Detector performances will be shown and their use for the beamline characterization fully illustrated.
        Speaker: Dr Paul Soler Jermyn (University of Glasgow (UK))
        Slides
      • 15:45
        Refreshment Break 15m
      • 16:00
        Belle II at SuperKEKB 15m
        The next generation of B factories (so called super B factories) are designed to accummulate a 50 times larger data sample, corresponding to an integrated luminosity of 50 ab^-1. To achieve the necessary increase of event rates by a factor of 40, a substantial upgrade is required both of the accelerator complex as well as of the detector. To maintain the excellent performance of the detector, the critical issue will be to mitigate the effects of higher backgrounds (by a factor of 10 to 20), leading to an increase in occupancy and radiation damage, as well as fake hits and pile-up noise in the electro-magnetic calorimeter. Higher event rates require substantial modifications in the trigger scheme, DAQ and computing relative to the current experiments. In addition, improved vertex detection and hadron identification are needed, and similarly good (or better) hermeticity is required. We will discuss the requirements for the SuperKEKB accelerator and for the Belle II detector, both under construction at KEK, and review several innovative aproaches in detector design. Finally, the status of the project will be presented together with the plans for the future.
        Speaker: Prof. Martin Sevior (University of Melbourne (AU))
        Slides
      • 16:15
        The DEPFET pixel vertex detector for the Belle II experiment at SuperKEKB 15m
        The luminosity upgrade of the KEKB accelerator towards SuperKEKB opens up new possibilities for physics at the intensity frontier. SuperKEKB will provide an instantaneous luminosity of 8x10^35 1/cm2/s which allows to increase the integrated luminosity of 1ab-1 achieved at the BELLE detector towards 50 ab-1 at BELLE II. The increased luminosity poses challenges to all subsystems like DAQ, trigger and sub detectors. Especially the innermost detector will be faced with a significant background due to two-photon pair production, synchrotron radiation, and intra-beam scattering. For precise vertex reconstruction, this requires using pixel detector technologies capable to deal with these issues while maintaining physics performance adequate for a precision detector. The DEPFET technology offers a unique set of advantages as low power dissipation in the active area, large device size, radiation tolerance and a thinning procedure which allows tailoring the thickness of the device over a wide range. Using this technology the impact parameter resolution of the combined silicon detector of Belle II can be improved significantly compared to the previous experiment even in the challenging high luminosity environment. The DEPFET pixel detector (PXD) will offer a granularity of 8MPix and a frame time of 20µs, this requires a sophisticated scheme to handle the data flow. I will give an overview how the data is processed from the zero suppression on the module till the online pattern recognition to reject background. As the first physics runs of SuperKEKB are foreseen for 2015 the PXD project currently moves from the R&D- into the construction phase. This means that many engineering tasks are close to finalization. I will present an overview of the electro-mechanical integration of the DEPFET PXD into the BELLE II experiment, as well as the cooling scheme and the power distribution.
        Speaker: Dr Stefan; on behalf of the DEPFET collaboration Rummel (LMU Munich (DE))
        Slides
      • 16:30
        The SiD Detector Concept for the International Linear Collider 20m
        The SiD Detector is one of the two validated concepts for experiments at the future International Linear Collider. The SiD detector concept has been used to perform physics and benchmark studies at a 500 Gev ILC and a 3TeV CLIC electron positron collider. SiD is a highly performant, compact, cost-constrained, detector design. It is designed to make precision measurements and be sensitive to a wide range of new phenomena. The all silicon vertexing and tracking system is the signature component of the design and is immersed in a 5 Tesla field from the superconducting solenoid. Excellent momentum resolution is achieved, as is sensitivity to single bunch crossings. The calorimetry is based on the particle flow approach to achieve excellent jet energy resolution, using a high degree of longitudinal and transverse segmentation. The iron flux return, a component of the SiD self-shielding, is instrumented for muon identification and momentum measurement. The complete detector is designed for rapid push-pull operation. The status of each subsystem of the SiD, the benchmark physics studies, and the machine-detector interface, will be discussed together with completed studies for the ILC LOI, the CLIC CDR and progress towards the ILC Detailed Baseline Design to be completed in late 2012.
        Speaker: Prof. Andy White (University of Texas at Arlington (US))
        Slides
      • 16:50
        The ILD detector concept for the ILC 20m
        The ILD detector concept is a proposal for a detector at an electron – positron linear collider, in particular the international linear collider, ILC. It has been conceived as an experiment optimized for precision physics in the comparatively clean environment of electron positron collisions. The particle flow concept has played a central role in the overall optimization of the concept, which is reflected in the proposal of a highly granular calorimeter with exceptional performance. ILD in addition has put special emphasis on excellent vertexing capabilities, and a highly integrated efficient tracking system, build around a large volume advanced time projection chamber. Over the last years the ILD concept has been developed to a point where not only a concept of the detector has been developed, but where through a series of prototyping experiments and detailed simulation a solid understanding of the overall system has been established. Realistic technologies are proposed for each sub-detector, and are validated through test experiments and simulation. A detailed model of the integrated detector has been developed and has been used to study and understand the behavior of the complete system. A series of benchmark physics reactions have been studied in full simulation to illustrate the power of the proposed detector concept. In this talk the philosophy of the ILD detector concept, its implementation and its anticipated performance are discussed. In this presentation the overall concept of the detector is developed. Special emphasis is given to demonstrate that the key components of the system have passed stringent performance tests and have demonstrated their performance. Results from recent work on most system, in particular the vertex detector and the time projection chamber, are presented.
        Speaker: Dr Tomohiko Tanabe (ICEPP University of Tokyo (JP))
        Slides
      • 17:10
        Physics and Detectors at CLIC 20m
        The Compact Linear Collider CLIC with e+e- collisions up to 3 TeV in energy is designed to precisely explore New Physics at the TeV scale as well as Standard Model Physics such as the Higgs Mechanism. It will be capable of precisely measuring the masses and couplings of new particles, the mass, decay branching ratios and the self-coupling of the Higgs Boson as well as the parameters of the top quark. The detector systems at this collider have to provide highly efficient tracking and excellent jet energy resolution and hermeticity for multi-TeV final states with multiple jets and leptons as well as precise flavor tagging. In addition, the detector systems have to be capable of performing in an environment of large beam-induced backgrounds at a bunch crossing frequency of 2 GHz. Based on the ILC detector concepts, the CLIC detectors are adapted to meet this challenges with precise timing, dense calorimeter systems using Tungsten absorbers and sophisticated event reconstruction techniques based on particle flow algorithms with the inclusion of timing information. We will discuss the physics program of CLIC in view of a realistic implementation in a staged construction, and present highlights of the detectors and reconstruction algorithms developed during the recently completed conceptual design phase of CLIC.
        Speaker: Dr Frank Simon (Max-Planck-Institut für Physik (DE))
        Slides
      • 17:30
        Performance of the CALICE analogue calorimeters and tests of GEANT4 15m
        The CALICE collaboration has developed highly granular calorimeter prototypes to evaluate technologies for experiments at a future lepton collider, and measured their performance in test beams. One important use of these data is the validation of the physics models in GEANT4, especially those related to hadronic showers. This validation is crucial if Monte Carlo simulations are to be used to optimise the design of detectors for ILC or CLIC. In this talk we discuss several features of showers recorded in the CALICE calorimeters using analogue readout. These include both a Si-W electromagnetic calorimeter, a tungsten ECAL with scintillator strip readout, and a hadronic calorimeter instrumented with scintillator pads and using either iron or tungsten absorbers. The performance of these different technologies are compared. A common feature of all these designs is their high spatial resolution, optimised for particle flow reconstrction of jets. This granularity permits the investigation of shower shapes in unprecedented detail, and the resolution of detailed substructure within the shower, such as track segments. Many of these features present new challenges to the simulation models. Furthermore, the high level of detail recorded within the showers can be exploited in the form of "software compensation". A variety of techniques can be used to discriminate between the different components within showers and hence to weight them differently so as to improve the energy resolution. We also report on recent tests of the time-structure of hadronic showers in a tungsten calorimeter - a topic of especial interest for a CLIC detector where accurate time stamping is required.
        Speaker: Dr Tamaki Yoshioka (Kyushu University (JP))
        Slides
      • 17:45
        High Resolution Hadron Calorimetry 15m
        We review the physics foundations of hadron calorimetry with the help of detailed simulation based on GEANT5. Detailed studies of spatial and temporal development of hadronic showers are presented and the contributions of various particles species to the observed signals are evaluated. We identify the principal contributions to the energy resolutions and demonstrate the importance of the total absorption and calorimetry in attaining high energy resolution. Furthermore we demonstrate that the additional information provided by Cherenkov light in addition to the scintillation light makes it possible to correct, on the event-by-event basis, for the loss of the energy for particles production and nuclear binding energy and to attain the energy resolution of the order of 10%/sqrt(E). We present the performance of a dual readout total absorption calorimeter for single particles of different kinds and energies as well as for the jets. We discuss the practical implementation of a calorimeter in a colliding beam experiment. Leakage of energy due to the finite thickness of the calorimeter is likely to be the dominant contribution to the energy resolution and we discuss possible ways to mitigate this contribution. We present a program of a studies of various systematic effects potentially relevant to the energy resolution, like the non-linearity of response of inorganic scintillators to heavily ionizing particles.
        Speaker: Dr Adam Para (Fermi National Accelerator Laboratory (US))
        Slides
    • 09:00 17:55
      Room 219 - BSM - Non-SUSY - TR3 Room 219

      Room 219

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        Quantum corrections to broken N=8 supergravity 20m
        We show that, for all tachyon-free classical Minkowski vacua with four-dimensional spontaneously broken N=8 supergravity, the one-loop effective potential is calculable and finite. We also find that, in all presently known examples, it is negative-definite.
        Speaker: Prof. Fabio Zwirner (University of Padova and INFN (IT))
        Slides
      • 09:20
        Search for First Generation Leptoquarks in ep Collisions at HERA 15m
        A search for first generation scalar and vector leptoquarks produced in ep collisions is performed by the H1 experiment at HERA. The full H1 data sample is used in the analysis, corresponding to an integrated luminosity of 446 pb^-1. No evidence for the production of leptoquarks is observed in final states with a large transverse momentum electron or with large missing transverse momentum, and constraints on leptoquark models are derived. For leptoquark couplings of electromagnetic strength lambda= 0:3, first generation leptoquarks with masses up to 800 GeV are excluded at 95% condence level.
        Speaker: Dr David South (DESY (DE))
        Slides
      • 09:35
        A search for resonance decays to lepton+jet at HERA and limits on leptoquarks 15m
        A search for first generation leptoquarks was performed in polarized electron-proton collider data recorded with the ZEUS detector at HERA in the years 2003-2007. They were analyzed for final states with an electron and jets or with missing transverse momentum and jets and a search for resonance structures or other deviations from the Standard Model predictions in the spectra of the invariant mass of lepton and jets was performed. No evidence for leptoquark signals was found. The data were combined with the previously taken data at HERA corresponding to an integrated luminosity of 0.5fb-1 and limits were set on the Yukawa coupling lambda as a function of the leptoquark mass for different leptoquark types within the Buchmueller-Rueckl-Wyler model.
        Speaker: Dr Katarzyna Wichmann (DESY)
        Slides
      • 09:50
        Search for First Generation Leptoquark Pair Production in the Electron + Missing Energy + Jets Final State 15m
        We present a search for the pair production of first generation scalar leptoquarks (LQ) in data corresponding to an integrated luminosity of 5.4 fb^-1 collected with the D0 detector at the Fermilab Tevatron Collider in ppbar collisions at sqrt(s)=1.96 TeV. In the channel LQ \bar{LQ} --> e nu_e q q', where q, q' are u or d quarks, no significant excess of data over background is observed, and we set a 95% C.L. lower limit of 326 GeV on the leptoquark mass, assuming equal probabilities of leptoquark decays to e q and nu_e q'.
        Speaker: Dr Bjorn Penning (Fermi National Accelerator Laboratory (US))
        Slides
      • 10:05
        Search for leptoquarks and heavy neutrino 15m
        We present results of searches with leptons, jets and missing transverse energy in the final state sensitive to the existence of leptoquarks and heavy right majorana neutrinos. The full sample of 5 fb-1 of pp collisions recorded with CMS in 2011 at the center-of-mass energy of 7 TeV has been used.
        Speaker: Dr James Francis Hirschauer (Fermi National Accelerator Laboratory (US))
        Slides
      • 10:20
        Searches for new Physics in events decaying to tau leptons with the ATLAS detector 15m
        We report on searches of heavy particles decay to a pair of taus as well as a search for third-generation leptoquarks decaying to a jet and a tau lepton. The studies reported use the full data sample recorded in 2011 at sqrt(s)=7 TeV centre-of-mass energy by the ATLAS experiment at the LHC.
        Speaker: Dr Peter Wagner (University of Pennsylvania (US))
        Slides
      • 10:35
        Discovering Colorons at the Large Hadron Collider 15m
        We investigate the prospects for the discovery of massive hyper-gluons at the CERN Large Hadron Collider with $\sqrt{s} = 14$ TeV. A phenomenological Lagrangian is adopted to evaluate the cross section of a pair of colored vector bosons (colorons, $\tilde{\rho}$) decaying into four colored scalar resonances (hyper-pions, $\tilde{\pi}$), which then decay into eight gluons. We include the dominant physics background from the production of $8g,7g1q, 6g2q$, and $5g3q$, and determine the masses of $\tilde{\pi}$ and $\tilde{\rho}$ where discovery is possible. For example, we find that a 5$\sigma$ signal can be established for $M_{\tilde{\pi}} \alt 495$ GeV ($M_{\tilde{\rho}} \alt 1650$ GeV). More generally we give the reach of this process for a selection of possible cuts and integrated luminosities.
        Speaker: Prof. Chung Kao (University of Oklahoma (US))
        Slides
      • 10:50
        Refreshment Break 10m
      • 11:00
        Search for resonances in lepton pairs and photon pairs with the ATLAS detector 15m
        Resonances decaying into a pair of particles are an obvious place to look for phenomena beyond the Standard Model. This talk summarizes recent results on searches for resonances in lepton pairs, leptons and missing transverse energy and pairs of photons. The models considered are the Z' and W', the Randall-Sundrum gravitons as well as the ADD large extra dimension scenario. The talk presents results from searches for new physics in final states containing pairs of electrons or muons using the full data sample recorded in 2011 at sqrt(s)=7 TeV centre-of-mass energy by the ATLAS experiment at the LHC. If ready it will also add a first look at the data collected in early 2012.
        Speaker: Dr Xabier Anduaga Del Popolo (Universidad Nacional de La Plata (AR))
        Slides
      • 11:15
        Search for resonant diboson production with the ATLAS detector 15m
        The study of electroweak boson pair production is a powerful test of the spontaneously broken gauge symmetry of the Standard Model (SM) and can be used to search for phenomena beyond the SM. Heavy articles decaying to gauge boson pairs are predicted by many scenarios of new physics, including Extra Dimensions, and Technicolor models. We present generic searches for a heavy particle decaying to a pair of boson. The talk presents results from searches done in several gauge bosons decay channels using the data sample recorded in 2011 at sqrt(s)=7 TeV centre-of-mass energy by the ATLAS experiment at the LHC.
        Speaker: Mr Giovanni Zevi Della Porta (Harvard University (US))
        Slides
      • 11:30
        Z' production at LHC in an extended MSSM 15m
        Searching for heavy neutral gauge bosons Z', predicted in extensions of the Standard Model based on a U' gauge symmetry, is among the main new physics investigations undertaken by the experiments at the Tevatron and at the Large Hadron Collider. We study Z' phenomenology at hadron colliders according to several U'-based models and in the Sequential Standard Model. In particular, as far as its decay is concerned, we shall include possible Z' decays into supersymmetric particles, besides the Standard Model modes so far investigated. We shall point out the new features of the MSSM, once it is extended by means of a U' group, and consider a few benchmarks points in the parameter space. As for Z' decays into sfermions, we shall account for the D-term contribution, due to the breaking of U', to slepton and squark masses. Results on branching ratios and cross sections will be presented, as a function of the MSSM and U' parameters, which will be varied within suitable ranges. We shall pay special attention to the decay into neutralino and charged-slepton pairs and gauge the feasibility to discover supersymmetry through this channel at the LHC.
        Speaker: Prof. Simonetta Gentile (Universita e INFN, Roma I (IT))
        Slides
      • 11:45
        Search for New Physics in the Dijet and photon+jet angular and mass distributions with the ATLAS detector 15m
        We study the mass and the angular distributions of pairs of jets and pairs of a photon and a jet to test several new physics hypotheses such as: excited quarks, quantum black holes or quark contact interactions. The most recent results will be presented.
        Speaker: Dr Dag Gillberg (Carleton University (CA))
        Slides
      • 12:00
        Search for new physics in events with two photons, many jets, and low missing transverse energy 15m
        Many supersymmetric and exotic models of new physics predict high-multiplicity events with leptons or electroweak gauge bosons and low missing transverse energy in the final state. We present results of a search for new physics at CMS in events with two photons and many hadronic jets with no requirement for large missing transverse energy.
        Speaker: Dr Marc Gabriel Weinberg (Florida State University (US))
        Slides
      • 12:15
        Search for new heavy gauge bosons at CMS 15m
        We present results of searches for new heavy gauge bosons decaying to dilepton, diphoton, lepton+MET, WZ, and ZZ final states. The full sample of 5 fb-1 of pp collisions at 7 TeV collected with CMS in 2011 have been analyzed as well as the new collisions recorded at 8 TeV in 2012.
        Speaker: Prof. Claudia Wulz (Austrian Academy of Sciences (AT))
        Slides
      • 12:30
        Search for hadronic resonances at CMS 15m
        We present results of searches for new heavy resonances decaying in hadronic final states. A variety of final states ranging from 2 jets up to 8 jets have been analyzed using the sample of 5 fb-1 of pp collisions at 7 TeV collected with CMS in 2011.
        Speaker: Dr Andreas Hinzmann (CERN)
        Slides
      • 12:45
        Lunch Break 1h
      • 13:45
        Search for the dark photon at Belle 15m
        Many extensions of the Standard Model introduce additional Higgs fields that include one or more dark Higgs bosons to the interactions. Such a gauge boson, also known as a dark photon, typically has very weak coupling to Standard Model particles. Experimental results from direct dark matter searches (e.g., DAMA/LIBRA) and other experimental anomalies (e.g., $g-2$) can be explained by such an additional interaction. Dark gauge bosons are typically of low mass, of order MeV to GeV. The ideal tools to discover such particles are therefore not high-energy collider experiments but lower-energy high-luminosity collider experiments like Belle and BaBar or dedicated fixed target experiments, several of which are planned or already under construction: at JLAB (Newport News, USA) and MAMI (Mainz, Germany), for example. In Belle, the search for the dark photon focuses on the so-called Higgs-strahlung channel, as proposed by Batell et al., where a dark photon and a dark Higgs are produced. Preliminary results will be presented and discussed.
        Speaker: Prof. Ming-Chuan Chang (Fu Jen Catholic University (TW))
        Slides
      • 14:00
        Searches for the pair production of dark matter particles at CMS 15m
        We present the results of searches for dark matter performed using data collected by the CMS experiment at the LHC in pp-collisions at a center-of-mass energy of 8 TeV. Searches for dark matter candidates are performed in events with missing transverse energy. Traditionally, searches for supersymmetry (SUSY), where the lightest SUSY particle is a good candidate for dark matter, have been performed. We present more model independent searches for the production of a pair of dark matter particles without making assumptions on the new physics model. The results are translated to bounds on the dark matter-nucleon scattering cross-section which can be directly compared to those from the direct detection and the indirect detection experiments, showing that the collider bounds are competitive and complementary to those from the other approaches.
        Speakers: SARAH MALIK (UNIVERSITY COLLEGE LONDON), Sarah Malik (Rockefeller University (US))
        Slides
      • 14:15
        Search for dark-sector Higgs and gauge bosons at BABAR 15m
        Recent astrophysical observations have motivated interest in models with a new, dark sector containing GeV-scale gauge and Higgs bosons. In such models, dark-sector photons typically mix with the standard-model photon, enabling their detection in e+e- collisions at BABAR, with very little background in many of the channels. We present searches for a dark-sector photon and a dark-sector Higgs boson and set stringent limits on the parameters of the model. One way to present our results is that if the dark-sector U(1) coupling is similar to the standard-model electromagnetic coupling, our limits on the mixing between the standard model and the dark sector are tighter than previous limits by up to two orders of magnitude, depending on the masses of the dark Higgs and dark boson.
        Speaker: Dr Adrian Bevan (Queen Mary University of London (UK))
        Slides
      • 14:30
        Searches for monojet events with missing transverse momentum with the ATLAS detector 15m
        Events composed of one high transverse energy jet and large missing transverse momentum represent one of the simplest and most striking signatures that can be observed at a hadron collider. The Standard Model contribution to such 'monojet' events is dominated by a Z decaying to a pair of neutrinos plus a recoiling jet. Several new physics models predict monojet events. They can occur via production of a jet in association with an invisible particle or via pair production of invisible particles recoiling against a hard radiative jet. The talk presents results from searches for new physics in monojet events using the full data sample recorded in 2011 at sqrt(s)=7 TeV centre-of-mass energy by the ATLAS experiment at the LHC.
        Speaker: Dr David Salek (CERN)
        Slides
      • 14:45
        Baryon asymmetry, dark matter and neutrino mass via exotic multiplets 15m
        We demonstrate that by adding three exotic fermion 5-plets and one scalar 6-plet to the standard model, a consistent solution to the problems of baryon asymmetry, dark matter and neutrino mass can be obtained. This is possible because renormalizability and standard model gauge invariance allow the lightest exotic particle in this model to be a dark matter candidate if the new 6-plet scalar does not develop a nonzero vacuum expectation value. Furthermore, light neutrino masses can be generated radiatively at one-loop while the baryon asymmetry is produced by the CP-violating decays of the second lightest exotic particle.
        Speaker: Mr Sandy Law (National Cheng Kung University (TW))
        Slides
      • 15:00
        Scale invariance and the electroweak symmetry breaking 15m
        Classical scale invariance maybe responsible for the quantum stability of the electroweak scale. We discuss realistic scale-invariant extensions of the Standard Model and the related phenomenology
        Speaker: Dr Archil Kobakhidze (University of Melbourne (AU))
        Slides
      • 15:15
        Refreshment Break 30m
      • 15:45
        Search for Universal Extra Dimensions in ppbar Collisions 15m
        We present a search for Kaluza-Klein (KK) particles predicted by models with universal extra dimensions (UED) using a data set corresponding to an integrated luminosity of 7.3 fb^-1, collected by the D0 detector at a pp center of mass energy of 1.96 TeV. The decay chain of KK particles can lead to a final state with two muons of the same charge. This signature is used to set a lower limit on the compactification scale of R^-1>260 GeV in a minimal UED model.
        Speaker: Dr Souza Santos Angelo (LAFEX, Centro Brasieiro de Pesquisas Fiscicas (BR))
        Slides
      • 16:00
        Search for extra dimensions at CMS 15m
        We present results for searches of the existence of large extra spatial dimensions. A variety of final states sensitive to both resonant and non-resonant enhancement of expected events have been analyzed. The full sample of 5 fb-1 of pp collisions recorded with CMS in 2011 at the center-of-mass-energy of 7 TeV has been used.
        Speaker: Dr Alessio Bonato (CERN)
        Slides
      • 16:15
        Large lepton mixing angles from a 4+1-dimensional SU(5) x A_{4} domain-wall braneworld model 15m
        We propose an extension of the 4+1D $SU(5)$ domain-wall braneworld of Davies, George and Volkas which includes the addition of a discrete $A_4$ flavor symmetry. We show that lepton mixing and light Majorana neutrino masses can be generated from the additional $A_{4}$ physics while at the same time sufficient parameter freedom can be maintained in the charged fermion sector to produce charged fermion masses and quark mixing naturally from the split fermion mechanism of Arkani-Hamed and Schmalz. Importantly, we show that the vacuum realignment problem typical of discrete flavor symmetry models of quark and lepton mixing can be solved by separating the appropriate flavons in the extra dimension, leading to exponentially sensitive suppression of the operators responsible for vacuum realignment.
        Speaker: Mr Callen Benjamin (University of Melbourne (AU))
        Slides
      • 16:30
        “Light” Higgs and warped models : Possible clues for future directions in HEP 15m
        Taking the indications for the lightish Higgs from the LHC experiments along with no signs of anything else new to about the TeV scale seriously and focusing on warped models, it’d appear that except for a radion/dilaton all other manifestations of KK-modes are a lot heavier in simplest models. Implications of such a radion will be discussed and what this scenatio may mean for the frontiers of high energy physics will be explored. This talk is partly based on work done in collaboration with Hooman Davoudiasl and Tom McElmurry.
        Speaker: Dr Amarjit Soni (Brookhaven National Laboratory (US))
        Slides
      • 16:45
        Search for compositeness and contact interactions in CMS 15m
        We present results of searches for compositeness and contact interactions in decays of excited quarks and leptons and inclusive spectra. The full data sample of 5 fb-1 of pp collisions collected in 2011 at a center-of-mass energy of 7 TeV with the CMS experiment have been used.
        Speaker: Dr Kerstin Hoepfner (Rheinisch-Westfaelische Tech. Hoch. Aachen (DE))
        Slides
      • 17:00
        Implications of 125 GeV Higgs in composite models 20m
        In this talk I will describe the implications of a 125 GeV Higgs in Composite Higgs Models. I will focus on the most relevant scenario where the Higgs is a pseudo-Goldstone boson and Standard Models fields are partially composite. Several models can be constructed characterized by the global symmetries and fermionic content of the composite sector. The Higgs can be light (~125 GeV) for a moderate tuning of parameters if light fermionic resonances are present. These could be seen at the present LHC run or early LHC14 run. Based on: arXiv:1110.1613, arXiv: 1205.0232
        Speaker: Mr Michele (CH) Redi (CERN)
        Slides
      • 17:20
        Search for Contact Interactions in e^{\pm}p Collisions at HERA 15m
        A search for physics beyond the Standard Model in neutral current deep inelastic scattering at high negative four-momentum transfer squared Q2 is performed in ep collisions at HERA. The differential cross section d\sigma/dQ2 , measured using the full H1 data sample corresponding to an integrated luminosity of 446 pb-1, is compared to the Standard Model prediction. No signicant deviation is observed. Limits on various models predicting new phenomena at high Q2 are derived. For general four-fermion eeqq contact interaction models, lower limits on the compositeness scale Lambda are set in the range 3:6 TeV to 7:2 TeV. Leptoquarks with masses MLQ and couplings lambda are constrained to M_LQ/lambda > 0:41-1.86 TeV and limits on squarks in R-parity violating supersymmetric models are derived. A lower limit on the gravitational scale in (4+n) dimensions of MS > 0:9 TeV is established for low-scale quantum gravity effects in models with large extra dimensions. For the light quark radius an upper bound of Rq < 0:65 x10^-18 m is determined.
        Speaker: Eram Syed Rizvi (Queen Mary, University of London)
        Slides
    • 09:00 18:00
      Room 220 Lattice QCD / B-Physics / CP Violation, etc -TR5&7&10 Room 220

      Room 220

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        The case for an excited "Higgs" within the standard model and particle/bound-state duality in the weak interactions 15m
        It is a remarkable fact that an interaction as weak as QED can sustain bound states. A similar feature naturally can also be expected for the weak interactions. In fact, it has been conjectured in the late seventies that to leading order in an expansion in the Higgs condensate such bound states will have the same mass as the corresponding elementary particle at tree level. Using non-perturbative numerical lattice simulations, evidence will be shown that this holds approximately true even beyond this leading order, provided an adequate renormalization scheme is chosen. This also resolves the apparent paradox that while the Higgs mass itself is both scheme and renormalization point dependent, the peak observed in a cross section is not. Interpreting the actual resonance as a Higgs-Higgs bound state dual to the elementary state gives a physical explanation for the presence of this peak. A similar construction can also be made for the W boson. Such an interpretation of the actually observed resonance peaks as bound states implies necessarily the possibility for excited states. If these should be sufficiently stable, they can show up as 'new particles' in the LHC data, even if they are completely within the standard model. Using once more lattice simulations some ideas are provided for the properties of such an excited "Higgs".
        Speaker: Dr Axel Maas (Friedrich Schiller University Jena (DE))
        Slides
      • 09:15
        Lattice hadron spectroscopy with the stochastic LapH algorithm 15m
        We present some preliminary results for single-particle and multi-particle states obtained on anisotropic, dynamical 2+1 lattices (24^3) generated by the Hadron Spectrum Collaboration. We use the Stochastic LapH algorithm to generate the all-to-all quark propagators.
        Speaker: Prof. Keisuke Juge (University of the Pacific (US))
        Slides
      • 09:30
        Precision calculation of the Standard Model \Delta S=2 contribution to indirect CP violation in K->\pi\pi decays 15m
        Indirect CP violation in K -> pipi decays plays a central role in constraining the flavor structure of the Standard Model and in the search for new physics. For many years the leading uncertainty in the SM prediction of this phenomenon was the one associated with the nonperturbative strong interaction dynamics in this process. I will present a fully nonperturbative lattice QCD calculation of the neutral kaon mixing parameter B_K, which quantifies the bulk of these effects. Our study involves 21 large-scale simulations with up and down quark masses all the way down to their very small physical value. It additionally involves nonperturbative renormalization. That allows us to gain full control over all sources of error and to determine B_K with an overall 1.1% uncertainty in the RI scheme at a scale 3.5 GeV, namely B_K^RI(3.5 GeV)=0.531(6)_stat(2)_sys. I will end the talk with a discussion of the phenomenological implications of our result.
        Speaker: Dr Thorsten Kurth (Bergische Universität Wuppertal (DE))
        Slides
      • 09:45
        |Vub| determination in Lattice QCD 15m
        At present there is a tension at the level of 3 \sigma between two exclusive determinations of |Vub|. They are obtained combining the experimental branching ratios of B -> \tau \nu and B -> \pi l \nu (respectively) with a theoretical computation of the hadronic matrix elements f_B and the B to \pi form factor f_+(q^2). To understand the tension, improved precision and a careful analysis of the systematics involved are necessary. We report the results of the ALPHA collaboration for f_B from the Lattice with N_f=2 O(a) improved Wilson fermions. We employ HQET, including 1/m_b corrections, with pion masses ranging down to ~250 MeV. Renormalization and matching were performed non-perturbatively, and three lattice spacings reaching a^-1~4.1 GeV are used in the continuum extrapolation. We also present progress towards a computation of f_+(q^2), to directly compare two independent exclusive determinations of |Vub| with each other and with inclusive determinations. Additionally, we report on preliminary results for f_Bs, which is needed to determine |Vtd| and |Vts|.
        Speaker: Dr Fabio Bernardoni (DESY (DE))
        Slides
      • 10:00
        B-physics from lattice QCD...with a twist 15m
        Present and future experiments will reach unprecedented precision in the measurements of physical quantities related to B-physics. Therefore an accurate theoretical determination of intrinsically non-perturbative parameters, relevant for studies of B-physics, is required in many phenomenological analyses to further constrain the Standard Model and to explore New Physics scenarios. The goal of lattice QCD calculations is to provide the required non-perturbative information with competitive statistical and systematic errors. Despite the intrinsic difficulties in simulating the non-perturbative dynamic of the b-quark with currently numerically affordable lattice spacings, B-physics quantities can nevertheless be calculated with high precision. I will present results for selected physical quantities obtained employing a well tested, though recently developed, method.
        Speaker: Dr Andrea Shindler (Humboldt University (DE))
        Slides
      • 10:15
        Tau decays at BaBar 15m
        We present a set of new results in tau-lepton physics using the full BABAR data set. This includes a new limit on the branching fraction of the isospin-forbidden, second-class-current decay tau --> pi eta'(958) nu_tau; a first study of high-multiplicity tau decays with charged kaons; and measurements of the branching fractions of 3- and 5-prong tau decays. Using the full BABAR dataset, we measure the branching fractions of the decays tau --> h (npi0) and h Ks Ks(pi0), where h indicates a charged kaon or pion and n may be up to 3. We also report the invariant-mass distributions of the decays tau -> pi pi pi nu, tau -> K pi pi nu, tau -> K K pi nu, and tau -> K K K nu, where events with Ks → pi+ pi- decays are excluded. We use these measurements to update the value of the magnitude of the CKM matrix element Vus. Within the standard model, tau-lepton decays conserve CP, so searches for CP violation in this system are sensitive to new physics. We report the results of a search for CP violation in the decay tau- --> pi - Ks nu using the full BABAR data set. In this mode a decay-rate asymmetry of (0.36 +/- 0.01)%. is expected within the standard model due to CP violation in the neutral kaon system. After accounting for effects due to the different interaction cross sections of K0 and anti-K0 mesons with the detector material, we find a decay-rate asymmetry of (-0.36 +/- 0.23 +/- 0.11)%, approximately 2.8 standard deviations from the standard model expectation.
        Speaker: Prof. Soeren Andre Prell (Iowa State University (US))
        Slides
      • 10:30
        Charm decays at Belle 15m
        We present new branching fraction measurements of rare radiative $D$ decays and compare these measurements with the theoretical predictions. The results are obtained from a large data sample collected near the $\Upsilon(4S)$ and $\Upsilon(5S)$ resonances with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider.
        Speaker: Prof. Min-Zu Wang (National Taiwan University (TW))
        Slides
      • 10:45
        Refreshment Break 15m
      • 11:00
        Charmless Two-body B decays Involving a Tensor Meson 15m
        We study two-body charmless hadronic $B$ decays involving a tensor meson in the final state within the framework of QCD factorization (QCDF). Unlike the light vector meson, because of the G-parity of the tensor meson, both the chiral-even and chiral-odd two-parton light-cone distribution amplitudes of the tensor meson are antisymmetric under the interchange of momentum fractions of the quark and antiquark in the SU(3) limit. The factorizable amplitude with a tensor meson emitted vanishes under the factorization hypothesis owing to the fact that a tensor meson cannot be created from the local $V-A$ and tensor currents. As a result, $B^-\to \bar K_2^{*0}\pi^-$ and $\overline B^0\to K_2^{*-}\pi^+$ vanish in naive factorization. The experimental observation of the former implies the importance of nonfactorizable effects. For penguin-dominated $B\to TP$ and $TV$ decays, the predicted rates in naive factorization are normally too small by one to two orders of magnitude. In QCDF, they are enhanced by the power corrections from penguin annihilation and nonfactorizable contributions. The experimental observation that $f_T/f_L\ll 1$ for $B\to \phi K_2^*(1430)$, whereas $f_T/f_L\sim 1$ for $B\to \omega K_2^*(1430)$, can be accommodated in QCDF. More interesting results will be presented in the talk. H.Y. Cheng and K.C. Yang, ``Charmless Hadronic B Decays into a Tensor Meson", Phys. Rev. D 83, 034001 (2011).
        Speaker: Prof. Kwei-Chou Yang (Chung Yuan Christian University (TW))
        Slides
      • 11:15
        Studies of multibody charmless B decays at LHCb 15m
        Charmless multibody B decays proceeding through the quark transitions b -> q qbar s(d) are relevant laboratories to study both direct and mixing-induced CP violation effects and to search for deviations from Standard Model expectations. The 1.0 fb−1 of data recorded by the LHCb experiment in 2011 have been analyzed to reconstruct B+, B0 and B0s decays in various multibody final states. We report direct CP-violation studies in three-body charged B decays, reconstruction of neutral B mesons in three-body decays with a K0S meson in the final state and amplitude analyses of B decays into two intermediate vector particles such as B0 -> φ K∗0 or B0s -> φ φ.
        Speaker: Dr Fernando Luiz Ferreira Rodrigues (CBPF - Brazilian Center for Physics Research (BR))
        Slides
      • 11:30
        Hadronic B decays at BaBar 15m
        Baryonic decays account for about 7% of the B-meson width, but are far less studied than decays into meson-only final states. We present new studies of the processes B- --> Sigma_c++ pbar pi- pi- and B0bar --> Lambda_c+ pbar p pbar. The former decay is a resonant subchannel of the 5-body decay B- --> Lambda_c+ pi+ pbar pi- pi-, which is the known baryonic decay mode with the largest branching fraction, which motivates more detailed studies into its substructure. Similarly, the latter decay has the same quark content as the high-branching-fraction modes B0bar --> Lambda_c+ pbar pi+ pi- and B- --> Lambda_c+ pi+ pbar pi- pi-, shedding further light on baryon production. In addition to measuring the overall branching fractions, we analyze the resonant substructure of these decays. Decays of B mesons into two charm mesons and a kaon proceed through a number of interfering intermediate states, making them particularly useful for studying charm-strange mesons and ccbar resonances above the open-charm threshold. We present new studies of these decays based on the full BABAR Upsilon(4S) dataset. We measure the total branching fractions and perform a Dalitz-plot analysis, from which we obtain the properties of intermediate resonances. Using the full BABAR Upsilon(4S) dataset, we perform amplitude analyses of the decays B+ --> K+K-K+ and B+ --> Ks Ks K+ and measure CP-violating asymmetries and partial branching fractions. For B+ --> K+K-K+, we find a direct CP asymmetry in B+ --> phi(1020)K+ of (12.8 +/- 4.4 +/- 1.3)%, which differs from zero by 2.8 sigma. The standard model predicts no appreciable asymmetry for this mode. We also perform an angular-moment analysis of these channels. This high-statistics analysis allows us to determine that the f_X(1500) state, which has been used in previous B--> KKK fits, is not needed, and that the data can be adequately described by the sum of the resonances f_0(1500), f_2'(1525), and f_0(1710).
        Speaker: Dr Torsten Leddig (Universität Rostock (DE))
        Slides
      • 11:45
        Hadronic B decays at Belle 15m
        The measurement of $B^0 \to \pi^0 \pi^0$ plays a vital role in the extraction of the UT angle $\phi_2 = arg[-V_{td} V_{tb}^*/V_{ud} V_{ub}^* ]$ from time-dependent CP analyses of the $B\to \pi\pi$ decays. This process is also expected to exhibit direct CP violation, a measurement of which would place additional constraints on $\phi_2$. Furthermore, an improved analysis of $B^0 \to \pi^0 \pi^0$ would help resolve the significant disagreement in the Belle and BaBar measurements of this mode. We present a new measurement of this mode using the full data set of $772 \times 10^6$ $B\bar{B}$ pairs collected by the Belle experiment at the KEKB asymmetric-energy $e^+ e^−$ collider. We present improved measurements of the branching fraction, $CP$ asymmetry and longitudinal polarization fraction for the $B^+ \to \rho^+ \rho^0$ decay based on a data sample corresponding to $772 \times 10^6$ $B\bar{B}$ pairs, collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^−$ collider. We report the results of a search for the $B^+ \to K^{*+} \overline{K}{}^{*0}$ decay based on a data sample of $772 \times 10^6$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^−$ collider. Decays of $B$ mesons to the final states with an even number of kaons, such as $B^0 \to K^+ K^- \pi^0$, are suppressed within the Standard Model (SM). Therefore, they provide a unique probe to test the SM predictions. We present a first search of this decay using the full data set of $772 \times 10^6$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^−$ collider. We search for $B\to K^+ K^-$ decay based on the fulll data sample of $772 \times 10^6$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^−$ collider.
        Speaker: Ms T'Mir Julius (University of Melbourne (AU))
        Slides
      • 12:00
        Y(5S) spectroscopy at Belle 15m
        We report the results of the $R_b$ scan in the region from 10750 MeV to 11020 MeV in steps of 5 MeV. The scan data were collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. This result can be used to map the shape of the $\Upsilon(10860)$ and $\Upsilon(11020)$ resonances. The search for the tetraquark candidate $Y(10900)$ is also reported. We report on the study of the hadronic transitions from the $\Upsilon(5S)$ to lower bottomonia using 121.4 fb$^{-1}$ data collected at the $\Upsilon(5S)$ resonance by the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. Decays of the $\Upsilon(5S)$ to the $\Upsilon(1D)\pi^+\pi^-$ and $\Upsilon(1,2S)\eta$ final states have been observed for the first time. Recently, Belle observed the spin-singlet bottomonium states $h_b(1P)$ and $h_b(2P)$. Radiative transitions to the $\eta_b(1S)$ and $\eta_b(2S)$ are expected to account for a large fraction of the $h_b(nP)$ decays. We report on the measurement of the $\eta_b(1S)$ and $\eta_b(2S)$ parameters using these radiative transitions. We report the most precise measurement of the $\eta_b(1S)$ mass, first measurement of its width, first measurement of the $\eta_b(2S)$ mass, and first measurement of the branching fractions of the radiative transitions $h_b(nP)\rightarrow\eta_b(mS)\gamma$. Recently, Belle observed two exotic resonances $Z_b(10510)$ and $Z_b(10560)$ produced in the $\Upsilon(5S)\rightarrow Z_b^+\pi^-$ transitions and decaying into the $\Upsilon(1S)\pi^+$, $\Upsilon(2S)\pi^+$, $\Upsilon(3S)\pi^+$, $h_b(1P)\pi^+$ and $h_b(2P)\pi^+$ final states. We report on further studies of these resonances.
        Speaker: Prof. Alexander Bondar (Novosibirsk State University (RU))
        Slides
      • 12:15
        Studies of hadronic B decays to final states containing open charm mesons at LHCb 15m
        The LHCb experiment is a general purpose forward spectrometer operating at the Large Hadron Collider, optimized for the study of B and D hadrons. LHCb collected 1.0 fb-1 of integrated luminosity during 2011 data taking, collecting unprecedented large samples of B hadron decays to final states involving charmed hadrons. These decays offer many complementary measurements of CP violation and CKM matrix parameters, and serve as a laboratory for testing effective theories of hadron decays. We present a selection of new world leading results in these types of decays, including first observations of new decay modes, world best branching ratio measurements and studies of resonant structure.
        Speaker: Ms Alexandra Martin Sanchez (Universite de Paris-Sud 11 (FR))
        Slides
      • 12:30
        Bs decays at Belle 15m
        We study the decays $B^0_s\rightarrow J/\psi\phi$ and $B^0_s\rightarrow J/\psi K^+K^-$ using a 121.4 fb$^{-1}$ data sample collected at the $\Upsilon(5S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The decay $B^0_s\rightarrow J/\psi\phi$ is an important mode for measuring the CP violating phase $\beta_s$ in the $B_s\bar{B}_s$ mixing, which is of particular interest as it is sensitive to physics beyond the Standard Model. Therefore, regarding the current PDG value with a relative error of 36%, a precise measurement of this branching fraction is essential. Furthermore, in this analysis the branching fraction of the decay $B^0_s\rightarrow J/\psi K^+K^-$, which has not been measured so far, is determined simultaneously with the branching fraction of the $B^0_s\rightarrow J/\psi\phi$. By separating these two final states, it is also possible to calculate the $S$-wave contribution within the $\phi$ mass region.
        Speaker: Ms Felicitas Thorne (Institute of High Energy Physics (AT))
        Slides
      • 12:45
        B meson decays to final states containing charmonia at LHCb 15m
        The LHCb experiment is a forward arm spectrometer designed to make high precision measurements of b hadron decays at the LHC. During 2011 a total luminosity of 1.0 fb-1 of data was collected at sqrt(s)=7 TeV. LHCb's efficient dimuon trigger allows to perform studies of B mesons decaying to charmonia with high precision. We will present new measurements of the relative branching ratios of exclusive b decays to final states involving J/psi and psi(2S) mesons, together with other studies of B-decays into J/psi and light hadrons. In addition, we will discuss results for exotic states such as the X(3872) and X(4140) .
        Speaker: Mr Christian Peter Linn (Ruprecht-Karls-Universitaet Heidelberg (DE))
        Slides
      • 13:00
        Lunch Break 45m
      • 13:45
        Updated measurements of the B0s and Lambda_b lifetimes 15m
        Updated measurements of the lifetimes of the Lambda_b and of the B0s are obtained using the full data sample collected with the D0 detector in Run II of the Tevatron collider. For the B0s the lifetime measurement is obtained from a study of a sample of semileptonic decays, B0s--->Ds+mu+X, while in the case of the Lambda_b the fully reconstructed decay Lambda_b-->J/psi+Lambda0 is used.
        Speaker: Prof. Peter Ratoff (Lancaster University (UK))
        Slides
      • 14:00
        Measurements of b hadron lifetimes and effective lifetimes at LHCb 15m
        Precision measurements of b-hadron lifetimes are a key goal of the LHCb experiment. In the B0s sector, the measurement of the effective lifetimes for B0s mesons decaying to CP-odd, CP-even and flavour specific final states are essential for constraining the B0s mixing parameters, ΔΓs, the average width Γs and the CP-violating phase, φs. We present measurements of the effective lifetimes of B0s -> K+ K–, B0s -> J/ψ f0(980) and B0s -> J/ψ φ using 1.0 fb–1 of data collected by LHCb in 2011.
        Speaker: Dr Anna Phan (Syracuse University (US))
        Diapositivas
      • 14:15
        Flavour tagging at LHCb and measurements of B meson oscillations 15m
        The identification of the flavour of reconstructed B0 and B0s mesons at production is necessary for the measurements of oscillations and time-dependent CP asymmetries. We report on the techniques developed by the LHCb experiment for flavor tagging and on the procedures used to optimize and calibrate its performance using data samples of different flavour-specific B decays. We also describe the latest results on B meson oscillations obtained using flavour tagging, including the updated determination of the B0 and B0s mixing frequencies Δmd and Δms.
        Speaker: Dr Stefania Vecchi (INFN Ferrara)
        Slides
      • 14:30
        Mixing-induced CP violation at BaBar 15m
        While CP violation in the B-meson system has been well established by the B factories, there has been no direct observation of time-reversal violation in this system. Using 468 million B-Bbar pairs collected by the BABAR detector at SLAC, we measure T-violating parameters in the time evolution of neutral-B mesons by comparing the probabilities of B0 or anti-B0 transforming into definite CP final states and vice versa. The results lead to the first direct observation of Time Reversal non-invariance, independent of CP violation. We present a new measurement of the time-dependent CP-asymmetry parameters S and C in the decay B0 --> D*D* decays using 467 million B-Bbar pairs collected with the BABAR detector at SLAC. The analysis makes use of the technique of partial reconstruction, resulting in high reconstruction efficiency and high statistics. From S and C we extract the CP-even components S_+ and C_+. Comparison of S_+ to the standard-model prediction based on measurements from b-->c cbar s decays constitutes a test for the presence of new physics contributions in this decay. We present a measurement of the mixing-induced CP asymmetry for B0 mesons. Semileptonic B0-->D*lnu decays are selected with a partial reconstruction technique that allows for high selection efficiency and high statistics with precise determination of the background. The resulting precision is comparable with the measurements based on di-lepton tags performed at the B-factories. B decays that proceed via penguin amplitudes are sensitive to new-physics contributions. Measurements of time-dependent CP violation in such decays have yielded results that were not fully consistent with those from the more precise b--> c cbar s decays. This warrants further studies with all possible decay modes, requiring in particular use of decays with multibody final states. We report updated time-dependent CP violation and Dalitz-plot analyses of the decays B0 --> Ks Ks Ks and B0-->K+K- Ks. The high Ks multiplicity in the first mode essentially precludes its study at the LHC at this time. We report the total branching fractions, contributions of intermediate resonances, and CP violation parameters. We report the first evidence for CP violation in B0 --> Ks Ks Ks, with CP conservation excluded at 3.8 standard deviations.
        Speaker: Dr Riccardo de Sangro (INFN Frascati (IT))
        Slides
      • 14:45
        Indirect CP violation at Belle 15m
        We present a precise measurement of time-dependent CP violation in the neutral $B$ decays into charmonium and $K^0$ with a large data sample containing 772 million $B\overline{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider.
        Speaker: Mr Bastian Kronenbitter (KIT)
        Slides
      • 15:00
        Studies of asymmetries in semileptonic B decays at LHCb 15m
        During 2011 data taking, LHCb has recorded large samples of semileptonic B decays. These provide potential to study CP violation effects in all of the D0, B0 and B0s systems. For the former, the charge of the muon in B -> D0 μ ν X decays provides a novel procedure to tag the flavour of the neutral D meson at production, allowing competitive sensitivity for the measurement of the difference of CP violation asymmetries in D0 -> h+ h- (h= K,π). For the latter, integrated or time-dependent asymmetries between charge-conjugate final states probe CP violation in B0(s) mixing through the measurement of the parameter Afs (sometimes referred to as Asl). All of these measurements rely on data-driven techniques to obtain excellent control of systematic uncertainties. We present the status of the analyses.
        Speaker: Prof. Marina Artuso (Syracuse University (US))
        Slides
      • 15:15
        CDF results on CP violation in hadronic B decays 15m
        Using the complete 10/fb dataset, the CDF experiment has studied CP violation in several hadronic decay modes of bottom hadrons. In the decays of Bd, Bs, and Lambda_b hadrons into charmless two-body final states, we present results including improved measurements of the branching ratios and time-integrated CP-violating asymmetries of known decays and tightened constraints on these quantities for the as yet unobserved modes. In flavor-tagged Bs --> JpsiPhi decays, we have measured the Bs mixing phase, lifetime, and width-difference. We also present world's best results on the Bs-->JpsiPhi and DsDs branching fractions.
        Speaker: Mr Mirco Dorigo (INFN Trieste & University of Trieste (IT))
        Slides
      • 15:30
        Measurements of flavor specific mixing asymmetries in B0d and B0s mesons and of the like-sign dimuon charge asymmetry 15m
        We present measurements of the flavor-specific semileptonic asymmetry for B0d and B0s mesons using the full Run II data sample collected with the D0 detector at the Fermilab Tevatron collider. Three different decay channels are analysed: B0-->mu+D+X, with D-->Kpipi, B0-->mu+D*+X with D*-->D0pi, D0-->Kpi, and B0s-->Ds+mu+X, with Ds-->phipi, phi-->KK. We extract the charge asymmetries as a function of the proper decay length in the case of the B0 mesons, while in the case of the B0s mesons the time integrated asymmetries are obtained. Detector related asymmetries are corrected for using data driven methods and corrections are applied using Monte Carlo simulations for the contributions from charge symmetric processes. Results with a precision comparable to the current world average are obtained and compared to the measurements obtained from the study of the dependence of the like-sign dimuon charge asymmetry as a function of the muon impact parameter.
        Speaker: Dr Iain Bertram (Lancaster University)
        Slides
      • 15:45
        Refreshment Break 15m
      • 16:00
        Determination of DeltaGamma and phi_s from the decay Bs to J/psi Phi in ATLAS 15m
        A large sample (20 k) of Bs -> J/psi Phi decays were collected by ATLAS in year 2011. The transition to states with defined CP eigenvalues have been studied through angular correlations in decays of J/psi and Phi.  Measurement of the lifetimes of the different eigenstates and the CP-violating mixing phase phi_s have been recently obtained and are presented.
        Speaker: Dr Sandro Palestini (CERN (CH))
        Slides
      • 16:15
        Measurement of φs at LHCb 15m
        The determination of the CP-violating phase φs in B0s -> J/ψ φ decays is one of the key goals of the LHCb experiment. Its value is predicted to be very small in the Standard Model but can be significantly enhanced in many models of new physics. We present the world's best measurement of φs and the first observation of a non-zero ΔΓs based upon 1.0 fb–1 of data collected at LHCb during 2011. φs can also be measured using the B0s -> J/ψ π π decay mode, which has been shown to be predominantly CP-odd. We present this measurement and the combination of φs from both decay modes.
        Speaker: Dr Greig Cowan (EPFL (CH))
        Slides
      • 16:30
        Searches for CP violation in the B0s system using B0s-->J/psi+(phi/f0/f2) decays 15m
        We report updated measurement of the CP-violating phase phi_s and of the decay width differences for the two mass eigenstates DeltaGamma_s from the flavor-tagged decay B0s-->J/psi+phi. We also present measurements of the branching ratios for the decays B0s-->J/psi+f0 and B0s-->J/psi+f2, a study of the angular distribution for the latter decay and improve the determination of the CP violation parameters using the B0s-->J/psi+f0 decay.
        Speaker: Dr Dmitri Tsybychev (Stony Brook University (US))
        Slides
      • 17:00
        Measurements of B -> D K(*) decays to constrain the CKM unitarity triangle angle γ at LHCb 15m
        The LHCb experiment is a general purpose forward spectrometer operating at the Large Hadron Collider, optimized for the study of B and D hadrons. LHCb collected 1.0 fb-1 of integrated luminosity during 2011 data taking, collecting unprecedented large samples of B hadron decays to final states involving charmed hadrons. These decays offer many complementary measurements of CP violation, in particular measurements which are sensitive to the angle γ of the CKM unitarity triangle. We present here world best measurements of these decays.
        Speaker: Dr Andrew Stephen Powell (University of Oxford (GB))
        Slides
      • 17:15
        Charmless B decays and CP violation at BABAR 15m
        We report a measurement of CP violation in the decay B0 --> pi+ pi- pi0 using the full Upsilon(4S) sample of the BABAR experiment. We perform a full time-dependent Dalitz-plot analysis sensitivity to the interference between B0 and B0bar decays, as well as between the intermediate rho --> pi pi resonances. This allows us to extract the CKM unitarity-triangle angle alpha with reduced ambiguity and improved precision. Precise measurement of alpha serves to test the standard model and constrain new physics in B0-B0bar mixing. We search for decays of the B0 meson to the final states omega omega and omega phi. These flavor-changing-neutral-current decays are sensitive to physics beyond the standard model and thus provide constraints on potential new-physics effects. They may also shed light on the unexpectedly low longitudinal-polarization fraction in the SU(3)-related decay B-->K* phi. We report studies of B-meson decays to the K* rho and K*f0 final states, where the K* and rho may be charged or neutral. We distinguish between the vector K*(892), the tensor K*_2(1430), and the resonant and nonresonant scalar components. We report first observation or first evidence for some of the modes and analyze the polarization of the vector-vector and vector-tensor components for the observed signals.
        Speaker: Dr Eli Ben Haim (LPNHE, IN2P3-CNRS, Universities of Paris VI (FR))
        Slides
      • 17:30
        Measurements of CP violation in charmless two-body B decays at LHCb 15m
        Direct and mixing-induced CP violation observables in charmless charged two-body B decays may provide valuable information in the quest for physics beyond the Standard Model. Owing to the large beauty production cross-section at the LHC and to the unique characteristics of the LHCb detector and trigger, unprecedented samples of such decays are becoming available. We present updated measurements of direct CP violation in B0(s) -> K π decays as well as of direct and mixing-induced CP violation in B0 -> π+ π– and B0s → K+ K− decays. Furthermore, we report measurements of the branching fractions of these decays, notably including those of the annihilation modes B0 -> K+ K− and B0s -> π+ π− .
        Speaker: Dr Paul Soler Jermyn (University of Glasgow (GB))
        Slides
      • 17:45
        Constraining CP violation in neutral meson mixing with theory input 15m
        There has been a lot of recent interest in experimental hints of CP violation in B_{d,s}^0 mixing. The D0 measurement of the semileptonic CP asymmetry would - with higher significance - be a clear signal of beyond the standard model physics. In this talk I present a relation [arXiv:1203.3545] for the mixing parameters, which allows clearer interpretation of the data in models in which new physics enters in M_{12} and/or \Gamma_{12}. This result implies that the central value of the D0 measurement in B_{d,s}^0 decay is not only in conflict with the standard model, but in a stronger tension with data on \Delta\Gamma_s than previously appreciated. After I derive the relation between the theoretical prediction of |\Gamma_{12}| and the measurements of \Delta M, \Delta \Gamma and A_{\rm SL}, I will explain how this result can help to better constrain \Delta\Gamma or A_{SL}, whichever is less precisely measured.
        Speaker: Dr Sascha Turczyk (Lawrence Berkeley National Laboratory (US))
        Slides
    • 14:00 18:00
      AsiaHEP Meeting Room 209

      Room 209

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
    • 18:00 19:00
      Poster Session
      • 18:00
        Antineutrino Detector for On-Line Monitoring of Nuclear Reactor Parameters and search for short range neutrino oscillations 1h
        A solid scintillator detector DANSS (Detector of Anti-Neutrino based on Solid Scintillator) designed for remote on-line diagnostics of nuclear reactor parameters and a search for short range neutrino oscillation is under construction now. It will be installed at the Kalinin Nuclear Power Plant next year. DANSS is a 1 m3 plastic scintillator detector divided into 2500 cells and surrounded with combined passive and active shielding to suppress external radiation backgrounds. The basic element of the detector is the scintillator strip 4×1×100 cm3 in size with thin gadolinium coating. Light from the strip is collected by wave length shifting fibers 1.2 mm in diameter and transported to small-size photomultipliers and multipixel photodiodes operated in the Geiger mode (SiPMs) used to read out scintillation signals. The estimates of the DANSS parameters are presented: efficiency (~70%), counting rate of neutrino events (~8500 per day), and expected background level (below 1%). We demonstrate that a detector with such properties is capable to measure the nuclear reactor thermal power with an accuracy of about 1.3% in one day and to determine the fuel composition and 239Pu production with an accuracy of ~ 4%. In addition, the antineutrino detector allows monitoring the 239Pu-enriched rod extraction procedure. DANSS is placed on a movable platform. It can change the distance from the detector to the reactor core from 12 to 17 meters. The detector can be also placed at larger distances from the reactor core but this requires reassembling of the detector in a different hall. Measurements of the neutrino flux and energy spectrum at different distances should allow to study a large fraction of a sterile neutrino parameter space indicated by recent experiments and reanalysis of the reactor neutrino fluxes.
        Speaker: Prof. Mikhail Danilov (Institute for Theoretical and Experimental Physics (RU))
      • 18:00
        Automatic Lagrangian Generation 1h
        In particle physics, after specifying the symmetries of a theory, the field content and their transformations under the symmetries, the resulting procedure for obtaining physical results is well-defined and algorithmic. This talk presents a program that permits the user to simply specify the relevant content and automatically generate a Lagrangian.
        Speaker: Dr Nicholas Setzer (Universidad de Granada (ES))
        Poster
      • 18:00
        B to Kstar and Bs to phi form factors at low recoil from lattice QCD 1h
        We present our calculation of B to Kstar and Bs to phi form factors (and those for B to rho and Bs to Kstar). These are obtained from lattice QCD calculations which include the effects of up, down, and strange sea quarks and use the nonrelativistic formulation for the bottom quark. Results are obtained directly in the low recoil (large q-squared) kinematic range, complementing results obtained using light-cone sum rules. The ability to determine these form factors accurately is a key ingredient in searches for and constraints on the types of BSM physics which can contribute to rare B decays.
        Speaker: Dr Matthew Wingate (University of Cambridge (UK))
      • 18:00
        Boost-invariant Leptonic Observables and Reconstruction of Parent Particle Mass 1h
        We propose a class of observables constructed from lepton energy distribution, which are independent of the velocity of the parent particle if it is scalar or unpolarized. These observables may be used to measure properties of various particles in the LHC experiments. We demonstrate their usage in a determination of the Higgs boson mass.
        Speaker: Dr Yasuhiro Shimizu (Tohoku Univ. (JP))
      • 18:00
        Dark Energy Field Evolution and Masses of Objects formed by the Gravitational Collapse of Dark Energy Field Configurations 1h
        Dark Energy is the dominant component of the Energy Density of the Universe. It is imperative to understand the gravitational dynamics of Dark Energy and its implications. The most promising candidate for dark energy is the energy density of fields in curved space-time. We describe the formalism to study the time evolution and gravitational dynamics of dark energy field configurations given any general potential for the dark energy fields. We apply this formalism to models of dark energy motivated by particle physics considerations. We explicitly study the time evolution of the energy density of the fields in addition to studying the dynamics of the fields themselves. The study of the gravitational dynamics allowed us to demonstrate the gravitational collapse of dark energy field configurations. The study of the time evolution of the energy density allows us to compute the masses of objects formed by the gravitational collapse of dark energy field configurations. We will report on the masses of objects formed by the gravitational collapse of dark energy field configurations.
        Speaker: Anupam Singh (L.N.Mittal I.I.T. (IN))
      • 18:00
        Development of very low threshold detection system for low-background experiments 1h
        A concept of readout of noble gas two-phase emission detectors by means of multipixel avalanche Geiger photodiodes (MGPDs or SiPMs) and a THGEM structure is presented. It is well known that a two-phase emission technique with noble gases is a very sensitive method of detection of very small ionisation signals (down to few or single ionisation electrons). Electroluminescent “amplification” provides the unique possibility to detect reliably even the single ionisation electron extracted from the liquid to the gas phase. Due to this reason such detectors are currently successfully used in the Dark Matter search experiments and are considered for the use in the neutrino experiments: for coherent scattering of reactor antineutrino off atomic nuclei. To increase the capabilities of a two-phase detector a system of THGEM + WLS (wavelength shifter) +MGPD is used for its readout. Additional amplification of the charge in the THGEM holes gives the large light signal of electroluminescence detected with an array of SiPMs. This readout system provides the mm accuracy for even very low-energy events, that is important for the reliable separation of the rare physical events from the background ones caused by spontaneous emission of the electrons from the liquid noble gas surface. The results of analysis experimental data and comparison MC simulations are present.
        Speaker: Dr Ivan Alexandrov (ITEP (RU))
        Poster
      • 18:00
        Electroweak corrections for W/Z+ n jet production 1h
        In the era of the LHC experiments the analysis of vector boson together with n jet production becomes very important. On the one hand these processes serve as a testing environment for perturbative QCD calculations as well as detector understanding. On the other hand, W/Z+n jet production is used for new physics searches and thus one has to deal with a huge amount of irreducible Standard Model background. Therefore we need to understand these processes thoroughly. With the increasing center of mass energy s, electroweak corrections become more important. Especially Sudakov type logarithms of the form \alpha_{ew} \ln^2[ M_{W/Z}^2/s] can appear and potentially become large in the differential cross section. These logarithms stem from infrared and collinear divergences for M\rightarrow 0, as e.g. in QCD and QED processes involving a real gluon or photon emission, regularized by the finite gauge boson mass. I will review the general methods presented in [1-3] and extend them to re-sum the electroweak and QCD logarithms of W/Z+1(2) jet production explicitly as well as discuss the necessary input to generalize the computation to n jets. The starting point for this analysis is the unbroken full Standard Model, which is matched onto a SCET like theory SCET_EW to describe all particles as collinear fields. At M\sim 100-200 GeV the electroweak symmetry is broken and SCET_EW is consequently matched onto SCET_\gamma, in which the heavy gauge bosons as well as the top quark are integrated out and remain as static fields. This approach allows to compute the anomalous dimension for the running between the high and low scale as well as low scale matching systematically for each process. The soft degrees of freedom can interact between different particles and depend on the gauge quantum numbers, only. The collinear degrees of freedom instead do not interact with each other - which actually depends on the regulator choice - and thus depend only on the type of the particle. Therefore we obtain both soft and collinear corrections. In turn we are able to re-sum the logarithms between the high scale at the center of mass energy and the low scale at which the symmetry is broken using the anomalous dimension and additionally obtain the low scale matching corrections at the same time. This correction can be computed analytically as the Wilson coefficient matrix for the operator basis at the low scale up to NLL precision. I outline the automizable (numerical) calculation as well as necessary input for a general process. Then I will discuss the specific W/Z+1(2) jet production and changes to several observables due to this corrections, especially I will mention the importance for distinguished analysis. The possible generalization to more final state vector bosons and jets is discussed. In the end I present an approach to implement these corrections into automatic Monte Carlo generators, at the example of the framework Geneva. [1] J.~-y.~Chiu, F.~Golf, R.~Kelley and A.~V.~Manohar, Phys.\ Rev.\ Lett.\ {\bf 100} (2008) 021802 [2] J.~-y.~Chiu, F.~Golf, R.~Kelley and A.~V.~Manohar, Phys.\ Rev.\ D {\bf 77} (2008) 053004 [3] J.~-y.~Chiu, A.~Fuhrer, R.~Kelley and A.~V.~Manohar, Phys.\ Rev.\ D {\bf 81} (2010) 014023
        Speaker: Dr Sascha Turczyk (LBNL (US))
        Slides
      • 18:00
        Electroweak corrections to vector-boson + jet production at the LHC 1h
        A review of the recent progress in the theory predictions for vector-boson plus jet(s) production at the LHC is given, focussing on the discussion of electroweak corrections, where all off-shell effects due to the vector-boson decay are included consistently. The electroweak contributions amount up to several tens of percent at high transverse momenta and thus significantly affect the V+jet production rates. We present new results on the electroweak corrections to single-jet production with missing transverse momentum in the Standard Model, since the corresponding monojet signature is predicted by many new-physics models and therefore needs a reliable SM prediction. In order to further improve the theory prediction for the V+jet cross section, we additionally discuss the correct combination of EW corrections with "standard" QCD Monte Carlo simulations, which is an important issue in view of the high experimental accuracy expected in the future of LHC physics.
        Speaker: Dr Tobias Kasprzik (KIT (DE))
      • 18:00
        Evidence for a pion condensate formation in pp interactions at U-70 1h
        Experiments at LHC give evidence of similarity of multiple production mechanisms in proton interactions at high multiplicities [1] and central collisions of relativistic heavy ions (RHIC). Studies at high multiplicity (more than mean value) region are carried out at U-70 accelerator at IHEP (Protvino). They are aimed at the search for collective phenomena. It is known that mainly pions are produced at U-70 energies. Their mean energy decreases with multiplicity increase. In that system Bose-Einstein condensate (BEC) [2] can be formed. The theoretical and experimental studies of BEC are continuing from 70es. M. Gorenstein and V. Begun [3] have shown within the framework of an ideal pion gas model that sharp growth of the neutral pion number fluctuations will be a signal of BEC formation with the increase of total multiplicity (a sum of neutral and charged particles). They proposed to measure scaled variance, ω. It is defined as the ratio of variance of neutral pion number distribution to mean multiplicity. In the thermodynamic limit ω approaches to infinity. This value reached the finite quantity for the restricted system formed in the collisions of two protons. SVD Collaboration (JINR, IHEP and SINP MSU) [4] investigated neutral pion number fluctuations in pp interactions at 50 GeV/c incident beam at U-70 versus total multiplicity and has revealed noticeable growth of ω with the total multiplicity increase. This work was carried out in two stages. At the first stage the charged-particle multiplicity distribution was measured. At the second stage the neutral pion number distributions were restored. We could go down three orders on topological cross sections up to ~ 10 nb. Events with high multiplicity are extremely rare therefore we have designed a sophisticated trigger to suppress the recording of events with the multiplicity smaller than the given value, called a trigger level. The measured topological cross sections have been corrected with taking into account trigger conditions, a detector acceptance, the detection efficiency of setup and the reconstruction algorithm. The measurements have been fulfilled with the silicon vertex detector.
        Speaker: Dr Elena Kokoulina (Joint Institute for Nuclear Research (RU))
        Poster
      • 18:00
        Finding Stop with Azimuthal angle in 2jet+MET at the LHC 1h
        Suppressing the bunch of top quark background is essential in finding the top squark at the LHC. Currently we are not optimized in the discrimination of them. We suggest the azimuthal angle around the beam axis be a good discriminator and show its utility in the dijet+Missing Energy channel at the LHC with 14 TeV center of energy.
        Speaker: Dr Doyoun Kim (Monash University (AU))
      • 18:00
        Forward Calorimeters Test Beam Results for Future Linear Colliders 1h
        In detectors at Future Linear Colliders a Beam Calorimeter (BeamCal) is foreseen. The main BeamCal goals are coverage of low polar angles for new physics searches and beam tuning. The challenges are radiation hardness of sensors due to a large amount of beamstrahlung remnants, fast readout, fine granularity and compactness. A prototype of a BeamCal sensor made of GaAs with pad structures was assembled and successfully tested in the laboratory and on the 4,5 GeV electron beam(DESY II, Hamburg). Two test beams results are present 2010-2011. The sensor was connected to a fan-out, and specially developed front-end ASICs and flash ADC. Multichannel read out was shown working with recently developed DAQ. Results are obtained for signal-to-noise and the response as a function of the position on and between the pads. In addition, results of the sensor characterization are presented: the leakage current measured as a function of temperature and the charge collection efficiency as a function of the operation voltage.
        Speaker: Ms Olga Novgorodova (DESY (DE))
        Slides
      • 18:00
        Galactic Dark Matter in the Phantom Dark Energy Background 1h
        We study the possibility that the galactic dark matter exists in the phantom field responsible for the dark energy. The statically and spherically exact solution for this kind of the galaxy system with a supermassive black hole at its center is obtained. The solution of the metric functions is satisfied with $g_{tt} = - g_{rr}^{-1}$. In a galaxy, the background of the phantom field, which is spatially inhomogeneous, has an exponential potential. The absorption cross section of the low-energy $S$-wave excitations, arising from the phantom dark energy background, into the central black hole is shown to be the horizontal area of the central black hole. The accretion of the phantom energy is companied with the decrease of the black hole mass, which is estimated to be much less than a solar mass in the lifetime of the Universe. Using a simple model with the cold dark matters very weakly coupled to the excited phantom particles, we show that these two densities can be stable in the galaxy. M.H. Li and K.C. Yang, ``Galactic Dark Matter in the Phantom Field'', ArXiv:1204.3178 [astro-ph.CO].
        Speaker: Mr Ming-Hsun Li (Chung Yuan Christian University (TW))
        Poster
      • 18:00
        Global fits of the unitarity triangle and search for new physics in pseudoscalar-pseudoscalar final states 1h
        We have updated our unitary triangle fitting program based on the scan method\footnote{Global fits of the CKM matrix. G. Eigen, G.P. Dubois-Felsmann, D.G. Hitlin, F.C. Porter. Eur.Phys.J. C33 (2004) S644, e-Print: hep-ex/0312062.} to constrain the $\bar{\rho}- \bar{\eta}$ plane using the standard input measurements (CKM matrix elements, $\sin 2 \beta$, $B^0_{d(s)}$ mixing, and $\epsilon_K$) as well as branching fraction and $C\!P$ asymmetry measurements of $B$ decays to all light pseudoscalar-pseudoscalar, pseudoscalar-vector, vector-vector, and $a_1$ pseudoscalar mesons to determine $\alpha$, $D^{(*)} K^{(*)}$ mode to determine $\gamma$, and $D^{(*)} \pi$ and $D\rho$ decays to determine $2 \beta+\gamma$. We parameterize the individual decay amplitudes in terms of color-allowed tree, color-suppressed tree, penguin, singlet penguin, electroweak penguin, as well as the $W$-exchange and $W$-annihilation amplitudes. With this parameterization, we obtain a good fit to the measured branching fractions and $C\!P$ asymmetries of all $B$ decays to pseudoscalar-pseudoscalar mesons without any New Physics contributions. This simultaneous fit allows us to determine the correlation between $\alpha$ and $\beta$.
        Speaker: Prof. Eigen Gerald (University of Bergen (NO))
        Slides
      • 18:00
        Heavy QQ(bar) "Fireball" Annihilation to Multi-Vector Bosons 1h
        Drawing an analogy of replacing the nucleon by heavy (chiral) quark Q, the pion by longitudinal weak boson (i.e. Goldstone boson G), and the pi-N-N coupling by G-Q-Q Yukawa coupling, we construct a statistical model for annihilation of QQ(bar) into multi-Goldstone bosons, i.e. n longitudinal weak bosons. This analogy is becoming prescient since the LHC direct bound on heavy chiral quark (the 4th generation!) masses has reached above 600 GeV, hence entered the regime of perturbative unitarity violation, or strong coupling, much like the case for pion-nucleon coupling. Taking MQ ~ TeV, the mean number of produced Goldstone bosons is of order 10 or more, with two or three boson production occupying only a very tiny fraction, hence would affect search strategy. This "fireball" process is controlled by a temperature of order $v$, the electroweak symmetry breaking scale. But this is no "blackhole", as only longitudinal weak bosons, plus perhaps one or two gluons, are emitted. Although we cannot estimate the QQ(bar) annihilation rate since the Yukawa coupling is now nonperturbative, but given that individual t' or b' decays are either suppressed by phase space (t' -> b' or b' -> t') or quark mixing, we view QQ(bar) -> nV as the likely outcome for ultra heavy QQ(bar) production at the LHC and beyond, which should be taken into account by the experiments.
        Speaker: Prof. George W.-S. Hou (National Taiwan University (TW))
      • 18:00
        Higgs boson coupling measurements at the LHC using H->tau tau decays. 1h
        We investigate the potential for measuring the relative couplings of a low-mass Higgs boson at the Large Hadron Collider using W H, ZH, and ttH production, where the Higgs boson decays to tau-lepton pairs. With 100 fb−1 of sqrt(s) = 14 TeV pp collision data we find that these modes can improve coupling-ratio sensitivity for a Higgs boson mass between 115 and 135 GeV/c2 .
        Speaker: Dr Sinead Farrington (University of Oxford (UK))
        Slides
      • 18:00
        Identification of b-quark jets in the CMS experiment 1h
        The identification of jets associated with the production of b quarks is an essential tool both for the measurement of standard-model processes and in the search for physics beyond this model at the Large Hadron Collider. The CMS experiment has developed a variety of algorithms that use the impact parameters of charged-particle tracks, the properties of reconstructed decay vertices, the presence of a lepton or combinations of these quantities to select samples of jets with different b purities. Proton-proton collisions recorded in 2011 and corresponding to an integrated luminosity of 5.0 fb-1 have been used to compare the quality of the reconstruction with expectations from simulation. The performance of the algorithms in terms of efficiency and misidentification probability has been measured from multi jet events and from top-quark pair events.
        Speaker: Prof. Sudhir Malik (University of Nebraska-Lincoln (US))
        Poster
      • 18:00
        Inelastic J/Psi double differential cross sections 1h
        The double differential inelastic J/psi photoproduction cross section as function of the squared transverse momentum of the J/psi in bins of the inelasticity z has been measured in ep collisions with the ZEUS detector at HERA. An integrated luminosity of 468 pb-1 was used corresponding to the full data sample collected by the ZEUS experiment. The events were required to have 0.1 < z < 0.9, pt > 1 GeV and 60 < W < 240 GeV, where pt is the transverse momentum of the J/psi and W is the photon-proton centre-of-mass energy. The J/psi mesons were identified through their decay into muon pairs. The double differential cross section measurements are compared to the most recent theoretical predictions.
        Speaker: Dr Alessandro Bertolin (INFN Padova)
        Poster
      • 18:00
        Large Jet Multiplicities and New Physics at the LHC 1h
        A broad class of scenarios for new physics involving additional strongly-interacting fields predict signatures at hadron colliders which consist solely of large numbers of jets and substantial missing transverse energy. We investigate the prospects for discovery in such scenarios using a search strategy in which jet multiplicity and missing transverse energy are employed as the primary criteria for distinguishing signal from background. We examine the discovery reach this strategy affords in an example theory (a simplified supersymmetric model whose low-energy spectrum consists of a gluino, a light stop, and a light neutralino) and demonstrate that it frequently exceeds the reach obtained via other, alternative strategies.
        Speaker: Dr Jason Kumar (University of Hawaii (US))
        Slides
      • 18:00
        Longitudinal structure function using Thermodynamical Bag model 1h
        A thermodynamical bag model is used to calculate the nucleon structure function by treating the quarks and gluons as Fermi and Bose gases. It is found to agree well with the experimental data. In this article this model is used to calculate the longitudinal structure function which is related to the ratio of absorption cross section for longitudinally and transversely polarized virtual photons. This can then be campared with the corresponding experimental values and other models.
        Speaker: Dr Krishna Kumar Singh (Bits Pilani Dubai Campus (AE))
      • 18:00
        Measurement of the Azimuthal Correlation between the most Forward Jet and the Scattered Positron in Deep-Inelastic Scattering at HERA 1h
        Deep-inelastic positron-proton scattering events at low photon virtuality Q2 with a forward jet, produced at small angles with respect to the proton beam, are measured with the H1 detector at HERA. A subsample of events with an additional jet in the central region is also studied. For both samples differential cross sections and normalised distributions are measured as a function of the azimuthal angle difference, ∆φ, between the forward jet and the scattered positron. The sensitivity to QCD evolution mechanisms is tested by comparing the data to predictions of Monte Carlo generators based on different evolution approaches as well as to next-to-leading order calculations.
        Speaker: . H1 Collaboration (DESY)
      • 18:00
        Measurement of the electron neutrino component of the T2K beam at ND280 1h
        One of the main physics goal of the T2K experiment is the measurement of the angle theta_13 in the neutrino mixing matrix. This is done through the observation of nu_e appearance in the nu_mu neutrino beam. The main background to this measurement is the intrinsic nu_e beam component that has to be measured before the oscillation at the T2K Near Detector (ND280). We performed two analyses to at ND280 to measure this component, using the data collected during the first two T2K physics runs. One analysis uses the pi0 detector (P0D) to select high energy electrons measuring in this way the high energy part of the nu_e contamination in the T2K beam mainly coming from the Kaon component.The other analysis selects neutrino interactions in the Fine Grained Detector (FGD) of ND280 and distinguish electrons from muons combining the PID capabilities of three Time Projection Chambers (TPC) and an Electromagnetic Calorimeter (ECAL). The results of these two measurements provide confidence in the understanding of the intrinsic nu_e beam component of the T2K beam simulation and in the T2K nu_e appearance results.
        Speaker: Dr Glenn Lopez (Stony Brook University (US))
      • 18:00
        Measurement of the inclusive production cross sections for forward jets and forward - central dijets in CMS at sqrt{s} = 7 TeV 1h
        We present the measurements of inclusive production cross sections for forward jets, as well for jets in dijet events with at least one jet emitted at central and the other at forward pseudorapidities in proton-proton collisions at sqrt{s} = 7 TeV. The measurements were performed in the range of transverse momenta pT = 35 – 150 GeV/c within pseudorapidities 3.2 < |eta| < 4.7, and central jets within the |eta| < 2.8 range. The differential cross sections d2sigma/dp_T d_eta are compared to predictions from three approaches in perturbative quantum chromodynamics: (i) next- to-leading-order calculations obtained with and without matching to parton-shower Monte Carlo simulations, (ii) PYTHIA and HERWIG parton-shower event generators with different tunes of parameters, and (iii) CASCADE and HEJ models, including different non-collinear corrections to standard single-parton radiation.
        Speaker: Dr Salim Cerci (Cukurova University (TR))
        Poster
      • 18:00
        Measurement of the Z to tau tau cross section with the ATLAS detector 1h
        The Z to tau tau cross section has been recently measured using data collected with the ATLAS detector corresponding to the integrated luminosity of 1.34 − 1.55 fb-1. The analysis is performed in three different final states determined by decay modes of the tau leptons - so-called electron + hadronic tau, muon + hadronic tau and electron + muon channels. Cross sections are measured separately in each final state in a fiducial kinematic phase space, and also extrapolated to the full phase space in the invariant mass region 66 − 116 GeV. The individual cross sections are combined together and the product of the total Z boson production cross section and Z to tau tau branching fraction is measured to be 0.92 +/- 0.20(stat) +/- 0.08(syst) +/- 0.03(lumi) nb, in agreement with the NNLO theoretical expectation.
        Speaker: Ms Jana Novakova (Charles University (CZ))
        Slides
      • 18:00
        Measuring the b-jet tagging efficiency using top quark pairs events with ATLAS data 1h
        Many physics analyses with the ATLAS detector expect to have jets originating from b-quarks in the final state. Algorithms that allow to identify such jets are thus of great importance and it is crucial to study their performance directly in data by measuring the tagging efficiencies and fake rates. Since the top quark almost exclusively decays to a W boson and a b-quark, a sample of top quark pairs events is ideal for studying the b-tagging performance. Final states containing one or two leptons have been used to measure the b-tagging efficiency, either by counting the number of b-tagged jets, by exploiting the kinematics of top quark pairs decays and flavor composition of studied sample or by applying kinematical fit to extract sample rich in b-jets.
        Speaker: Ms Agnieszka Leyko (Universitaet Bonn (DE))
        Slides
      • 18:00
        MINERvA: CC Inclusive Cross Section Ratio 1h
        This poster presents preliminary results from the MINERvA experiment. We present the muon neutrino CC inclusive cross section measurement, performed as a ratio across different nuclear materials.
        Speaker: Dr Heather Ray (University of Florida)
      • 18:00
        Model Independent Search for New Phenomena in ppbar Collisions at sqrt(s) = 1.96 TeV 1h
        We describe a model independent search for physics beyond the standard model in lepton final states. We examine 117 final states using 1.1 fb-1 of ppbar collisions data at sqrt(s) = 1.96 TeV collected with the D0 detector. We conclude that all observed discrepancies between data and model can be attributed to uncertainties in the standard model background modeling, and hence we do not see any evidence for physics beyond the standard model.
        Speakers: James Alexander Kraus (Michigan State University (US)), Dr James Kraus (Michigan State University)
        Slides
      • 18:00
        Muon fast Track Tag : A muon trigger upgrade for CMS at the HL-LHC 1h
        In the high luminosity LHC scenario (HL-LHC) with a luminosity up to ten times higher than at LHC and running at 14 TeV centre-of-mass energy, it will be important to rely on a more accurate transverse momentum resolution in order to keep the trigger rate under control and reach low pT thresholds. In order to improve the transverse momentum resolution the idea is to combine the high precision tracking information from the inner Tracker detector with a reliable muon trigger. An additional detector layer behind the CMS magnet and in front of the first muon stations could be realized by fast plastic scintillator tiles read out by silicon photomultipliers (SiPMs), possibly via wave length shifting fibres. In addition to tag a selective Tracker readout region, the MTT layer helps to resolve ambiguities at high muon rates in the innermost muon stations. The poster will discuss the development of a MTT prototype module and concentrates on the characterization of SiPMs in combination with fast plastic scintillators. Different possible scenarios are presented.
        Speaker: Dr Oliver Pooth (Rheinisch-Westfaelische Tech. Hoch. (DE))
        Poster
      • 18:00
        Non-collision backgrounds in ATLAS 1h
        The proton-proton collision events recorded by the ATLAS experiment are on top of a background that is due to both collision debris and non-collision components. The latter comprises of three types: beam-induced backgrounds, cosmic particles and detector noise. We present studies that focus on the first two of these. We give a detailed description of beam-related and cosmic backgrounds based on the full 2011 ATLAS data set, and present their rates throughout the whole data-taking period. Studies of correlations between tertiary proton halo and muon backgrounds, as well as, residual pressure and resulting beam-gas events seen in beam-condition monitors will be presented. Results of simulations based on the LHC geometry and its parameters will be presented. They help to better understand the features of beam-induced backgrounds in each ATLAS sub-detector. The studies of beam-induced backgrounds in ATLAS reveal their characteristics and serve as a basis for designing rejection tools that can be applied in physics analyses. Basic jet quality criteria are derived which provide high non-collision background suppression while maintaining low-signal rejection. These criteria serve as a baseline for the event cleaning procedure recommended for all ATLAS analyses. Furthermore, beam-background muon and cosmic-muon identification tools are described. They do not utilize jet quantities and therefore provide yet another independent approach to event cleaning. Performance of these tools are demonstrated with the example of the monojet search by ATLAS, where the physics signal topology can be also formed by jets faked by beam-background muons with large radiative energy loss in calorimeters.
        Speaker: Dr Stephen Gibson (CERN (CH))
        Poster
      • 18:00
        Optimization of neutrino fluxes for future long baseline neutrino oscillation experiment 1h
        We present an optimization of the neutrino beam which could be produced at CERN and aimed to the newly proposed deep-underground neutrino observatory LAGUNA-LBNO located at distance of about 2300 km (Phyasalmi mine, Finland). Specific scenarios for the proton driver and the far detectors have been investigated. In particular, the flux predictions have been obtained by means of a full GEANT4 simulation of the primary proton beam interaction in the target, the secondary hadrons focusing system (e.g. horn-reflector layout) and the decay pipe. A dedicated algorithm has been then developed to search for the optimal configuration of the beam line by scanning the multidimensional space of the desgin parameters. The aim is to maximize the LAGUNA-LBNO physics performance in terms of the discovery potential for both the CP violation phase delta_CP and the mass hierarchy. For different CERN SPS proton beam energies sensitivity limits will be presented as a function of the beam exposure and the far detector fiducial mass.
        Speaker: Dr Silvestro Di Luise (Eidgenoessische Tech. Hochschule Zuerich (CH))
        Slides
      • 18:00
        Parametrizing the Neutrino sector of the seesaw extension in tau decays 1h
        The Standard Model includes neutrinos as massless particles, but neutrino oscillations showed, that neutrinos are not massless. A simple extension of adding gauge singlet fermions to the particle spectrum allows normal Yukawa mass terms for neutrinos. Then smallness of the neutrino masses can be well understood within the seesaw mechanism (type I). After spontaneous symmetry breaking of the Standard Model gauge group one obtains a $(n_L+n_R)\times(n_+n_R)$ Majorana mass matrix $M_{\nu}$ for neutrinos. The mixing between the $n_R$ right-handed neutrino singlets and the neutral parts of the $n_L$ lepton doublets gives masses for the neutrinos which are of the size expected from neutrino oscillations. The diagonalization of the mass matrix gives rise to a split spectrum consisting of heavy and light states of neutrinos given by$U^T M_{\nu}U=\mathrm{diag}(m^{light}_{n_L},m^{heavy}_{n_R})$. For the case $n_R=1$ we diagonalize the neutral fermion mass matrix with a rotation matrix $U$ determined by two complex angles, two masses, and two Majorana phases. For the case $n_R=2$ we parametrize the mass matrix with a rotation matrix $U$ determined by two complex angles, four masses, and four Majorana phases. In both cases we take $n_L=3$. We calculate the 1-loop radiative corrections to the mass parameters of the neutrino sector of the seesaw extension of the Standard Model which produce mass terms for the neutral leptons. With these ingredients we plan to look at the process $W^{\pm}\to\tau^{\pm}+\nu\to h_1^{\pm}+h_2^{\mp}+h_3^{\pm}+\nu+\nu$. In the future we plan to apply our parametrization to study the $\tau$ polarization coming from the decay of a $W$ boson in the data of the CMS experiment at LHC and thus determine restrictions to the parameters of the neutrino sector.
        Speaker: Dr Darius Jurciukonis (Vilnius University (LT))
        Poster
      • 18:00
        Parity of Pions and CP Violation in Neutral Kaon System 1h
        The parity of pions will be discussed within the framework of the Generation Model [1] of particle physics and it will be shown that both the 1954 determination [2] of the parity of the charged pions and the 2008 determination [3] of the parity of the neutral pion are compatible with the mixed-parity nature of the pions predicted by a recent composite Generation Model [4]. The development of the Generation Model as an alternative to the Standard Model of particle physics will be discussed. It will be demonstrated how the Generation Model leads to a unified classification of leptons and quarks and how this makes feasible a composite model of the fundamental particles of the Standard Model. In particular it will be shown that the 1964 CP violating experiment of Christenson et al. [5] may be understood without CP violation. [1] B.A. Robson, Int. J. Mod. Phys. E 11 (2002) 555; Int. J. Mod. Phys. E 13 (2004) 999. [2] W. Chinowsky and J. Steinberger, Phys. Rev. 95 (1954) 1561. [3] E. Abouzaid et al., Phys. Rev. Lett. 100 (2008) 182001. [4] B.A. Robson, Int. J. Mod. Phys. E 20 (2011) 733. [5] J.H. Christenson, J.W. Cronin, V.L. Fitch and R. Turlay, Phys. Rev. Lett. 13 (1964) 138.
        Speaker: Dr Brian Robson (Australian National University (AU))
      • 18:00
        Performance of the ATLAS Transition Radiation Tracker 1h
        The ATLAS Transition Radiation Tracker (TRT) is an integral subsystem for precision tracking at ATLAS. In addition, transition radiation signatures allow for particle identification capabilities. Monitoring the performance of the TRT helps establish the necessary foundation for understanding higher level tracking reconstruction and particle identification. We present our current studies on how the TRT is performing, in particular as the number of interactions per bunch crossing increases.
        Speaker: Mr Kevin Daniel Finelli (Duke University (US))
        Slides
      • 18:00
        Physics and detector studies with the very forward calorimeters at a future linear collider 1h
        The very forward region at a future e+e- collider detector will be instrumented with calorimeters dedicated primarily for precise measurement of the integral luminosity, providing at the same time information for beam-tuning, shielding of the inner detectors and also improving the overall detector hermeticity. Detector designs optimized for the ILC and CLIC colliders are presented, with emphasis on the precise integral luminosity measurement. Physics and machine-related effects are discussed, contributing dominantly to the systematic uncertainty in the luminosity measurement. In addition, recent results of the performance studies of sensor planes for the ILC forward calorimeters assembled with the dedicated FE and ADC ASICs are given.
        Speaker: Dr Ivanka Bozovic-Jelisavcic (Vinca Institute of Nuclear Sciences, University of Belgrade (RS))
        Poster
      • 18:00
        Production of the heaviest charged Higgs boson in 3-3-1 models 1h
        In this work we study the production cross section of the heaviest charged Higgs bosons (H_2^±) predicted by the SU(3)_c X SU(3)_L X U(1)_x gauge model (3-3-1 model) without exotic charges. Taking into account intermediate vector bosons, including a new Z’ neutral boson predicted by the model, we calculate the cross section of H_2^± pair production in Drell-Yan processes at CERN-LHC hadron collider. For two Z’ masses (M_Z'=1.8 and 2.2 TeV) we found that the cross section decreases appreciably at the H_2^± mass values of 0.9 TeV and 1.1 TeV, respectively. In order to explore differences with other charged Higgs bosons, we compare our results with the lighter H_1^± Higgs of the same model and the charged Higgs boson of the Two Higgs Doublet Model (2HDM), where we found that it is possible to distinguish the H_2^± bosons from others charged bosons.
        Speaker: Dr Fredy Ochoa (Universidad Nacional de Colombia Sede Bogota (CO))
        Poster
      • 18:00
        Recent result on search for nucleon decay and neutron-antineutron oscillation in Super-Kamiokande 1h
        We present recent results of the search for baryon number violating phenomena predicted by GUTs in Super-Kamiokande covering nucleon decay and neutron-antineutron oscillation. Grand Unified Theories (GUTs) seek to unify the strong and electroweak forces, and a unique prediction of the GUTs is baryon number violation. Two quarks in a nucleon can transform into a lepton and an antiquark resulting in a lepton plus meson final state. Super-Kamiokande (SK) is ring imaging water Cherenkov detector, containing 50 ktons of ultra-pure water, located in Kamioka-town in Gifu prefecture, Japan. The Super-Kamiokande experiment had started obvservation in 1996, and we collected data in four periods:SK-I (91.7kton year exposure), II (49.2 kton yr), III (31.9kton yr) and IV (on-going). We present the results on search for $p \rihgtarrow e^{+}+\pi^0$, $p \rihgtarrow \mu^{+}+\pi^0$, and $p \rihgtarrow \nu +\K^+$ based on SK-I to SK-IV data (219.8 kton yr exposure). The other nucleon decay modes to meson plus anti-leptons are also presented based on SK-I, SK-I+II, or SK-I+II+III data. Another possibility allowed by some of GUTs and Super Symmetric models is that neutron spontaneously changes to antineutron (called neutron-antineutron oscillation). We plan to present the final result of neutron-antineutron oscillation search in SK-I.
        Speaker: Dr Jun Kameda (ICRR, University of Tokyo (JP))
        Slides
      • 18:00
        Search for a Heavy Exotic partner of the top quark with charge 5/3 1h
        Presented is a study of searches for two exotic particles - a heavy top quark partner with a fractional charge of 5/3, $T_{5/3}$, and its partner, the heavy $B$ quark with charge -1/3. These particles decay to a top quark and a $W$ boson, leading to very busy events with multi-leptons and multi-jets. Processes where same-sign dileptons are produced are considered. The backgrounds are predominantly from $t\overline t$, QCD multi-jets, $Z$+jets, $t\overline t WW$, $t\overline t W$ and multiple-$W$+jets production. A study using the data collected by the CMS detector at the LHC during 2011 has been performed. Speakers
        Speaker: Ms Saptaparna Bhattacharya (Brown University (US))
      • 18:00
        Search for charged long-lived heavy particles with the ATLAS experiment at the LHC 1h
        We report on a search for charged long-lived heavy particles, as predicted by several beyond the Standard Model theories. Such particles can be detected in ATLAS through anomalous specific ionisation measured in the Pixel detector, their slow motion (beta<1) measured in the calorimeter, and also through their possible muon-likeness in the Muon Spectrometer. Results of this search on the full data sample collected by ATLAS during 2011 are shown, both with a Pixel detector based approach and by combining the information from various subdetectors.
        Speaker: Dr Elisa Guido (INFN-Genova (IT))
        Slides
      • 18:00
        Search for exotic VZ resonances decaying into a jet and dileptons with CMS 1h
        We present a search by the CMS experiment for new exotic particles decaying to the VZ final state, where V is either a W or a Z decaying hadronically and the Z decays to dielectrons or dimuons. The analysis uses the full 2011 dataset at √s = 7 TeV.
        Speaker: Ms Flavia De Almeida Dias (UNESP - Universidade Estadual Paulista (BR))
        Poster
      • 18:00
        Search for Higgs decaying to tau tau at CMS 1h
        Results are presented on the search for the standard model Higgs boson decaying into two tau leptons, using both leptonic and hadronic decays of the tau. The sample are split into various categories to enhance the search sensitivity. The full data sample of 4.7 fb-1 of pp collisions collected in 2011 with the CMS experiment at a CM energy of 7 TeV have been analyzed, as well as a significant fraction of the 2012 luminosity delivered so far at the new energy of 8 TeV.
        Speaker: Ms Agni Bethani (DESY (DE))
      • 18:00
        Search for large extra dimensions in dielectron events in pp collisions at √s = 7 TeV at CMS 1h
        We present a poster to report the results of a search for large extra dimensions in events with two isolated electrons using the whole 5 fb^-1 of data collected with the CMS detector at the LHC in 2011. The exclusion limits on the parameters of different models with different assumptions on the validity range of the model are shown
        Speaker: Mr Seyed Mohsen Etesami (Institute f. Studies in Theoretical Physics and Mathematics (IR))
      • 18:00
        Search for MSSM Higgs decaying to mu mu at CMS 1h
        The search for the neutral Higgs bosons decaying via the mu+mu- channel in the MSSM m^max_h scenario is presented. The analysed data were recorded in 2011 with the CMS detector at 7 TeV centre of mass energy. The 95% C.L. exclusion limits on the cross section times branching ratio and the (m_{A^0}, tan\beta) limits are presented.
        Speaker: Dr Adrian Perieanu (RWTH Aachen (DE))
        Slides
      • 18:00
        Search for muon to electron conversion at J-PARC 1h
        The COMET experiment at J-PARC is an experiment to search for muon to electron conversion at a single event sensitivity of 3x10^{-16}. This process is charged-lepton flavor violating. We are planning to stage the COMET experiment. The staging approach is endorsed by J-PARC PAC and KEK. We will present the details of COMET Phase-I.
        Speaker: Prof. Yoshitaka Kuno (Osaka University (JP))
        Slides
      • 18:00
        Search for RS Gravitons decaying into a Jet plus Missing ET with CMS 1h
        We search for the production of heavy resonances in proton-proton collisions at sqrt(s) = 7 TeV, with the Randall-Sundrum graviton as a benchmark model. We focus on the G to ZZ to qqbar nunubar reaction with boosted Z bosons. We look for the jet plus missing transverse energy signature in the 4.7 fb^-1 of data collected by the CMS detector during 2011. Since the event yield is compatible with what would be expected solely from Standard Model processes, we are able to derive limits on the cross-section for the RS graviton production, and hence on the parameters of the Warped Extra Dimensions model. The cross-section 95% confidence upper limits are found to be in the range [0.047, 0.021] pb for resonance masses ranging between 1000 and 1500 GeV. We extend the k/MPl search range to values up to 0.3, and translate the cross-section limits to the (mG, k/MPl) parameter space. In that way, we set 95% confidence upper limits on the coupling parameter k/MPl in the range 0.11 to 0.29, for the aforementioned resonance mass range.
        Speaker: Thiago Fernandez Perez Tomei (UNESP - Universidade Estadual Paulista (BR))
        Poster
      • 18:00
        Search for Single-Top Production in ep Collisions at HERA 1h
        A search for single-top production, ep -> etX, has been performed with the ZEUS detector at HERA using data corresponding to an integrated luminosity of 0.37 fb-1. No evidence for top production was found, consistent with the expectation from the Standard Model. Limits were computed for single-top production via flavour changing neutral current transitions.The result was combined with a previous ZEUS result yielding a total luminosity of 0.50 fb-1. A 95% credibility level upper limit of 0.13 pb was obtained for the cross section at the centre-of-mass energy of sqrt{s}=315 GeV.
        Speaker: Dr Katarzyna Wichmann (DESY)
        Poster
      • 18:00
        Search for SM Higgs boson in 2l2tau final state 1h
        Results are presented on the search for the standard model Higgs boson decaying into two Z bosons, with one boson decaying into a pair of charged leptons, either muons or electrons, and the other boson decaying into a pair of taus which taus decay both hadronically and leptonically. This analysis is mainly sensitive for Higgs masses higher than 180 GeV where both Z's are on-shell. For low mass Higgs boson with the same final state, the Z associated Higgs production with Higgs decay into tau tau and WW have been investigated. The full data sample of 4.7 fb-1 of pp collisions collected in 2011 at a CM energy of 7 TeV with the CMS experiment have been analyzed, as well as a significant fraction of the 2012 luminosity delivered so far at the new energy of 8 TeV.
        Speaker: Prof. Gobinda Majumder (Tata Inst. of Fundamental Research (IN))
        Slides
      • 18:00
        Search for SM Higgs decaying to WW and WW production cross section measurement at CMS 1h
        Results are presented on the search for the standard model Higgs boson decaying into two W bosons, with each W boson decaying into a charged lepton and a neutrino. The full data sample of 2012 luminosity delivered so far at the new energy of 8 TeV has been analyzed. WW production cross section is also presented.
        Speaker: Lara Lloret Iglesias (Universidad de Oviedo (ES))
        Slides
      • 18:00
        Search for Standard Model Higgs boson decaying into 4 leptons with CMS detector 1h
        A search for a Higgs boson in the four-lepton decay channel Higgs to ZZ(*), with each Z boson decaying to an electron or muon pair, is presented using 4.7 fb-1 of integrated luminosity collected during 2011 as well as considerable fraction of 2012 integrated luminosity recorded by the CMS detector in pp collisions from the LHC at CM energy of 7 TeV. The search covers Higgs boson mass hypotheses of 110 < mH < 135 GeV/c2 and 305 < mH < 340 GeV/c2. Upper limits at 95% CL on the product of the cross section and branching ratio as well as the p-value for the Standard Model Higgs boson are presented.
        Speaker: Dr Christian Veelken (Ecole Polytechnique (FR))
        Slides
      • 18:00
        Search for supersymmetry in events with a Z boson, jets and missing energy using the JZB method 1h
        We present a search for Physics beyond the Standard Model (SM) in final states with a Z boson, jets and missing transverse energy, using the full data sample collected in 2011 by the CMS detector at the Large Hadron Collider corresponding to an integrated luminosity of 4.7 /fb. This final state is predicted in several models of Physics beyond the SM, including supersymmetry. The Jet-Z Balance method is used and a precise determination of the total SM background is obtained using control samples from data. In the absence of any significant excess beyond the SM background, upper limits are set on simple models of supersymmetry, and further information is provided to allow confrontation of other models to these results.
        Speaker: Marco Andrea Buchmann (Eidgenoessische Tech. Hochschule Zuerich (CH))
        Slides
      • 18:00
        Search for violation of Lorentz invariance in top quark pair production and decay 1h
        Using data collected with the D0 detector at the Fermilab Tevatron Collider, corresponding to 5.3 fb-1 of integrated luminosity, we search for violation of Lorentz invariance by examining the ttbar production cross section in lepton+jets final states. We quantify this violation using the standard-model extension framework, which predicts a dependence of the ttbar production cross section on sidereal time as the orientation of the detector changes with the rotation of the Earth. Within this framework, we measure components of the matrices (c_Q)_{mu nu 33} and (c_U)_{mu nu 33} containing coefficients used to parametrize violation of Lorentz invariance in the top quark sector. Within uncertainties, these coefficients are found to be consistent with zero.
        Speaker: Physics Coordinators D0
      • 18:00
        Searches for vector-like quarks 1h
        We present results from searches for heavy exotic vector-like quarks performed using 5 fb-1 data sample of pp collisions at the center-of-mass energy of 7 TeV collected by the CMS detector at LHC.
        Speaker: Prof. Kai-Feng Chen (National Taiwan University (TW))
        Poster
      • 18:00
        Should we still believe in constrained supersymmetry? 1h
        We calculate Bayes factors to quantify how the feasibility of the constrained minimal supersymmetric model (CMSSM) has changed in the light of a series of observations. This is done in the subjective Bayesian spirit where probability reflects a degree of belief in a proposition and Bayes' theorem tells us how to update it after acquiring new information. Our experimental baseline is the approximate knowledge that was available before LEP, and our comparison model is the Standard Model with a simple dark matter candidate. To quantify the amount by which experiments have altered our relative belief in the CMSSM since the baseline data we compute the Bayes factors that arise from learning in sequence the LEP Higgs constraints, the XENON100 dark matter constraints, the 2011 1 $\text{fb}^{-1}$ LHC supersymmetry search results, and the early 2012 LHC Higgs search results. We find that LEP and the LHC strongly shatter our trust in the CMSSM (with $M_0$ and $M_{1/2}$ below 2 TeV), reducing its posterior odds by a factor of approximately three orders of magnitude. This reduction is largely due to the substantial Occam factors induced by the LEP and LHC Higgs searches and the poor maximum likelihood fit to the LHC Higgs search results.
        Speaker: Mr Benjamin Farmer (Monash University (AU))
      • 18:00
        Single top production from diquark resonance at the LHC 1h
        New physics at the TeV scale is highly anticipated at the LHC. New particles with color, if within the LHC energy reach, will be copiously produced. One such particle is a diquark, having the quantum numbers of two quarks, and can be a scalar or a vector. It will decay to two light quarks, or two top quarks, or a top and a light quark, (up or down type depending on the quantum number of the produced diquark). If singly produced, it can be looked for as a dijet resonance, or as giving extra contribution to the single top production or tt production. In this talk, we consider a diquark having the quantum number of (ud) type, its resonance production, and the subsequent decay to tb, giving rise to excess contribution to the single top production. Even though the diquark mass is large, its strong resonance production dominate the weak production of tb for a wide range of the diquark mass. Also its subsequent decay to tb produce a very hard b-jet compared to the usual electroweak production. In addition, the missing energy in the final state event is much larger from the massive diquark decays. Thus, with suitable cuts, the final state with b, bar{b} and a charged lepton together with large missing energy stands out compared to the Standard Model background. We make a detailed study of both the signal and the background. We find that such a diquark is accessible at the 7 TeV LHC upto a mass of about 3.3 TeV with the luminosity 1 fb^{-1}, while the reach goes up to about 4.3 TeV with a luminosity of 10 fb^{-1}. I will also briefly review the other aspects of diquark production, such as top pair production (tt) and the asociated signal at the LHC.
        Speaker: Prof. Satyanarayan Nandi (Oklahoma State University (US))
      • 18:00
        Static Gravitational Fields at Finite Temperature 1h
        We investigate the two loop contributions to the effective action of static gravitational fields at finite temperature. This allows us to take into account the effects of interactions of the thermal particles and the resulting higher loop contributions to the pressure of thermal matter in a gravitational background.
        Speaker: Dr Fernando T Brandt (Universidade de São Paulo)
        Poster
      • 18:00
        Structure function with higher twist contribution in the thermodynamical Bag Model 1h
        In the Thermodynamical Model the quarks and gluons are treated as Fermi adn Bose gases.The nucleon structure functions calculated using this model agree well with the experimental values.Hence we now propose to use this model to calculate the nucleon structure functions including the higher twist contributions and compare with the corresponding experimental data. This throws more light on the quark structure function of the nucleon.
        Speaker: Dr Krishna Kumar Singh (Bits Pilani Dubai Campus (AE))
      • 18:00
        Tau reconstruction and identification at CMS 1h
        CMS has developed sophisticated tau identification algorithms for tau hadronic decay modes. Production of tau lepton decaying to hadrons are studied at 8 TeV centre of mass energy with 2012 collision data collected by CMS detector and has been used to measure the performance of tau identification algorithms by measuring identification efficiency and mis-identification rates from electrons, muons, and hadronic jets.
        Speaker: Mr Raman Khurana (Saha Institute of Nuclear Physics (IN))
        Slides
      • 18:00
        Tau-lepton Charge asymmetry at the LHC: A probe to new physics models 1h
        Lepton charge asymmetry, LHC analog of the forward-backward asymmetry of the Teavtron, can be an useful tool to probe new physics that "hides-out" from the dilepton invariant mass distribution due to large SM background in the tail region. To demonstrate how sensitive it can be to the new physics models, we will consider example of models which may or "may not" leave their imprints in the dilepton invariant mass distribution.
        Speaker: Dr Sudhir Kumar Gupta (Monash University (AU))
        Slides
      • 18:00
        Tetraquark-based analysis and predictions of the cross sections and distributions for the processes e^+ e^- -> Upsilon(1S) (pi^+ pi^-, K^+ K^-, eta pi^0) near Upsilon(5S) 1h
        We calculate the cross sections and final state distributions for the processes e^+ e^- -> Upsilon(1S) (pi^+ pi^-, K^+ K^-, eta pi^0) near the Upsilon(5S) resonance based on the tetraquark hypothesis. This framework is used to analyse the data on the Upsilon(1S) pi^+ pi^- and Upsilon(1S) K^+ K^- final states, yielding good fits. Dimeson invariant mass spectra in these processes are shown to be dominated by the corresponding light scalar and tensor states. The resulting correlations among the cross sections are worked out. We also predict sigma(e^+ e^- -> Upsilon(1S) K^+ K^-)/sigma(e^+ e^- -> Upsilon(1S) K^0 Kbar^0) = 1/4. These features provide crucial tests of the tetraquark framework and can be searched for in the currently available and forthcoming data from the B factories.
        Speaker: Dr Satoshi Mishima (INFN Rome (IT))
        Poster
      • 18:00
        The ATLAS hadronic tau trigger 1h
        With the high luminosities of proton-proton collisions achieved at the LHC, the strategies for triggering have become more important than ever for physics analysis. The naïve inclusive single tau lepton triggers now suffer from severe rate limitations. To allow for a large program of physics analyses with taus, the development of topological triggers that combine tau signatures with other measured quantities in the event is required. These combined triggers open many opportunities to study new physics beyond the Standard Model and to search for the Standard Model Higgs. We present the status and performance of the hadronic tau trigger in ATLAS. We demonstrate that the ATLAS tau trigger ran remarkably well over 2011, and how the lessons learned from 2011 led to numerous improvements in the preparation of the 2012 run. These improvements include the introduction of tau selection criteria that are robust against varying pileup scenarios, and the implementation of multivariate selection techniques in the tau trigger. First results from the improved 2012 tau trigger will be shown. Measurements of the trigger efficiency using the Z->tautau and W->taunu events are also presented.
        Speaker: Mr Curtis William Black (University of Sydney (AU))
      • 18:00
        The ATLAS Muon Trigger Performance in pp collisions 1h
        Events with muons in the final state are an important signature for many physics topics at Large Hadron Collider (LHC), for instance, searches for Higgs boson production or new phenomena, measurements on the standard model processes like top-quark, W, Z production. Thus, efficient trigger on muons in data taking and understanding its performance are crucial to perform these physics studies. At LHC high rejection power against large backgrounds, while maintaining high efficiency for rare signal events, is required already at such online trigger stage. The ATLAS experiment employs a multi-level trigger architecture that selects the events in three sequential steps of increasing complexity and accuracy to cope with this challenging task. This poster reports about efficiency and general performance of the ATLAS muon trigger in proton-proton collisions at sqrt(s)=7 TeV in 2011 runs and also at sqrt(s)=8 TeV in 2012 runs.
        Speaker: Dr Takashi Kubota (University of Melbourne (AU))
        Slides
      • 18:00
        The ATLAS Tau Reconstruction and Identification Algorithms and Performance at ATLAS 1h
        Tau leptons play an important role in the physics program at the LHC. They are used not only in searches for new phenomena like the Higgs boson or Supersymmetry and electroweak measurements but also in detector related studies like the determination of the missing transverse energy scale. Optimal identification of hadronically decaying tau leptons is achieved by using detailed information from tracking and calorimeter detector components. Variables describing the properties of calorimeter energy deposits and track reconstruction within tau candidates are combined in multi-variate discriminants, to achieve high rejection against backgrounds, which is challenging in high luminosity environments. The identification efficiencies are measured by W->taunu and Z->tautau events, and compared with the prediction of the Monte Carlo simulation. The energy scale uncertainties for tau leptons are determined by investigating single hadron calorimeter response, as well as kinematic distributions in Z->tautau events.
        Speaker: Mr Kong Guan Tan (University of Melbourne (AU))
      • 18:00
        The large-angle photon veto system for the NA62 experiment at CERN 1h
        The branching ratio (BR) for the decay K^+ \to \pi^+\nu\bar{\nu} is a sensitive probe for new physics. The NA62 experiment at the CERN SPS will measure this BR to within about 10%. To reject the dominant background from channels with final state photons, the large-angle vetoes (LAVs) must detect photons with energies as low as 200 MeV with an inefficiency of less than 10^{-4}, as well as provide energy and time measurements with resolutions of \sim 10% and 1 ns for 1 GeV photons. The LAV detectors make creative reuse of lead-glass blocks recycled from the OPAL electromagnetic calorimeter barrel. We describe the mechanical design and challenges faced during construction, the development of front-end electronics to allow simultaneous time and energy measurements over an extended dynamic range using the time-over threshold technique, and the development of an in-situ calibration and monitoring system. Our results are based on test beam data collected using prototypes of the LAV detectors.
        Speaker: Cristina Biino (Universita e INFN (IT))
        Slides
      • 18:00
        The light pseudoscalar meson transition form factor 1h
        We use the light fornt quark model in order to improve the theoretical prediction of the transition form factor of pi^{0} (eta(')) to gamma^* gamma as a function of the momentum transfer Q^2. We compare our result with the experimental data by BaBar as well as other calculations based on the LFQM. We show that our predicted form factor fits well with the experimental data, particularly those at the large Q^2 region.
        Speaker: Dr Chong Chung Lih (Department of Optometry, Shu-Zen College of Medicine and Management (TW))
        Slides
      • 18:00
        Universality of soft hadron spectra in pp and e+e- collisions 1h
        The success in understanding dynamics of soft particles inside jets relies on calculations of perturbative QCD, impressive accuracy of which have already been tested experimentally. However, the theory predicts, that the inclusive particle spectrum inside jets is independent of a collision energy in the limiting case of zero momentum ( p → 0 ). In order to test this prediction, a systematic study of world experimental data from hadron and lepton colliders at the collision energies from tenth of GeV up to the TeV scale at the LHC has been performed. In this work we present the consecutive analysis which confirms these predictions at the momentum region above 0.5 GeV/c. We demonstrate that for the particle momenta lower than 0.5 GeV/c the experimental data break this tendency and show up a new behavior.
        Speaker: Mrs Olga Driga (SUBATECH (FR))
    • 09:00 18:00
      ILCSC Room 209

      Room 209

      Melbourne Convention and Exhibition Centre

      Melbourne Australia

      closed meeting

    • 12:00 18:00
      IUPAP - C11 Room 216

      Room 216

      Melbourne Convention and Exhibition Centre

      Melbourne Australia

      closed meeting

    • 19:00 21:00
      ICFA Room 209

      Room 209

      Melbourne Convention and Exhibition Centre

      closed meeting

    • 09:00 11:00
      Opening Ceremony / LHC Higgs Search Updates Plenary 3

      Plenary 3

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        Official Opening 30m
      • 09:30
        Higgs - ATLAS 30m
        Speaker: Dr Richard Hawkings (CERN)
        Slides
      • 10:00
        Higgs - CMS 30m
        Speaker: Prof. Joseph Incandela (Univ. of California Santa Barbara (US))
        Slides
      • 10:30
        Higgs - Tevatron 30m
        Speakers: Dr Shalhout Shalhout (UCDAVIS), Dr Shalhout Shalhout (University of California Davis (US))
        Slides
    • 11:00 11:30
      Refreshment Break 30m
    • 12:30 13:50
      Lunch Break 1h 20m
    • 13:50 15:50
      EW Physics / SUSY Plenary 3

      Plenary 3

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 13:50
        Electroweak Physics Results 30m
        Speaker: Prof. Joao Barreiro Guimaraes Da Costa (Harvard University (US))
        Slides
      • 14:20
        EWSB - status/directions 30m
        Speaker: Prof. Alex Pomarol (Universitat Autonoma de Barcelona (ES))
        Slides
      • 14:50
        SUSY Searches (ATLAS/CMS): the Lady Vanishes 30m
        Speaker: Prof. Andy Parker (University of Cambridge (GB))
        Slides
      • 15:20
        SUSY - What's left? 30m
        Speaker: Prof. Raman Sundrum (University of Maryland (US))
        Slides
    • 15:50 16:10
      Refreshment Break 20m
    • 16:10 18:10
      Flavour Physics Plenary 3

      Plenary 3

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 16:10
        New Physics from Flavour 30m
        Speaker: Prof. Sheldon Stone (Syracuse University (US))
        Slides
      • 16:40
        Experimental Status of Rare Decays in Charged Leptons and Light Mesons 30m
        Speaker: Prof. Yoshitaka Kuno (Osaka University)
        Slides
      • 17:10
        Flavour Physics Theory Overview 30m
        Speaker: Dr cecilia tarantino (University Roma Tre)
        Slides
    • 18:00 19:30
      Pre-Dine Melbourne Drinks
    • 09:00 11:00
      QCD Plenary 3

      Plenary 3

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        Jet Production and QCD at High Energy Colliders 30m
        Speaker: Dr Dmitry Bandurin (Florida State University (US))
        Slides
      • 09:30
        PDF Measurements 30m
        Speaker: Dr Alexander Glazov (DESY (DE))
        Slides
      • 10:00
        Experimental results on Soft Strong Interactions 30m
        Speaker: Dr Paul Newman (Birmingham University (UK))
        Slides
      • 10:30
        Perturbative QCD Status 30m
        Speaker: Dr John Campbell (Fermi National Accelerator Laboratory)
        Slides
    • 11:00 11:15
      Refreshment Break 15m
    • 11:15 12:50
      Heavy Ions / Lattice QCD Plenary 3

      Plenary 3

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 11:20
        Recent Results from Heavy Ion Collisions at the LHC 30m
        Speaker: Prof. Johanna Stachel (Ruprecht-Karls-Universitaet Heidelberg (DE))
        Slides
      • 11:50
        Heavy Ion Theory 30m
        Speaker: Dr Carlos Albert Salgado Lopez (Universidade de Santiago de Compostela (ES))
        Slides
      • 12:20
        Progress in Lattice QCD 30m
        Speaker: Dr James Zanotti (University of Adelaide (AU))
        Slides
    • 12:50 14:10
      Lunch Break 1h 20m
    • 14:10 15:20
      IUPAP Prize Winners / CKM Plenary 3

      Plenary 3

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 14:10
        Semileptonic B(s) Decays 20m
        Speaker: Dr Phillip Urquijo (Universitaet Bonn (DE))
        Slides
      • 14:30
        Tests of Lorentz and CPT violation with neutrinos. 20m
        Speaker: Dr Teppei Katori (Massachusetts Institute of Technology (US))
        Slides
      • 14:50
        CP Violation/CKM Measurements 30m
        Speaker: Prof. Mikihiko Nakao (KEK IPNS (JP))
        Slides
    • 15:20 15:40
      Refreshment Break 20m
    • 15:40 17:40
      BSM / Spectroscopy / IUPAP-C11 Report Plenary 3

      Plenary 3

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 15:40
        BSM Searches 30m
        Speaker: Dr Steven Worm (CERN (CH))
        Slides
      • 16:10
        Beyond the SM: theoretical status 30m
        Speaker: Dr Bogdan Dobrescu (FNAL)
        Slides
      • 16:40
        Spectroscopy Update 30m
        Speaker: Dr Roman Mizuk (Inst. f. Theor. and Exp. Physics (RU))
        Slides
      • 17:10
        IUPAP-C11 Report 30m
        Speakers: Prof. Hiroaki Aihara Aihara (University of Tokyo), Dr Pier Oddone (Ferme National Accelerator Laboratory (US))
        Slides
    • 20:00 21:30
      Public Lecture The Spot (198 Berkeley Street, University of Melbourne)

      The Spot

      198 Berkeley Street, University of Melbourne

    • 09:00 10:30
      Neutrinos Plenary 3

      Plenary 3

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 09:00
        Long Baseline Neutrinos 30m
        Speaker: Prof. Takashi Kobayashi (KEK (JP))
        Slides
      • 09:30
        Reactor Neutrino Results 30m
        Speaker: Prof. Jun Cao (IHEP (CN))
        Slides
      • 10:00
        Neutrinos Theory Review 30m
        Speaker: Prof. Concepcion Gonzalez-Garcia (YITP-Stony Brook & ICREA-Barcelona (ES))
        Slides
    • 10:30 10:50
      Refreshment Break 20m
    • 10:50 12:50
      Cosmology / Theory Developments Plenary 3

      Plenary 3

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 10:50
        DM Direct Searches 30m
        Speaker: Dr lauren hsu (Fermilab)
        Slides
      • 11:20
        Dark Matter and New Physics 30m
        Speaker: Prof. Neal Weiner (New York University (US))
        Slides
      • 11:50
        Dark Energy and Cosmology 30m
        Speaker: Prof. Mark Trodden (University of Pennsylvania)
        Slides
      • 12:20
        New Directions in Scattering Theory 30m
        Speaker: Prof. LANCE Dixon (SLAC National Accelerator Laboratory (US))
        Slides
    • 12:50 14:30
      Lunch Break 1h 40m
    • 14:30 16:00
      Physics Highlights / Detectors & Computing
      • 14:30
        Progress in HEP Computing 30m
        Speaker: Dr Ian Fisk (Fermi National Accelerator Lab. (US))
        Slides
      • 15:00
        ICHEP2012 Physics Highlights 1h
        Speaker: Prof. Riccardo Barbieri (Scuola Normale Superiore & INFN (IT))
        Slides
    • 16:00 16:20
      Refreshment Break 20m
    • 16:20 17:05
      Future / Close Plenary 3

      Plenary 3

      Melbourne Convention and Exhibition Centre

      Melbourne Australia
      • 16:20
        Closing Talk / Future Machines / Outlook 45m
        Speaker: Prof. Rolf Heuer (CERN (CH))
        Slides