Mr
Florian Bernlochner
(University of Victoria (CA))
05/07/2012, 09:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Mr
Frederic Derue
(CNRS IN2P3 UPMC LPNHE (FR))
05/07/2012, 09:00
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.
Mr
Zhiqing Philippe Zhang
(Laboratoire de l'Accรฉlรฉrateur Linรฉaire (FR))
05/07/2012, 09:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
The inclusive eยฑp 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 โs = 319 GeV with a total integrated luminosity of 329.1 pbโ1 shared between two lepton beam charges and two longitudinal lepton polarisation modes. The differential cross sections are measured in...
Mr
Davide Pagani
(Max-Planck-Institut fรผr Physik (DE))
05/07/2012, 09:00
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Prof.
Lance Dixon
(SLAC National Accelerator Laboratory (US))
05/07/2012, 09:00
Track 12. Formal Theory Developments
Parallel Sessions
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...
Dr
Bela Majorovits
(Max-Planck-Institut fรผr Physik (DE))
05/07/2012, 09:00
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...
Prof.
Ronald Poling
(University of Minnesota (US))
05/07/2012, 09:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Peter Marquard
(KIT (DE))
05/07/2012, 09:15
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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.
05/07/2012, 09:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Sergio Di Domizio
(University of Genoa & INFN (IT))
05/07/2012, 09:15
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...
Dr
Ana Rodriguez Marrero
(Universidad de Cantabria (ES))
05/07/2012, 09:15
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...
Dr
David Kosower
(CEA - Centre d'Etudes de Saclay (FR))
05/07/2012, 09:20
Track 12. Formal Theory Developments
Parallel Sessions
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 ...
Dr
Taylor Childers
(CERN (CH))
05/07/2012, 09:30
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.
Dr
Ringaile Placakyte
(DESY (DE))
05/07/2012, 09:30
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Mr
Moritz Backes
(Universite de Geneve (CH))
05/07/2012, 09:30
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Dr
Cristina Biino
(Universita e INFN (IT))
05/07/2012, 09:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Peter C. Rowson
(SLAC (US))
05/07/2012, 09:30
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...
Prof.
L.C. Rohana Wijewardhana
(University of Cincinnati (US))
05/07/2012, 09:40
Track 12. Formal Theory Developments
Parallel Sessions
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...
Dr
Maria Aldaya Martin
(Deutsches Elektronen-Synchrotron (DE))
05/07/2012, 09:45
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...
Prof.
Karol Lang
(University of Texas at Austin (US))
05/07/2012, 09:45
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...
Dr
Guglielmo De Nardo
(Napoli University and INFN (IT))
05/07/2012, 09:45
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...
Prof.
M. Beatriz Gay Ducati
(Universidade Federal do Rio Grande do Sul (BR))
05/07/2012, 09:45
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Seema Sharma
(Fermi National Accelerator Lab. (US))
05/07/2012, 09:45
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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".
Mr
Matteo Corbo
(Fermi National Accelerator Laboratory (US))
05/07/2012, 10:00
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...
Dr
Doyoun Kim
(Monash University (AU))
05/07/2012, 10:00
Track 12. Formal Theory Developments
Parallel Sessions
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...
Mr
Youngmin Yook
(Yonsei University)
05/07/2012, 10:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Abilio De Freitas
(DESY Zeuthen (DE))
05/07/2012, 10:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Satoru Yamada
(Tohoku University (JP))
05/07/2012, 10:00
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...
Prof.
Kajari Mazumdar
(Tata Institute of Fundamental Research)
05/07/2012, 10:00
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Prof.
Abner Soffer
(Tel Aviv University (IL))
05/07/2012, 10:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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-->etaโ l nubar, and B-->omega l nubar as a function of...
Dr
Peter Marquard
(KIT (DE))
05/07/2012, 10:15
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,...
Prof.
Claudia Beatriz Glasman Kuguel
(Universidad Autonoma de Madrid (ES))
05/07/2012, 10:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Pablo Martinez Ruiz Del Arbol
(Eidgenoessische Tech. Hochschule Zuerich (CH))
05/07/2012, 10:15
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Dr
Anthony Hartin
(DESY (DE))
05/07/2012, 10:15
Track 12. Formal Theory Developments
Parallel Sessions
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...
Dr
Volker Hannen
(University of Mรผnster (DE))
05/07/2012, 10:15
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...
Mr
Christian Oswald
(Universitรคt Bonn)
05/07/2012, 10:30
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...
Dr
Pau Novella Garijo
(CIEMAT (ES))
05/07/2012, 11:00
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...
Prof.
Bennie Ward
(Baylor University (US))
05/07/2012, 11:00
Track 12. Formal Theory Developments
Parallel Sessions
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...
Prof.
Michael Strauss
(University of Oklahoma (US))
05/07/2012, 11:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Prof.
Christian Schwanenberger
(University of Manchester)
05/07/2012, 11:00
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...
Dr
James Alexander Kraus
(Michigan State University (US))
05/07/2012, 11:00
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Dr
Wei Wang
(DESY (DE))
05/07/2012, 11:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Liangjian Wen
(Institute of High Energy Physics (CN))
05/07/2012, 11:15
The neutrino mixing angle ฮธ13 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 ฮธ13, with the design sensitivity better than 0.01 in sin^22ฮธ13 at the 90% C.L. The experiment takes a near-far relative measurement by comparing the observed electron-antineutrino...
Mr
Philipp Sturm
(Bergische Universitรคt Wuppertal (DE))
05/07/2012, 11:15
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.
Dr
Daniel Fernandez-Fraile
(Frankfurt University (DE))
05/07/2012, 11:15
Track 12. Formal Theory Developments
Parallel Sessions
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...
Dr
Martin John White
(University of Melbourne (AU))
05/07/2012, 11:15
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Dr
Claus Buszello
(Uppsala University)
05/07/2012, 11:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Konstantinos Vellidis
(Fermi National Accelerator Laboratory (US))
05/07/2012, 11:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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....
Dr
Jonathan Anderson
(Universitรคt Zรผrich (CH))
05/07/2012, 11:30
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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.
Dr
Giles Barr
(Oxford University (UK))
05/07/2012, 11:30
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....
Prof.
Luc Marleau
(Universitรฉ Laval (CA))
05/07/2012, 11:30
Track 12. Formal Theory Developments
Parallel Sessions
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...
Dr
Igor Gorelov
(University of New Mexico (US))
05/07/2012, 11:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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.
Dr
Altan Cakir
(Deutsches Elektronen-Synchrotron (DE))
05/07/2012, 11:30
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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.
Dr
Gabriele Benelli
(University of Kansas (US))
05/07/2012, 11:30
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...
Prof.
Pierre-Hugues Beauchemin
(Tufts University (US))
05/07/2012, 11:45
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Donatello Dolce
(University of Melbourne (AU))
05/07/2012, 11:45
Track 12. Formal Theory Developments
Parallel Sessions
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...
Dr
Konstantin Toms
(University of New Mexico (US))
05/07/2012, 11:45
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.
Dr
Yvonne Peters
(University of Gรถttingen & DESY (DE))
05/07/2012, 11:45
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...
Dr
Ken Sakashita
(KEK (JP))
05/07/2012, 11:45
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...
Mr
Steffen Schaepe
(Universitรคt Bonn (DE))
05/07/2012, 11:45
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Prof.
Gopinath Kamath
(Indian Institute of Technology-Madras (IN))
05/07/2012, 12:00
Track 12. Formal Theory Developments
Parallel Sessions
The Antonsen โ 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...
Dr
Piergiulio Lenzi
(CERN)
05/07/2012, 12:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Ms
Melody Ravonel
(University of Geneva (CH))
05/07/2012, 12:00
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...
Dr
Giuseppe Salamanna
(University of London (UK))
05/07/2012, 12:00
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...
488.
Search for Z+photon events with Large Missing Transverse Energy in ppbar Collisions at 1.96 TeV
Dr
James Alexander Kraus
(Michigan State University (US))
05/07/2012, 12:00
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Keith Ulmer
(University of Colorado at Boulder (US))
05/07/2012, 12:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Mr
Raphael Mรคrki
(Ecole Polytechnique Federale de Lausanne (CH))
05/07/2012, 12:15
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 ฮb* baryons and measurements of the properties of ฮb and ฮฉb baryons. In addition we will present results on the production and properties of...
Dr
Glenn Lopez
(Stony Brook University (US))
05/07/2012, 12:15
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...
Dr
Hartmut Stadie
(Hamburg University (DE))
05/07/2012, 12:15
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...
Dr
Svetlana Barkanova
(Acadia University (CA))
05/07/2012, 12:15
Track 12. Formal Theory Developments
Poster Sessions
High-precision electroweak experiments such as parity-violating Mรธller 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...
Dr
Maarten Boonekamp
(CEA - Centre d'Etudes de Saclay (FR))
05/07/2012, 12:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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.
Prof.
Mike Hildreth
(University of Notre Dame (US))
05/07/2012, 12:15
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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.
Mr
Gerrit Van Onsem
(Vrije Universiteit Brussel (BE))
05/07/2012, 12:30
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...
Mr
Rick Snider
(Fermi National Accelerator Laboratory (US))
05/07/2012, 12:30
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...
Dr
Will Reece
(CERN (CH))
05/07/2012, 12:30
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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.
Dr
Matthew Barrett
(University of Hawai'i at Manoa)
05/07/2012, 13:45
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Walter Bonivento
(INFN Cagliari (IT))
05/07/2012, 14:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
Flavour-changing neutral current decays such as c -> u l+ lโ are highly suppressed in the Standard Model (SM), but may be enhanced by New Physics. For D0 -> ฮผ+ ฮผโ, 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+ -> ฯ+ ฮผ+ ฮผโ, measuring the differential branching ratio as a function of...
Mr
Christopher Rogan
(California Institute of Technology (US))
05/07/2012, 14:00
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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.
05/07/2012, 14:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Heather Ray
(University of Florida (US))
05/07/2012, 14:00
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...
Prof.
Yuri Shirman
(University of California-Irvine (US))
05/07/2012, 14:00
Track 12. Formal Theory Developments
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.
Dr
Hyun Su Lee
(Ewha Womans University)
05/07/2012, 14:00
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...
Dr
Xavier Prudent
(Technische Universitรคt Dresden)
05/07/2012, 14:15
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Dr
Oleg Brandt
(University of Gรถttingen (DE))
05/07/2012, 14:15
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...
Prof.
Richard Hill
(University of Chicago (US))
05/07/2012, 14:15
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...
Prof.
Shan Jin
(Institute of High Energy Physics)
05/07/2012, 14:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Prof.
Ahmed Ali
(DESY (DE))
05/07/2012, 14:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Dario Francia
(Centro E. Fermi and Scuola Normale Superiore (IT))
05/07/2012, 14:20
Track 12. Formal Theory Developments
Parallel Sessions
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...
Mr
Bertrand Chapleau
(McGill University (CA))
05/07/2012, 14:30
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Romulus Godang
(University of South Alabama (US))
05/07/2012, 14:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Albert De Roeck
(CERN (CH))
05/07/2012, 14:30
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Dr
Frederic Deliot
(CEA - Centre d'Etudes de Saclay (FR))
05/07/2012, 14:30
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...
Prof.
Mitchell Soderberg
(Syracuse University (US))
05/07/2012, 14:30
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...
Prof.
Bennie Ward
(Baylor University (US))
05/07/2012, 14:40
Track 12. Formal Theory Developments
Parallel Sessions
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...
Prof.
Dmitry Kazakov
(JINR (RU))
05/07/2012, 14:45
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Mr
Sanmay Ganguly
(Tata Institute of Fundamental Research)
05/07/2012, 14:45
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Prof.
Maximiliano Sioli
(INFN (IT))
05/07/2012, 14:45
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...
Mr
Korneliy Todyshev
(Budker Institute of Nuclear Physics (RU))
05/07/2012, 14:45
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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....
Dr
Marcel Vos
(Universidad de Valencia (ES))
05/07/2012, 14:45
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...
Prof.
Rosy Teh
(Universiti Sains Malaysia (MY))
05/07/2012, 14:55
Track 12. Formal Theory Developments
Parallel Sessions
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...
Dr
Valentina Santoro
(INFN Ferrara (IT))
05/07/2012, 15:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Nazila Mahmoudi
(CERN (CH) & Clermont Ferrand University (FR))
05/07/2012, 15:00
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Prof.
Maximiliano Sioli
(INFN (IT))
05/07/2012, 15:00
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...
Dr
Anastasia Grebenyuk
(DESY (DE))
05/07/2012, 15:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Aleksandrs Aleksejevs
(Memorial University of Newfoundland (CA))
05/07/2012, 15:10
Track 12. Formal Theory Developments
Parallel Sessions
Compton scattering offers a unique opportunity to study the dynamical structure of hadrons over a wide kinematic range, with polarizabilities characterizing the hadronโs 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...
Dr
Bruce Yabsley
(University of Sydney (AU))
05/07/2012, 15:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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\,...
Dr
Jong Soo Kim
(University of Adelaide (AU))
05/07/2012, 15:15
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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 regionย at the Large Hadron Collider (LHC).ย 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...
Dr
Suharyo Sumowidagdo
(University of California Riverside (US))
05/07/2012, 15:15
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...
Dr
Marilisa De Serio
(INFN (IT))
05/07/2012, 15:15
The OPERA neutrino detector built in the underground Gran Sasso Laboratory is designed to detect muon-neutrino to tau-neutrino oscillations in direct appearance mode. The hybrid apparatus consists of an emulsion/lead target complemented by electronic detectors. It is placed in the long-baseline CERN to Gran Sasso neutrino beam (CNGS) 730 km away from the source.
The running of the experiment...
Prof.
Richard Dryden Field
(University of Florida (US))
05/07/2012, 15:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Silvestro Di Luise
(ETH-Zurich Institute for Particle Physics (CH))
05/07/2012, 15:30
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...
Dr
Hideyuki Nakazawa
(National Central University)
05/07/2012, 15:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Prof.
Leif Ingvar Lรถnnblad
(Lund University (SE))
05/07/2012, 16:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Prof.
Nikolaos Kidonakis
(Kennesaw State University (US))
05/07/2012, 16:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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.
Mr
Tobias Kruker
(Universitรคt Bern (CH))
05/07/2012, 16:00
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Dr
Yvonne Peters
(University of Gรถttingen & DESY)
05/07/2012, 16:00
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...
Dr
Jonathan Paley
(Argonne National Laboratory (US))
05/07/2012, 16:00
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...
Dr
Satoshi Mishima
(INFN Rome (IT))
05/07/2012, 16:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Ms
Giulia Casarosa
(SLAC & INFN (IT))
05/07/2012, 16:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
๏ง 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...
Prof.
Christian Schwanenberger
(University of Manchester (UK))
05/07/2012, 16:15
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...
Dr
David Kosower
(CEA - Centre d'Etudes de Saclay (FR))
05/07/2012, 16:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Aoife Bharucha
(University of Hamburg (DE))
05/07/2012, 16:15
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Prof.
Ashutosh Kotwal
(Duke University (US))
05/07/2012, 16:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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 โ eฮฝ candidates and 624708 W โ ฮผฮฝ candidates, we measure mW = 80387ยฑ19 MeV. This is the most precise measurement of mW, more precise than all previous...
Dr
Hiroyuki Sekiya
(Kamioka Observatory ICRR University of Tokyo)
05/07/2012, 16:15
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...
Prof.
Erich Ward Varnes
(University of Arizona (US))
05/07/2012, 16:30
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 โ 5.4 fbโ1 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)...
Prof.
Kenneth Long
(Imperial College London (UK))
05/07/2012, 16:30
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...
Prof.
Bennie Ward
(Baylor University (US))
05/07/2012, 16:30
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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.
Dr
Jan Stark
(Laboratoire de Physique Subatomique et de Cosmologie)
05/07/2012, 16:30
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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,...
Mr
Diego Tonelli
(CERN (CH))
05/07/2012, 16:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Jenny List
(DESY (DE))
05/07/2012, 16:30
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Dr
Taikan Suehara
(The University of Tokyo (JP))
05/07/2012, 16:45
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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,...
Mr
Suprabh Prakash
(Indian Institute of Technology - Bombay (IN))
05/07/2012, 16:45
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...
Dr
Robert Ciesielski
(Rockefeller University (US))
05/07/2012, 16:45
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Sarah Marie Demers
(Yale University (US))
05/07/2012, 16:45
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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.
Dr
Antonio Limosani
(University of Melbourne (AU))
05/07/2012, 16:45
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.
Dr
Jordi Garra Tico
(University of Cambridge (UK))
05/07/2012, 16:45
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
LHCb collected 1.0 fbโ1 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.
Dr
Marek Schoenherr
(University of Durham (UK))
05/07/2012, 17:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Mr
Byeong Rok Ko
(Korea University (KR))
05/07/2012, 17:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Ms
Yvonne Kรผssel
(RWTH-Aachen (DE))
05/07/2012, 17:00
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...
Mr
Daniel Joseph Pomeroy
(Brandeis University (US))
05/07/2012, 17:00
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Mr
Masaki Ishitsuka
(Tokyo Institute of Technology)
05/07/2012, 17:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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,...
Prof.
Stefan Antusch
(University of Basel (CH))
05/07/2012, 17:00
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...
Mr
Tao Peng
(University of Science & Technology of China)
05/07/2012, 17:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Katarzyna Wichmann
(DESY)
05/07/2012, 17:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Prof.
Kaladi S. Babu
(Oklahoma State University (US))
05/07/2012, 17:15
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...
Prof.
Lance Dixon
(SLAC National Accelerator Laboratory (US))
05/07/2012, 17:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Gerhard Immanuel Brandt
(University of Oxford (UK))
05/07/2012, 17:15
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
A search for squarks in Rยparity violating supersymmetry is performed in e^\pm p collisions at HERA using the H1 detector. The full data sample taken at a centre-ยofย-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...
Dr
Youngdo Oh
(Kyungpook National University (KR))
05/07/2012, 17:15
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...
Dr
Amarjit Soni
(Brookhaven National Laboratory (US))
05/07/2012, 17:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Maciej Rybczynski
(Jan Kochanowski University (PL))
05/07/2012, 17:30
Track 9. Heavy Ion Collisions
Parallel Sessions
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....
Prof.
Paul Fraser Harrison
(University of Warwick (UK))
05/07/2012, 17:30
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...
Prof.
Tommy Ohlsson
(KTH Royal Institute of Technology (SE))
05/07/2012, 17:45
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...
Dr
Kendall Reeves
(University of Texas at Dallas (US))
06/07/2012, 09:00
Track 13. Detectors and Computing for HEP
Parallel Sessions
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,...
Dr
Mario Giordani
(INFN Trieste (IT))
06/07/2012, 09:00
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...
Prof.
Max Klein
(University of Liverpool (UK))
06/07/2012, 09:00
Track 9. Heavy Ion Collisions
Parallel Sessions
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. ย 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...
Prof.
Xerxes Tata
(University of Hawaii (US))
06/07/2012, 09:00
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Prof.
Michael Roney
(University of Victoria (CA))
06/07/2012, 09:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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....
Dr
Juan de Dios Zornoza
(IFIC (ES))
06/07/2012, 09:00
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...
Ms
Pearl Sandick
(University of Utah (US))
06/07/2012, 09:15
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Dr
Thorsten Chwalek
(KIT - Karlsruhe Institute of Technology (DE))
06/07/2012, 09:15
Track 4 - Top Quark Physics
Parallel Sessions
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...
Prof.
Erez Etzion
(Tel Aviv University (IL) & CERN (CH))
06/07/2012, 09:15
Track 9. Heavy Ion Collisions
Parallel Sessions
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...
Dr
Ignasi Rosell
(Universidad CEU Cardenal Herrera and IFIC (ES))
06/07/2012, 09:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Erik Butz
(Massachusetts Inst. of Technology (US))
06/07/2012, 09:15
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Yoshinari Hayato
(Kamioka observatory ICRR University of Tokyo (JP))
06/07/2012, 09:15
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....
Dr
Chris Hays
(University of Oxford (UK))
06/07/2012, 09:30
Track 4 - Top Quark Physics
Parallel Sessions
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...
Dr
Scott Yost
(The Citadel (US))
06/07/2012, 09:30
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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,...
Prof.
Kaladi S. Babu
(Oklahoma State University (US))
06/07/2012, 09:30
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Dr
Jean-Philippe Lansberg
(Institut de Physique Nuclรฉaire 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)
06/07/2012, 09:30
Track 9. Heavy Ion Collisions
Parallel Sessions
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...
Dr
Carlos Solans Sanchez
(Universidad de Valencia (ES))
06/07/2012, 09:30
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Yano Takatomi
(Okayama University (JP))
06/07/2012, 09:30
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...
Dr
Michael Schmidt
(University of Melbourne (AU))
06/07/2012, 09:45
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Dr
Alexander Josef Grohsjean
(DESY (DE) & Centre d'Etudes de Saclay (FR))
06/07/2012, 09:45
Track 4 - Top Quark Physics
Parallel Sessions
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...
Dr
Riccardo Paramatti
(INFN - Rome I (IT))
06/07/2012, 09:45
Track 13. Detectors and Computing for HEP
Parallel Sessions
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)...
Dr
Yusuke Koshio
(Kamioka observatory ICRR University of Tokyo (JP))
06/07/2012, 09:45
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...
Dr
Andrea Dainese
(INFN Padova (IT))
06/07/2012, 09:45
Track 9. Heavy Ion Collisions
Parallel Sessions
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,...
Dr
Anna Kropivnitskaya
(University of Florida (US))
06/07/2012, 09:45
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Joshua Moss
(Ohio State University (US))
06/07/2012, 10:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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.
Mr
Eric Torrence
(University of Oregon (US))
06/07/2012, 10:00
Track 13. Detectors and Computing for HEP
Parallel Sessions
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. ย 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. ย These detectors...
Dr
Livia Ludhova
(INFN Milano (IT))
06/07/2012, 10:00
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...
Dr
Nuno Viegas Guerreiro Leonardo
(Purdue University (US))
06/07/2012, 10:00
Track 9. Heavy Ion Collisions
Parallel Sessions
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...
Dr
Thomas Rizzo
(SLAC (US))
06/07/2012, 10:00
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Prof.
Kaladi S. Babu
(Oklahoma State University (US))
06/07/2012, 10:00
Track 4 - Top Quark Physics
Parallel Sessions
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...
Dr
Sudhir Kumar Gupta
(Monash University (AU))
06/07/2012, 10:15
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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.
Prof.
Zhengguo Zhao
(Univ. of Science & Tech. of China (CN))
06/07/2012, 10:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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.
Dr
David Krofcheck
(University of Auckland (NZ))
06/07/2012, 10:15
Track 9. Heavy Ion Collisions
Parallel Sessions
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...
Mr
Nathaniel Jay Odell
(Northwestern University (US))
06/07/2012, 10:15
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Jelena Maricic
(Drexel University (US))
06/07/2012, 10:15
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...
Prof.
Marko Mikuz
(University of Ljubljana, Jozef Stefan Institute (SI))
06/07/2012, 10:30
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Sudhir Kumar Gupta
(Monash University (AU))
06/07/2012, 11:00
Track 4 - Top Quark Physics
Parallel Sessions
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 ยฑ 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...
Dr
David Salek
(CERN (CH))
06/07/2012, 11:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Prof.
Keisho Hidaka
(Tokyo Gakugei University (JP))
06/07/2012, 11:00
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Prof.
Ehud Duchovni
(Weizmann Institute of Science (IL))
06/07/2012, 11:00
Track 9. Heavy Ion Collisions
Parallel Sessions
This talk will present the results of the azimuthal anisotropy of charged particle production and two particle correlations ย 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...
Dr
Gabriella Pugliese
(Universita e INFN & Politecnico di Bari (IT))
06/07/2012, 11:00
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Syue-Wei Li
(National Central University (TW))
06/07/2012, 11:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Richard Polifka
(Charles University in Prague (CZ) & University of Toronto (CA))
06/07/2012, 11:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
The cross section of diffractive deep-inelastic scattering ep โ 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...
Prof.
Leif Ingvar Lรถnnblad
(Lund University (SE))
06/07/2012, 11:15
Track 9. Heavy Ion Collisions
Parallel Sessions
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...
Prof.
Jacob Wacker
(SLAC (US))
06/07/2012, 11:15
Track 2 - Beyond the Standard Model - SUSY
Parallel Sessions
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...
Prof.
Heidi Schellman
(Northwestern University)
06/07/2012, 11:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Barbara Alvarez Gonzalez
(Michigan State University (US))
06/07/2012, 11:15
Track 4 - Top Quark Physics
Parallel Sessions
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 Wโ boson production in the single top quark s-channel is also given.
Dr
Mansoora Shamim
(University of Oregon (US))
06/07/2012, 11:15
Track 13. Detectors and Computing for HEP
Parallel Sessions
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 โpile-upโ, with...
Dr
Roberto Castello
(Universite Catholique de Louvain (BE))
06/07/2012, 11:30
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Tobias Kasprzik
(KIT (DE))
06/07/2012, 11:30
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Markus Cristinziani
(Universitaet Bonn (DE) & CERN)
06/07/2012, 11:30
Track 4 - Top Quark Physics
Parallel Sessions
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...
Prof.
Vladislav Simak
(Czech Technical University Prague (CZ))
06/07/2012, 11:30
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Ms
Francesca Bellini
(Universita e INFN & University of Bologna (IT))
06/07/2012, 11:30
Track 9. Heavy Ion Collisions
Parallel Sessions
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...
Dr
Andrew Haas
(New York University)
06/07/2012, 11:30
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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...
Dr
Sandra Padula
(UNESP - Universidade Estadual Paulista (BR))
06/07/2012, 11:45
Track 9. Heavy Ion Collisions
Parallel Sessions
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...
Mr
Gilvan Augusto Alves
(Centro Brasileiro de Pesquisas Fรญsicas (BR))
06/07/2012, 11:45
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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.
Prof.
Yuri Gershtein
(Rutgers University (US))
06/07/2012, 11:45
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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...
Dr
Yuan Chao
(National Taiwan University (TW))
06/07/2012, 11:45
Track 4 - Top Quark Physics
Parallel Sessions
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 lฮฝb 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...
Dr
Mark James Tibbetts
(Lawrence Berkeley National Laboratory (US))
06/07/2012, 11:45
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Mr
Kalanand Mishra
(Fermi National Accelerator Lab. (US))
06/07/2012, 11:45
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Ms
Anitha Nyatha
(Indian Institute of Technology Bombay (IN))
06/07/2012, 12:00
Track 9. Heavy Ion Collisions
Parallel Sessions
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...
Dr
Chris Hays
(University of Oxford (GB))
06/07/2012, 12:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Mr
Tim Martin
(University of Birmingham (GB))
06/07/2012, 12:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Prof.
German Valencia
(Iowa State University (US))
06/07/2012, 12:00
Track 4 - Top Quark Physics
Parallel Sessions
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...
Mr
Joram Berger
(KIT (DE))
06/07/2012, 12:00
Track 13. Detectors and Computing for HEP
Parallel Sessions
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, ฮณ+jet and Z+jet events. The results are presented for the "Particle Flow" approach, which attempts to...
Dr
Fedor Ratnikov
(KIT (DE))
06/07/2012, 12:00
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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...
Mr
Carlos Eugenio Perez Lara
(NIKHEF (NL))
06/07/2012, 12:15
Track 9. Heavy Ion Collisions
Parallel Sessions
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...
Mr
Gregorio Bernardi
(LPNHE University of Paris (FR))
06/07/2012, 12:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Hubert Niewiadomski
(CERN (CH))
06/07/2012, 12:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
The TOTEM experiment recently measured the elastic proton rates dN/dt down to โt=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...
Prof.
Ariel Gustavo Schwartzman
(SLAC National Accelerator Laboratory (US))
06/07/2012, 12:15
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Azeddine Kasmi
(Baylor University (US))
06/07/2012, 12:15
Track 4 - Top Quark Physics
Parallel Sessions
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...
Prof.
Valerie Halyo
(Princeton University (US))
06/07/2012, 12:15
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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.
Prof.
Yuri Shirman
(University of California Irvine)
06/07/2012, 12:30
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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.
Dr
Hubert Kroha
(Max-Planck-Institut fรผr Physik (DE))
06/07/2012, 12:30
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Prof.
Vladimir Kekelidze
(Joint Institute for Nuclear Research (RU))
06/07/2012, 12:30
Track 9. Heavy Ion Collisions
Parallel Sessions
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 โsNN = 4-11 GeV (NN-equivalent) and at average luminosity of 10E27 cm-2 s-1 for Au (79+) in the collider mode (NICA collider)....
Prof.
Donald Hartill
(Cornell University (US))
06/07/2012, 12:45
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Silvestro Di Luise
(Eidgenoessische Tech. Hochschule Zรผrich (CH))
06/07/2012, 12:45
Track 9. Heavy Ion Collisions
Parallel Sessions
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...
Prof.
Paul Newman
(University of Birmingham (UK))
06/07/2012, 13:00
Track 9. Heavy Ion Collisions
Parallel Sessions
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...
Prof.
Fernando Barreiro
(Universidad Autonoma De Madrid (ES))
06/07/2012, 13:45
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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,...
Prof.
Gerald Eigen
(University of Bergen (NO))
06/07/2012, 14:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Prof.
Freya Blekman
(Inter-University Institute for High Energies (BE))
06/07/2012, 14:00
Track 4 - Top Quark Physics
Parallel Sessions
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...
Dr
Bjorn Penning
(Fermi National Accelerator Laboratory)
06/07/2012, 14:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Jim Brooke
(University of Bristol (UK))
06/07/2012, 14:00
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Mr
Merlin Davies
(Universite de Montreal (CA))
06/07/2012, 14:00
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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...
Dr
Raluca Muresan
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
06/07/2012, 14:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Lorenzo Feligioni
(Universite d'Aix - Marseille II (FR))
06/07/2012, 14:15
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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...
Mr
Florian Bernlochner
(University of Victoria (CA))
06/07/2012, 14:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Marco Trovato
(Fermi National Accelerator Laboratory (US))
06/07/2012, 14:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Robert Ciesielski
(Rockefeller University (US))
06/07/2012, 14:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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.
Dr
Marcel Vos
(Universidad de Valencia (ES))
06/07/2012, 14:15
Track 4 - Top Quark Physics
Parallel Sessions
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.
Dr
Brian Petersen
(CERN (CH))
06/07/2012, 14:20
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Mr
Javier Llorente
(Universidad Autรณnoma De Madrid (ES))
06/07/2012, 14:30
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Konstantinos Vellidis
(Fermi National Accelerator Laboratory (US))
06/07/2012, 14:30
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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.
Dr
Olivier Deschamps
(Laboratoire De Physique Corpusculaire (FR))
06/07/2012, 14:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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 -> ฯ ฮณ and the CP asymmetry in B0 -> K*0 ฮณ.
Dr
Sadia Khalil
(Kansas State University (US))
06/07/2012, 14:30
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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.
Mr
Ken Mimasu
(University of Southampton (UK))
06/07/2012, 14:30
Track 4 - Top Quark Physics
Parallel Sessions
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...
Dr
Stรฉphanie Beauceron
(Universite Claude Bernard-Lyon I (FR))
06/07/2012, 14:40
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Ms
Estefania Coluccio Leskow
(Buenos Aires University (AR))
06/07/2012, 14:45
Track 4 - Top Quark Physics
Parallel Sessions
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...
Prof.
George Wei-Shu Hou
(National Taiwan University (TW))
06/07/2012, 14:45
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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...
Dr
Peter Svoisky
(University of Oklahoma (US))
06/07/2012, 14:45
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Ms
Oksana Brovchenko
(KIT - Karlsruhe Institute of Technology (DE))
06/07/2012, 14:45
Track 5 - B-Physics
Parallel Sessions
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...
Dr
Aldo Saavedra
(University of Sydney (AU))
06/07/2012, 14:45
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Reiner Hauser
(Michigan State University (US))
06/07/2012, 14:55
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Prof.
James Olsen
(Princeton University (US))
06/07/2012, 15:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Mr
Adam Aurisano
(Texas A&M University),
Adam Aurisano
(Unknown),
Adam Jude Aurisano
06/07/2012, 15:00
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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...
Mr
Keith Ulmer
(University of Colorado at Boulder (US))
06/07/2012, 15:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Prof.
Chung Kao
(University of Oklahoma (US))
06/07/2012, 15:00
Track 4 - Top Quark Physics
Parallel Sessions
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...
Dr
Ivan Kresimir Furic
(University of Florida (US))
06/07/2012, 15:10
Track 13. Detectors and Computing for HEP
Parallel Sessions
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,...
Dr
Hiroshi Yokoya
(National Taiwan University (TW))
06/07/2012, 15:15
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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...
Prof.
Kenneth Bloom
(University of Nebraska-Lincoln (US))
06/07/2012, 15:15
Track 4 - Top Quark Physics
Parallel Sessions
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...
Dr
Avto Kharchilava
(State University of New York (US))
06/07/2012, 15:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Abraham Antonio Gallas Torreira
(Universidade de Santiago de Compostela (ES))
06/07/2012, 15:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
Rare b -> s ฮผ+ ฮผโ 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 ฮผ+ ฮผโ, B+ -> K+ ฮผ+ ฮผโ and B0s -> ฯ ฮผ+ ฮผโ. Particularly interesting are the angular and...
Dr
Mimmo Della Volpe
(Universitร "Federico II" di Napoli & INFN (IT))
06/07/2012, 15:25
Track 13. Detectors and Computing for HEP
Parallel Sessions
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....
Dr
Hideki Miyake
(KEK (JP))
06/07/2012, 15:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
Results of a CDF search for B->mumu decays and the angular analysis of B --> X_s mu+mu- decay sare presented using the complete 10/fb dataset collected by the CDF experiment. The B-> mu+mu-analysis is unchanged with respect to the last iteration and 30% more data allow to reach 95% expected upper limits for the branching ratio of4.2x10^-9 in the Bd decay and 1.3x10^-8 in the Bs decay. The...
Dr
Nazila Mahmoudi
(CERN (CH) & Clermont Ferrand University (FR))
06/07/2012, 16:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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.
Dr
Sinead Farrington
(University of Warwick (UK))
06/07/2012, 16:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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.
Dr
Christian Veelken
(Ecole Polytechnique (FR))
06/07/2012, 16:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Marcelle Soares-Santos
(Fermi National Accelerator Laboratory (US))
06/07/2012, 16:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Prof.
Franz Muheim
(University of Edinburgh (UK))
06/07/2012, 16:00
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Hajime Nishiguchi
(KEK (JP))
06/07/2012, 16:00
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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...
Dr
Signe Riemer-Sorensen
(University of Queensland)
06/07/2012, 16:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Dr
Alessandro Bertolin
(INFN Padova (IT))
06/07/2012, 16:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Prof.
Vladimir Kekelidze
(Joint Inst. for Nuclear Research (RU))
06/07/2012, 16:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Prof.
Kiyoshi Hayasaka
(Nagoya University (JP))
06/07/2012, 16:15
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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.
Mr
Sascha Ulrich Thoma
(Albert-Ludwigs-Universitรคt Freiburg (DE))
06/07/2012, 16:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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%...
Dr
Markus Elsing
(CERN (CH))
06/07/2012, 16:20
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Michel Sauter
(Universitรคt Heidelberg (DE))
06/07/2012, 16:30
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Prof.
Chun-Khiang Chua
(Chung Yuan Christian University (TW))
06/07/2012, 16:30
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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,...
Prof.
Mike Hildreth
(University of Notre Dame (US))
06/07/2012, 16:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Prof.
Kwang-Chang Lai
(Chang Gung University (TW))
06/07/2012, 16:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Dr
Matteo Sani
(University of California (US))
06/07/2012, 16:30
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Prof.
Jeremy Mans
(University of Minnesota (US))
06/07/2012, 16:35
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Prof.
Carl Albright
(Northern Illinois University & Fermi National Accelerator Laboratory (US))
06/07/2012, 16:45
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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...
Dr
Simon Marie E De Visscher
(Universitรคt Zรผrich (CH))
06/07/2012, 16:45
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Mr
Matthias Danninger
(Stockholm University (SE))
06/07/2012, 16:45
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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....
Dr
Steven Robertson
(McGill University (CA))
06/07/2012, 16:45
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Prof.
Paoti Chang
(National Taiwan University (TW))
06/07/2012, 16:45
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Mario Giordani
(INFN Trieste (IT))
06/07/2012, 16:50
Track 13. Detectors and Computing for HEP
Parallel Sessions
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,...
Dr
Juan de Dios Zornoza Gomez
(IFIC (ES))
06/07/2012, 17:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Dr
James Catmore
(CERN (CH))
06/07/2012, 17:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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
Dr
Paolo Iengo
(INFN (IT))
06/07/2012, 17:00
Track 5 - B-Physics
Parallel Sessions
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.
Dr
David South
(DESY (DE))
06/07/2012, 17:00
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
A search for second and third generation scalar and vector leptoquarks produced in ep collisions via the lepton flavour violating processes ep โ ฮผX and ep โ \tau X is performed by the H1 experiment at HERA. The full data sample taken at a centre-of-mass energy โs = 319 GeV is used for the analysis, corresponding to an integrated luminosity of 245 pbโ1 of e+p and 166 pbโ1 of eโp collision data....
Prof.
Yury Kolomensky
(UC Berkeley & LBNL (US))
06/07/2012, 17:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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 BABARโs large data sets of (92.8 +- 0.8) million Upsilon(2S) and (116.8 +- 1.0) million Upsilon(3S) decays to identify...
Mr
Ferdinando Giordano
(University of California Riverside (US))
06/07/2012, 17:05
Track 13. Detectors and Computing for HEP
Parallel Sessions
The present CMS pixel detector was designed for a maximum luminosity of 1ร1034 cmโ2sโ1. Following the Phase 1 upgrade of the LHC, the peak luminosity is foreseen to reach 2ร1034 cmโ2sโ1. 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...
Dr
Achim Geiser
(DESY)
06/07/2012, 17:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
DOYOUN Kim
(Monash University)
06/07/2012, 17:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Mr
Mathieu Perrin-Terrin
(Centre de Physique des Particules de Marseille, Universitรฉ d'Aix-Marseille (FR))
06/07/2012, 17:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
We present a review of the searches for very rare decays to muon final states performed at LHCb using 1.0 fbโ1 of pp collisions at 7 TeV centre of mass energy. Flavour changing neutral current processes, such as B0s -> ฮผ+ ฮผโ 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...
Prof.
David Hitlin
(California Institute of Technology)
06/07/2012, 17:15
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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. ...
Prof.
Yeongduk Kim
(Sejong University (KR))
06/07/2012, 17:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Dr
Ralf Hertenberger
(Ludwig-Maximilians-Univ. Mรผnchen (DE))
06/07/2012, 17:20
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Ms
Kinga Partyka
(Yale University)
06/07/2012, 17:30
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...
Claudia Cecchi
(Universita e INFN (IT))
06/07/2012, 17:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Karen Gibson
(Case Western Reserve University (US))
06/07/2012, 17:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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 worldโs most sensitive dark matter detector, with a fiducial target mass of 100 kg. Results from a surface lab commissioning and calibration run of...
Prof.
Ahmed Ali
(DESY (DE))
06/07/2012, 17:30
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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...
Dr
Sudarshan Paramesvaran
(University of California Riverside (US))
06/07/2012, 17:35
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Prof.
Mikhail Danilov
(ITEP Institute for Theoretical and Experimental Physics (RU))
06/07/2012, 17:45
Track 5 - B-Physics
Parallel Sessions
The B factories โ the Belle detector at the KEKB collider in KEK and the BaBar detector at the PEP II in SLAC โ 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...
Dr
Jelena Maricic
(Drexel University (US))
06/07/2012, 17:45
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Dr
Else Lytken
(Lund University (SE))
06/07/2012, 17:45
Track 3 - BSM - Non-SUSY Exotics
Parallel Sessions
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.
Prof.
Kock Kiam Gan
(Ohio State University (US))
06/07/2012, 17:50
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Kalliopi Petraki
(University of Melbourne (AU))
07/07/2012, 09:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Prof.
Fabio Zwirner
(University of Padova and INFN (IT))
07/07/2012, 09:00
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.
Mr
Joshua James Swanson
(University of Wisconsin (US))
07/07/2012, 09:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Axel Maas
(Friedrich Schiller University Jena (DE))
07/07/2012, 09:00
Track 10. Lattice QCD
Parallel Sessions
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...
Prof.
Steinar Stapnes
(CERN (CH))
07/07/2012, 09:00
Track 14. Future Accelerators
Parallel Sessions
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...
Rolf Heuer
(CERN)
07/07/2012, 09:00
Prof.
Philip Burrows
(University of Oxford (UK))
07/07/2012, 09:15
Track 14. Future Accelerators
Parallel Sessions
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...
Prof.
Keisuke Juge
(University of the Pacific (US))
07/07/2012, 09:15
Track 10. Lattice QCD
Parallel Sessions
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.
Dr
Swagato Banerjee
(University of Wisconsin (US))
07/07/2012, 09:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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.
Dr
Benedict von Harling
(University of Melbourne (AU))
07/07/2012, 09:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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,...
Dr
David South
(DESY (DE))
07/07/2012, 09:20
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...
Prof.
Keith Dienes
(NSF & University of Arizona & University of Maryland (US))
07/07/2012, 09:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Ms
Marjorie Bardeen
(Fermilab Friends for Science Education (US))
07/07/2012, 09:30
Track 15. Education and Outreach
Parallel Sessions
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...
Dr
Thorsten Kurth
(Bergische Universitรคt Wuppertal (DE))
07/07/2012, 09:30
Track 10. Lattice QCD
Parallel Sessions
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...
Prof.
Paul Grannis
(Stony Brook University)
07/07/2012, 09:30
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Umberto Dosselli
(Universita e INFN (IT))
07/07/2012, 09:30
Track 14. Future Accelerators
Parallel Sessions
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...
Dr
Katarzyna Wichmann
(DESY)
07/07/2012, 09:35
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...
Dr
Brooks Thomas
(University of Hawaii (US))
07/07/2012, 09:45
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Dr
Jenny List
(DESY (DE))
07/07/2012, 09:45
Track 14. Future Accelerators
Parallel Sessions
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...
Dr
Elisabetta Pianori
(University of Warwick (UK))
07/07/2012, 09:45
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Fabio Bernardoni
(DESY (DE))
07/07/2012, 09:45
Track 10. Lattice QCD
Parallel Sessions
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...
Mr
Arnaud Marsollier
(CERN)
07/07/2012, 09:50
Track 15. Education and Outreach
Parallel Sessions
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...
Dr
Bjorn Penning
(Fermi National Accelerator Laboratory (US))
07/07/2012, 09:50
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...
Dr
Andrea Shindler
(Humboldt University (DE))
07/07/2012, 10:00
Track 10. Lattice QCD
Parallel Sessions
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...
Dr
Russell Neilson
(University of Chicago (US))
07/07/2012, 10:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Dr
Carl Bryan Gwilliam
(University of Liverpool (GB))
07/07/2012, 10:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Anthony Hartin
(DESY (DE))
07/07/2012, 10:00
Track 14. Future Accelerators
Parallel Sessions
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...
Dr
James Francis Hirschauer
(Fermi National Accelerator Laboratory (US))
07/07/2012, 10:05
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.
Prof.
Farid Ould-Saada
(Oslo University (NO))
07/07/2012, 10:10
Track 15. Education and Outreach
Parallel Sessions
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...
Dr
Grigory Trubnikov
(Joint Institute for Nuclear Research (RU))
07/07/2012, 10:15
Track 14. Future Accelerators
Parallel Sessions
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...
Dr
Hau-Bin Li
(Academia Sinica (TW))
07/07/2012, 10:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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)...
Dr
Francesco Pandolfi
(ETH Zรผrich (CH))
07/07/2012, 10:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Prof.
Soeren Andre Prell
(Iowa State University (US))
07/07/2012, 10:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Peter Wagner
(University of Pennsylvania (US))
07/07/2012, 10:20
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.
Prof.
Min-Zu Wang
(National Taiwan University (TW))
07/07/2012, 10:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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.
Dr
Jean-Philippe Lansberg
(Institut de Physique Nuclรฉaire d'Orsay / IN2P3-CNRS (FR))
07/07/2012, 10:30
Track 14. Future Accelerators
Parallel Sessions
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...
Dr
Lauren Hsu
(Fermi National Accelerator Laboratory (US))
07/07/2012, 10:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Prof.
Chung Kao
(University of Oklahoma (US))
07/07/2012, 10:35
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...
Prof.
Kwei-Chou Yang
(Chung Yuan Christian University (TW))
07/07/2012, 11:00
Track 5 - B-Physics
Parallel Sessions
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...
Dr
Ralph Steinhagen
(CERN (CH))
07/07/2012, 11:00
Track 14. Future Accelerators
Parallel Sessions
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...
Dr
Robert Foot
(University of Melbourne (AU))
07/07/2012, 11:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Dr
Xabier Anduaga Del Popolo
(Universidad Nacional de La Plata (AR))
07/07/2012, 11:00
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...
Mr
Markus Klute
(Massachusettes Institute of Technology)
07/07/2012, 11:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Mrs
Claudia Marcelloni De Oliveira
(Lawrence Berkeley National Lab. (US))
07/07/2012, 11:00
Track 15. Education and Outreach
Parallel Sessions
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...
Mr
Giovanni Zevi Della Porta
(Harvard University (US))
07/07/2012, 11:15
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...
Dr
Konstantinos Nikolopoulos
(University of Birmingham (GB))
07/07/2012, 11:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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.
Dr
Fernando Luiz Ferreira Rodrigues
(CBPF - Brazilian Center for Physics Research (BR))
07/07/2012, 11:15
Track 5 - B-Physics
Parallel Sessions
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 fbโ1 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...
Prof.
Richard Hill
(University of Chicago (US))
07/07/2012, 11:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Prof.
Max Klein
(CERN)
07/07/2012, 11:30
Track 14. Future Accelerators
Parallel Sessions
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...
Dr
Karl Kruszelnicki
(University of Sydney (AU))
07/07/2012, 11:30
Dr
Torsten Leddig
(Universitรคt Rostock (DE))
07/07/2012, 11:30
Track 5 - B-Physics
Parallel Sessions
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...
Dr
Nazila Mahmoudi
(CERN (CH) & Clermont Ferrand University (FR))
07/07/2012, 11:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Dr
Biagio Di Micco
(CERN)
07/07/2012, 11:30
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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 ...
Prof.
Simonetta Gentile
(Universita e INFN, Roma I (IT))
07/07/2012, 11:30
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...
Dr
Ho-Chin Tsai
(Chung Yuan Christian University (TW))
07/07/2012, 11:45
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Ms
T'Mir Julius
(University of Melbourne (AU))
07/07/2012, 11:45
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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 $B^0 \to \pi^0 \pi^0$...
Dr
Dag Gillberg
(Carleton University (CA))
07/07/2012, 11:45
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.
Dr
Emanuele Di Marco
(California Institute of Technology (US))
07/07/2012, 11:45
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Young-Kee Kim
(Fermi National Accelerator Laboratory (US))
07/07/2012, 11:45
Track 14. Future Accelerators
Parallel Sessions
Fermilabโs high intensity future is โProject-Xโ 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...
Mr
Galea Ahmad
(University of Melbourne (AU))
07/07/2012, 12:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Mr
Massimo Casarsa
(INFN - Trieste)
07/07/2012, 12:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Prof.
Kenneth Long
(Imperial College London (UK))
07/07/2012, 12:00
Track 14. Future Accelerators
Parallel Sessions
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...
07/07/2012, 12:00
662.
Search for new physics in events with two photons, many jets, and low missing transverse energy
Dr
Marc Gabriel Weinberg
(Florida State University (US))
07/07/2012, 12:00
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.
Prof.
Alexander Bondar
(Novosibirsk State University (RU))
07/07/2012, 12:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Prof.
Claudia Wulz
(Austrian Academy of Sciences (AT))
07/07/2012, 12:15
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.
Dr
Abid Patwa
(Brookhaven National Laboratory (BNL))
07/07/2012, 12:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Tracy Slatyer
(Institute for Advanced Study (US))
07/07/2012, 12:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Ms
Alexandra Martin Sanchez
(Universite de Paris-Sud 11 (FR))
07/07/2012, 12:15
Track 5 - B-Physics
Parallel Sessions
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...
Dr
Paul Soler Jermyn
(University of Glasgow (UK))
07/07/2012, 12:15
Track 14. Future Accelerators
Parallel Sessions
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...
Ms
Yuko Hino
(Osaka University (JP))
07/07/2012, 12:30
Track 14. Future Accelerators
Parallel Sessions
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...
Ms
Felicitas Thorne
(Institute of High Energy Physics (AT))
07/07/2012, 12:30
Track 5 - B-Physics
Parallel Sessions
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...
Dr
Andreas Hinzmann
(CERN)
07/07/2012, 12:30
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.
Prof.
Csaba Balazs
(Monash University (AU))
07/07/2012, 12:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Mr
Christian Peter Linn
(Ruprecht-Karls-Universitaet Heidelberg (DE))
07/07/2012, 12:45
Track 5 - B-Physics
Parallel Sessions
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...
Aldo Morselli
(INFN Roma Tor Vergata)
07/07/2012, 12:45
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Prof.
Kameshwar Wali
(Syracuse University (US))
07/07/2012, 13:45
Track 12. Formal Theory Developments
Parallel Sessions
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...
Prof.
Ming-Chuan Chang
(Fu Jen Catholic University (TW))
07/07/2012, 13:45
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...
Dr
David South
(DESY (DE))
07/07/2012, 13:45
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Prof.
Peter Ratoff
(Lancaster University (UK))
07/07/2012, 13:45
Track 5 - B-Physics
Parallel Sessions
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.
Dr
Domenico Del Prete
(INFN Napoli (IT))
07/07/2012, 14:00
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Prof.
Bernd Kniehl
(University of Hamburg (DE))
07/07/2012, 14:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Anna Phan
(Syracuse University (US))
07/07/2012, 14:00
Track 5 - B-Physics
Parallel Sessions
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, ฮฮs, the average width ฮs and the CP-violating phase, ฯs. We present measurements of the effective lifetimes of B0s...
Dr
Jose Bellido
(University of Adelaide (AU))
07/07/2012, 14:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Dr
David Lopes-Pegna
(Princeton University (US))
07/07/2012, 14:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
SARAH MALIK
(UNIVERSITY COLLEGE LONDON),
Sarah Malik
(Rockefeller University (US))
07/07/2012, 14:00
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...
Dr
Jean-Roch Vlimant
(CERN (CH))
07/07/2012, 14:15
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Stefania Vecchi
(INFN Ferrara)
07/07/2012, 14:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Mathias Butenschoen
(University of Hamburg (DE))
07/07/2012, 14:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Adrian Bevan
(Queen Mary University of London (UK))
07/07/2012, 14:15
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...
Dr
Giacinto Piacquadio
(CERN)
07/07/2012, 14:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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.
Prof.
Roger Clay
(University of Adelaide (AU))
07/07/2012, 14:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
The observation of ultra-high energy netrinos (UHEฯ
s) 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...
Dr
Riccardo de Sangro
(INFN Frascati (IT))
07/07/2012, 14:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Prof.
Valerie Gibson
(University of Cambridge (GB))
07/07/2012, 14:30
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Hisao Tokuno
(Tokyo Institute of Technology (JP))
07/07/2012, 14:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Dr
Satish Desai
(Fermilab)
07/07/2012, 14:30
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Ikuo Ueda
(University of Tokyo (JP))
07/07/2012, 14:30
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Mr
Sandy Law
(National Cheng Kung University (TW))
07/07/2012, 14:45
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...
Dr
Ian Fisk
(Fermi National Accelerator Lab. (US))
07/07/2012, 14:45
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Wei-Ming Yao
(Lawrence Berkeley National Laboratory (US))
07/07/2012, 14:45
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Mr
Bastian Kronenbitter
(KIT)
07/07/2012, 14:45
Track 5 - B-Physics
Parallel Sessions
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.
Mr
Valentin Knunz
(Austrian Academy of Sciences (AT))
07/07/2012, 14:45
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Paolo Camarri
(University of Roma Tor Vergata)
07/07/2012, 14:45
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Prof.
Sudhir Malik
(University of Nebraska-Lincoln (US))
07/07/2012, 15:00
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
James William Walder
(Lancaster University (GB))
07/07/2012, 15:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Archil Kobakhidze
(University of Melbourne (AU))
07/07/2012, 15:00
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
Ms
Kerstin Tackmann
(Deutsches Elektronen-Synchrotron (DE))
07/07/2012, 15:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Prof.
Marina Artuso
(Syracuse University (US))
07/07/2012, 15:00
Track 5 - B-Physics
Parallel Sessions
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 ฮผ ฮฝ 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...
Prof.
Yoshitaka Ito
(Nagoya University (JP))
07/07/2012, 15:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Mr
Mirco Dorigo
(INFN Trieste & University of Trieste (IT))
07/07/2012, 15:15
Track 5 - B-Physics
Parallel Sessions
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...
Dr
Paul Doll
(KIT (DE))
07/07/2012, 15:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
(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 mยฒ, Eยต>0.8 GeV) allows to study the angular...
Dr
Jean-Philippe Lansberg
(Institut de Physique Nuclรฉaire d'Orsay (FR))
07/07/2012, 15:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Serguei Ganjour
(CEA - Centre d'Etudes de Saclay (FR))
07/07/2012, 15:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Alessandro Polini
(DESY (DE) & CERN (CH))
07/07/2012, 15:15
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Paul Doll
(KIT (DE))
07/07/2012, 15:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
(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...
Dr
Iain Bertram
(Lancaster University)
07/07/2012, 15:30
Track 5 - B-Physics
Parallel Sessions
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...
Dr
Paul Soler Jermyn
(University of Glasgow (UK))
07/07/2012, 15:30
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Souza Santos Angelo
(LAFEX, Centro Brasieiro de Pesquisas Fiscicas (BR))
07/07/2012, 15:45
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...
Prof.
Martin Sevior
(University of Melbourne (AU))
07/07/2012, 16:00
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Azeddine Kasmi
(Baylor University (US))
07/07/2012, 16:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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,...
Dr
Sandro Palestini
(CERN (CH))
07/07/2012, 16:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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. ย Measurement of the lifetimes of the different eigenstates and the CP-violating mixing phase phi_s have been recently obtained and are presented.
Prof.
Mark Trodden
(University of Pennsylvania (US))
07/07/2012, 16:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Dr
Delia Hasch
(INFN-Frascati (IT))
07/07/2012, 16:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Alessio Bonato
(CERN)
07/07/2012, 16:00
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.
Dr
Kenneth Richard Herner
(University of Michigan (US))
07/07/2012, 16:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Mr
Callen Benjamin
(University of Melbourne (AU))
07/07/2012, 16:15
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...
Prof.
Stefan Antusch
(University of Basel (CH))
07/07/2012, 16:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Dr
Greig Cowan
(EPFL (CH))
07/07/2012, 16:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
The determination of the CP-violating phase ฯs in B0s -> J/ฯ ฯ 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 ฯs and the first observation of a non-zero ฮฮs based upon 1.0 fbโ1 of data collected at LHCb during 2011. ฯs...
Dr
Chris White
(University of Glasgow (UK))
07/07/2012, 16:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Stefan; on behalf of the DEPFET collaboration Rummel
(LMU Munich (DE))
07/07/2012, 16:15
Track 13. Detectors and Computing for HEP
Parallel Sessions
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,...
Dr
Sara Bolognesi
(Johns Hopkins University (US))
07/07/2012, 16:30
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Prof.
Sampa Bhadra
(York University)
07/07/2012, 16:30
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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)|,...
Dr
Dmitri Tsybychev
(Stony Brook University (US))
07/07/2012, 16:30
Track 5 - B-Physics
Parallel Sessions
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...
Dr
Carlo Gustavino
(INFN (IT))
07/07/2012, 16:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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,...
Prof.
Andy White
(University of Texas at Arlington (US))
07/07/2012, 16:30
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Amarjit Soni
(Brookhaven National Laboratory (US))
07/07/2012, 16:30
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, itโd 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...
Dr
Masaya Hasegawa
(KEK (JP))
07/07/2012, 16:45
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Dr
Isabella Garzia
(SLAC & INFN (IT))
07/07/2012, 16:45
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Dr
Frank Simon
(Max-Planck-Institut fรผr Physik (DE))
07/07/2012, 16:45
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Kerstin Hoepfner
(Rheinisch-Westfaelische Tech. Hoch. Aachen (DE))
07/07/2012, 16:45
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.
Dr
Jeremy Dalseno
(Max-Planck-Institut fรผr Physik)
07/07/2012, 16:45
Track 5 - B-Physics
Parallel Sessions
We present a time-dependent measurement of CP violation parameters in $B^0 \to \pi^+\pi^-$ decays.
These results are obtained from the full data sample that contains 772 million $B\overline{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy
$e^+e^-$ collider.
Dr
Tomohiko Tanabe
(ICEPP University of Tokyo (JP))
07/07/2012, 16:50
Track 13. Detectors and Computing for HEP
Parallel Sessions
The ILD detector concept is a proposal for a detector at an electron โ 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...
Dr
Masaya Hasegawa
(KEK (JP))
07/07/2012, 17:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Andreas Hafner
(M), Dr
Andreas Martin Hafner
(Mainz University (DE))
07/07/2012, 17:00
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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...
Mr
Michele (CH) Redi
(CERN)
07/07/2012, 17:00
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...
Dr
Andrew Stephen Powell
(University of Oxford (GB))
07/07/2012, 17:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Uta Klein
(University of Liverpool (UK))
07/07/2012, 17:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
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...
Dr
Frank Simon
(Max-Planck-Institut fรผr Physik (DE))
07/07/2012, 17:10
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Dr
Eli Ben Haim
(LPNHE, IN2P3-CNRS, Universities of Paris VI (FR))
07/07/2012, 17:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Hideyuki Nakazawa
(National Central University (JP))
07/07/2012, 17:15
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
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}...
Dr
Eric Charles
(SLAC (US))
07/07/2012, 17:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Eram Syed Rizvi
(Queen Mary, University of London)
07/07/2012, 17:20
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...
Dr
Paul Soler Jermyn
(University of Glasgow (GB))
07/07/2012, 17:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Tamaki Yoshioka
(Kyushu University (JP))
07/07/2012, 17:30
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Prof.
Veronica Bindi
(University of Hawaii at Manoa (US))
07/07/2012, 17:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
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...
Dr
Sascha Turczyk
(Lawrence Berkeley National Laboratory (US))
07/07/2012, 17:45
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
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...
Dr
Adam Para
(Fermi National Accelerator Laboratory (US))
07/07/2012, 17:45
Track 13. Detectors and Computing for HEP
Parallel Sessions
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...
Prof.
Mikhail Danilov
(Institute for Theoretical and Experimental Physics (RU))
07/07/2012, 18:00
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...
Dr
Nicholas Setzer
(Universidad de Granada (ES))
07/07/2012, 18:00
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.
Dr
Matthew Wingate
(University of Cambridge (UK))
07/07/2012, 18:00
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...
Dr
Yasuhiro Shimizu
(Tohoku Univ. (JP))
07/07/2012, 18:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Poster Sessions
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.
Anupam Singh
(L.N.Mittal I.I.T. (IN))
07/07/2012, 18:00
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...
Dr
Ivan Alexandrov
(ITEP (RU))
07/07/2012, 18:00
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 โamplificationโ...
Dr
Sascha Turczyk
(LBNL (US))
07/07/2012, 18:00
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...
Dr
Tobias Kasprzik
(KIT (DE))
07/07/2012, 18:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Poster Sessions
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...
Dr
Elena Kokoulina
(Joint Institute for Nuclear Research (RU))
07/07/2012, 18:00
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...
Dr
Doyoun Kim
(Monash University (AU))
07/07/2012, 18:00
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.
Ms
Olga Novgorodova
(DESY (DE))
07/07/2012, 18:00
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...
Mr
Ming-Hsun Li
(Chung Yuan Christian University (TW))
07/07/2012, 18:00
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...
Prof.
Eigen Gerald
(University of Bergen (NO))
07/07/2012, 18:00
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 $\epsilon_K$)...
Prof.
George W.-S. Hou
(National Taiwan University (TW))
07/07/2012, 18:00
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...
Dr
Sinead Farrington
(University of Oxford (UK))
07/07/2012, 18:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Poster Sessions
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
fbโ1 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 .
Prof.
Sudhir Malik
(University of Nebraska-Lincoln (US))
07/07/2012, 18:00
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...
Dr
Alessandro Bertolin
(INFN Padova)
07/07/2012, 18:00
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,...
Dr
Jason Kumar
(University of Hawaii (US))
07/07/2012, 18:00
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...
Dr
Krishna Kumar Singh
(Bits Pilani Dubai Campus (AE))
07/07/2012, 18:00
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...
. H1 Collaboration
(DESY)
07/07/2012, 18:00
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...
Dr
Glenn Lopez
(Stony Brook University (US))
07/07/2012, 18:00
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...
Dr
Salim Cerci
(Cukurova University (TR))
07/07/2012, 18:00
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 โ 150 GeV/c within pseudorapidities 3.2 < |eta| < 4.7, and central jets...
Ms
Jana Novakova
(Charles University (CZ))
07/07/2012, 18:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Poster Sessions
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 โ 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...
Ms
Agnieszka Leyko
(Universitaet Bonn (DE))
07/07/2012, 18:00
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...
Dr
Heather Ray
(University of Florida)
07/07/2012, 18:00
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.
James Alexander Kraus
(Michigan State University (US)), Dr
James Kraus
(Michigan State University)
07/07/2012, 18:00
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...
Dr
Oliver Pooth
(Rheinisch-Westfaelische Tech. Hoch. (DE))
07/07/2012, 18:00
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...
Dr
Stephen Gibson
(CERN (CH))
07/07/2012, 18:00
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...
Dr
Silvestro Di Luise
(Eidgenoessische Tech. Hochschule Zuerich (CH))
07/07/2012, 18:00
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...
Dr
Darius Jurciukonis
(Vilnius University (LT))
07/07/2012, 18:00
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...
Dr
Brian Robson
(Australian National University (AU))
07/07/2012, 18:00
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...
Mr
Kevin Daniel Finelli
(Duke University (US))
07/07/2012, 18:00
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...
Dr
Ivanka Bozovic-Jelisavcic
(Vinca Institute of Nuclear Sciences, University of Belgrade (RS))
07/07/2012, 18:00
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...
Dr
Fredy Ochoa
(Universidad Nacional de Colombia Sede Bogota (CO))
07/07/2012, 18:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Poster Sessions
In this work we study the production cross section of the heaviest charged Higgs bosons (H_2^ยฑ) 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 Zโ neutral boson predicted by the model, we calculate the cross section of H_2^ยฑ pair production in Drell-Yan processes at CERN-LHC hadron...
Dr
Jun Kameda
(ICRR, University of Tokyo (JP))
07/07/2012, 18:00
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...
Ms
Saptaparna Bhattacharya
(Brown University (US))
07/07/2012, 18:00
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...
Dr
Elisa Guido
(INFN-Genova (IT))
07/07/2012, 18:00
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...
Ms
Flavia De Almeida Dias
(UNESP - Universidade Estadual Paulista (BR))
07/07/2012, 18:00
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 โs = 7 TeV.
Ms
Agni Bethani
(DESY (DE))
07/07/2012, 18:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Poster Sessions
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...
Mr
Seyed Mohsen Etesami
(Institute f. Studies in Theoretical Physics and Mathematics (IR))
07/07/2012, 18:00
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
Dr
Adrian Perieanu
(RWTH Aachen (DE))
07/07/2012, 18:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Poster Sessions
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.
Prof.
Yoshitaka Kuno
(Osaka University (JP))
07/07/2012, 18:00
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.
Thiago Fernandez Perez Tomei
(UNESP - Universidade Estadual Paulista (BR))
07/07/2012, 18:00
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...
Dr
Katarzyna Wichmann
(DESY)
07/07/2012, 18:00
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...
Prof.
Gobinda Majumder
(Tata Inst. of Fundamental Research (IN))
07/07/2012, 18:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Poster Sessions
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...
Lara Lloret Iglesias
(Universidad de Oviedo (ES))
07/07/2012, 18:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Poster Sessions
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.
Dr
Christian Veelken
(Ecole Polytechnique (FR))
07/07/2012, 18:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Poster Sessions
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...
848.
Search for supersymmetry in events with a Z boson, jets and missing energy using the JZB method
Marco Andrea Buchmann
(Eidgenoessische Tech. Hochschule Zuerich (CH))
07/07/2012, 18:00
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...
Prof.
Kai-Feng Chen
(National Taiwan University (TW))
07/07/2012, 18:00
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.
Mr
Benjamin Farmer
(Monash University (AU))
07/07/2012, 18:00
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...
Prof.
Satyanarayan Nandi
(Oklahoma State University (US))
07/07/2012, 18:00
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...
Dr
Fernando T Brandt
(Universidade de Sรฃo Paulo)
07/07/2012, 18:00
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.
Dr
Krishna Kumar Singh
(Bits Pilani Dubai Campus (AE))
07/07/2012, 18:00
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...
Mr
Raman Khurana
(Saha Institute of Nuclear Physics (IN))
07/07/2012, 18:00
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,...
Dr
Sudhir Kumar Gupta
(Monash University (AU))
07/07/2012, 18:00
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...
Dr
Satoshi Mishima
(INFN Rome (IT))
07/07/2012, 18:00
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...
Mr
Curtis William Black
(University of Sydney (AU))
07/07/2012, 18:00
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 naรฏve 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...
Dr
Takashi Kubota
(University of Melbourne (AU))
07/07/2012, 18:00
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....
Mr
Kong Guan Tan
(University of Melbourne (AU))
07/07/2012, 18:00
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...
Cristina Biino
(Universita e INFN (IT))
07/07/2012, 18:00
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...
Dr
Chong Chung Lih
(Department of Optometry, Shu-Zen College of Medicine and Management (TW))
07/07/2012, 18:00
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 ...
Mrs
Olga Driga
(SUBATECH (FR))
07/07/2012, 18:00
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 โ 0 ). In order to test this prediction, a systematic...
09/07/2012, 09:00
Dr
Richard Hawkings
(CERN)
09/07/2012, 09:30
Prof.
Joseph Incandela
(Univ. of California Santa Barbara (US))
09/07/2012, 10:00
Dr
Shalhout Shalhout
(UCDAVIS), Dr
Shalhout Shalhout
(University of California Davis (US))
09/07/2012, 10:30
Plenary Sessions
Prof.
Thomas Muller
(KIT (DE))
09/07/2012, 11:30
Dr
Gilad Perez
(CERN (CH) & Weizmann Inst (IL))
09/07/2012, 12:00
Prof.
Joao Barreiro Guimaraes Da Costa
(Harvard University (US))
09/07/2012, 13:50
Prof.
Alex Pomarol
(Universitat Autonoma de Barcelona (ES))
09/07/2012, 14:20
Prof.
Andy Parker
(University of Cambridge (GB))
09/07/2012, 14:50
Prof.
Raman Sundrum
(University of Maryland (US))
09/07/2012, 15:20
Prof.
Sheldon Stone
(Syracuse University (US))
09/07/2012, 16:10
Prof.
Yoshitaka Kuno
(Osaka University)
09/07/2012, 16:40
Dr
cecilia tarantino
(University Roma Tre)
09/07/2012, 17:10
Plenary Sessions
Dr
Dmitry Bandurin
(Florida State University (US))
10/07/2012, 09:00
Dr
Alexander Glazov
(DESY (DE))
10/07/2012, 09:30
Dr
Paul Newman
(Birmingham University (UK))
10/07/2012, 10:00
Dr
John Campbell
(Fermi National Accelerator Laboratory)
10/07/2012, 10:30
Plenary Sessions
Prof.
Johanna Stachel
(Ruprecht-Karls-Universitaet Heidelberg (DE))
10/07/2012, 11:20
Dr
Carlos Albert Salgado Lopez
(Universidade de Santiago de Compostela (ES))
10/07/2012, 11:50
Dr
James Zanotti
(University of Adelaide (AU))
10/07/2012, 12:20
Dr
Phillip Urquijo
(Universitaet Bonn (DE))
10/07/2012, 14:10
Dr
Teppei Katori
(Massachusetts Institute of Technology (US))
10/07/2012, 14:30
Prof.
Mikihiko Nakao
(KEK IPNS (JP))
10/07/2012, 14:50
Dr
Steven Worm
(CERN (CH))
10/07/2012, 15:40
Dr
Bogdan Dobrescu
(FNAL)
10/07/2012, 16:10
Dr
Roman Mizuk
(Inst. f. Theor. and Exp. Physics (RU))
10/07/2012, 16:40
Plenary Sessions
Prof.
Hiroaki Aihara Aihara
(University of Tokyo), Dr
Pier Oddone
(Ferme National Accelerator Laboratory (US))
10/07/2012, 17:10
Prof.
Takashi Kobayashi
(KEK (JP))
11/07/2012, 09:00
Prof.
Jun Cao
(IHEP (CN))
11/07/2012, 09:30
Prof.
Concepcion Gonzalez-Garcia
(YITP-Stony Brook & ICREA-Barcelona (ES))
11/07/2012, 10:00
Dr
lauren hsu
(Fermilab)
11/07/2012, 10:50
Prof.
Neal Weiner
(New York University (US))
11/07/2012, 11:20
Prof.
Mark Trodden
(University of Pennsylvania)
11/07/2012, 11:50
Prof.
LANCE Dixon
(SLAC National Accelerator Laboratory (US))
11/07/2012, 12:20
Dr
Ian Fisk
(Fermi National Accelerator Lab. (US))
11/07/2012, 14:30
Plenary Sessions
Prof.
Riccardo Barbieri
(Scuola Normale Superiore & INFN (IT))
11/07/2012, 15:00
Plenary Sessions
Prof.
Rolf Heuer
(CERN (CH))
11/07/2012, 16:20
Dr
Edmond Berger
(Argonne National Laboratory (US))
Track 4 - Top Quark Physics
Parallel Sessions
A larger than expected forward-backward asymmetry in rapidity is observed in top quark pairs produced in proton-antiproton collisions at the Tevatron. The asymmetry is seen in both the top quark rapidity distribution $A_{FB}^t$ and in the distribution of charged leptons $A_{FB}^\ell$ from top quark decay. We explore the kinematic and dynamic aspects of the tight relationship of the two...
Dr
Edmond Berger
(Argonne National Laboratory (US))
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
Production in association with a vector boson $V$ is a distinctive mode of production for a Higgs boson $H$ without tree-level couplings to fermions, known as a fermiophobic Higgs boson. We focus on $HV$ associated production with $H$ decay into a pair of photons, and $V$ into a pair of jets, with the goal of distinguishing a fermiophobic Higgs boson from the standard model Higgs boson. ...
Shalhout Shalhout
(UCDAVIS),
Shalhout Shalhout
(University of California Davis (US))
Phillip Urquijo
(Universitaet Bonn (DE))
Plenary Sessions
Plenary Sessions
Teppei Katori
(Massachusetts Institute of Technology)
Plenary Sessions
Plenary Sessions
Dr
Avto Kharchilava
(State University of New York (US))
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
Measurements of the total and differential cross section for the production of b-quarks in association with either W or Z bosons in ppbar collisions at sqrt(s)=1.96 TeV are presented using data collected with the D0 detector at the Fermilab Tevatron collider. The W and Z bosons are identified via their leptonic decays, while the fraction of b-jets is determined via an algorithm that employs...
Dr
Edmond Berger
(Argonne National Laboratory (US))
Track 6. QCD, Jets, Parton Distributions
Parallel Sessions
Next-to-leading order predictions in perturbative QCD are presented of various differential distributions for $p p \rightarrow Wb\bar{b} X \to \ell \nu b \bar{b} X$, and other processes at the CERN Large Hadron Collider. Included are the contributions from both single parton scattering and double parton scattering, as well as relevant backgrounds. Several kinematic variables are proposed for...
Dr
Brian Boyle
Plenary Sessions
Plenary Sessions
Prof.
Youngjoon Kwon
(Yonsei University)
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
Using samples of 102 million $\Upsilon(1S)$ and 158 million $\Upsilon(2S)$ events and about 70 fb${}^{-1}$ of data taken in the nearby continuum with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider, we compare the inclusive production rates of baryons in 3-gluon vs. quark fragmentation processes. The spectra of $p$, $\Lambda$, $\Sigma$, $\Xi$, and $\Omega$ baryons are...
Dr
Stephen Parke
(Fermi National Accelerator Laboratory (US))
Track 4 - Top Quark Physics
Parallel Sessions
A theory review of the latest results for TTbar spin correlations for both quark-antiquark annihilation and gluon-gluon fusion production modes will be given with implications for measurements at both the Tevatron and the LHC. I will comment on the recent measurements made by CDF, D0 as well as Atlas and CMS.
