Stefano Forte
(Università degli Studi e INFN Milano (IT))
27/04/2015, 09:00
Alberto Accardi
(Hampton U. and Jefferson Lab)
27/04/2015, 09:35
Amanda Cooper-Sarkar,
Amanda Sarkar
(University of Oxford (GB))
27/04/2015, 10:10
Tuomas Lappi
(University of Jyvaskyla)
27/04/2015, 11:15
Alexander Dimitrov Mitov
(University of Cambridge (GB))
27/04/2015, 11:50
Frank Siegert
(Technische Universitaet Dresden (DE))
27/04/2015, 14:20
Frank Petriello
(Northwestern University)
27/04/2015, 17:10
katarzyna wichmann
(DESY)
28/04/2015, 08:30
WG1 Structure Functions and Parton Densities
A combination is presented of all inclusive deep inelastic cross sections measured by the H1 and ZEUS collaborations in neutral and charged current unpolarised ep scattering at HERA. The data correspond to a luminosity of about 1 fb-1 and span six orders of magnitude in negative four-momentum-transfer squared, Q², and Bjorken x. They include data taken at proton beam energies of 920, 820, 575...
Elvira Rossi
(Universita e INFN, Napoli (IT))
28/04/2015, 08:30
WG3 Electroweak Physics and Beyond the Standard Model
Run 1 measurements on the production and decay properties of the Higgs boson will be presented.
Sanghoon Lim
(Yonsei University)
28/04/2015, 08:30
WG5 Heavy Flavours
Charm and bottom quarks are formed predominantly by gluon fusion in the initial hard scatterings of heavy-ions at RHIC, so they are good probes of the full medium evolution. In order to further understand the heavy quark dynamics in the hot medium, it is essential to study modifications due to the intrinsic nuclear matter so called cold nuclear matter effects. Deuteron(proton)-gold collisions...
Stefan Prestel
(Deutsches Elektronen-Synchrotron (DE))
28/04/2015, 08:30
WG4 QCD and Hadronic Final States
This contribution reviews recent developments in matching higher-order perturbative QCD calculations to parton-shower event generators.
Prof.
Konstantin Goulianos
(The Rockefeller University)
28/04/2015, 08:30
WG2 Small-x, Diffraction and Vector Mesons
Predictions of diffractive, total, and total-inelastic cross sections at the LHC, based on the pre-LHC renormalization model of diffraction RENORM, are reviewed and compared with the latest experimental results. RENORM is found to be in reasonable agreement with all aspects of the data and is extended to include predictions for the upcoming LHC run at 13 TeV.
Grzegorz Brona
(University of Warsaw (PL))
28/04/2015, 08:55
WG2 Small-x, Diffraction and Vector Mesons
The differential diffractive cross section is measured as a function of xi= M_X^2/s in the region dominated by single dissociation (SD) and double dissociation (DD), where M_X is the mass of one of the two final-state hadronic systems separated by the largest rapidity gap in the event. The cross section is also measured as a function of the width of the central rapidity gap in the region...
Tony Kwan
(University of Victoria (CA))
28/04/2015, 08:55
WG4 QCD and Hadronic Final States
The ATLAS Collaboration has performed precision measurements
of the transverse momentum of the Z/gamma* boson and the angular
correlations of the Drell–Yan lepton pairs with the phi* observable,
in different di-lepton invariant mass and rapidity regions. These
measurements are sensitive to soft resummation effects and hard jet
emissions for small and large momentum transfers,...
Prof.
Zhenyu Ye
(University of Illinois at Chicago)
28/04/2015, 08:55
WG5 Heavy Flavours
High precision measurements of open heavy flavor production in p+p collisions are instrumental to test the validity and constrain the parameters of perturbative QCD (pQCD) calculations. Heavy flavor quarks are also suggested as excellent probes to study the properties of the hot and dense nuclear matter created in high-energy heavy ion collisions. In this talk, we present the most recent...
Christopher Deans
(University of Edinburgh)
28/04/2015, 08:55
WG1 Structure Functions and Parton Densities
I will present NNPDF3.0, the first set of parton distributions determined with a methodology validated by a closure test. NNPDF3.0 uses a global dataset including HERA-II deep-inelastic inclusive cross-sections, the combined HERA charm data, jet production from ATLAS and CMS, vector boson rapidity and transverse momentum distributions from ATLAS, CMS and LHCb, W + c data from CMS and top quark...
John Collins
(Penn State University)
28/04/2015, 09:00
WG6 Spin Physics
In using transverse-momentum-dependent (TMD) parton densities and
fragmentation functions, important non-perturbative information is at
large transverse position $b_T$. This concerns both the TMD functions
and their evolution. Fits to high energy data tend to predict too
rapid evolution when extrapolated to low energies where larger values
of $b_T$ dominate. I summarize a new analysis...
Matthew Wing
(UCL)
28/04/2015, 09:00
WG7 Future experiments
Based on current CERN infrastructure, an electron-proton collider is proposed at a centre-of-mass energy of about 9 TeV. A 7 TeV LHC bunch is used as the proton driver to create a plasma wakefield which then accelerates electrons to 3 TeV, these then colliding with the other 7 TeV LHC proton beam. The basic parameters of the collider are presented, which although of very high energy, has...
Dermot Anthony Moran
(Universidad Autonoma de Madrid (ES))
28/04/2015, 09:05
WG3 Electroweak Physics and Beyond the Standard Model
A search for additional Higgs-like bosons in the H to WW and H to ZZ decay channels is reported, for Higgs boson masses in the range 145 < m_H < 1000 GeV. The search is based upon proton-proton collision data samples corresponding to an integrated luminosity of up to 5.1 fb-1 at sqrt(s) = 7 TeV and up to 19.3 fb-1 at sqrt(s) = 8 TeV, recorded by the CMS experiment at the LHC. Several final...
Dr
Deepa Thomas
(ALICE Collaboration)
28/04/2015, 09:20
WG5 Heavy Flavours
In hadronic collisions, heavy quarks (charm and beauty) are produced in hard scattering processes with large momentum transfer. The measurement of the production cross sections of heavy-flavour hadrons in pp collisions provides an important test of pQCD calculations. Some insight into the role of multi-parton interactions (MPI) and the interplay between hard and soft mechanism for particle...
C.-P. Yuan
(Michigan State University)
28/04/2015, 09:20
WG1 Structure Functions and Parton Densities
I review progress in the global PDF analysis by the CTEQ-TEA group.
Dr
Mario Deile
(CERN)
28/04/2015, 09:20
WG2 Small-x, Diffraction and Vector Mesons
We present the final results on low-$|t|$ elastic proton-proton scattering at $\sqrt{s} = 8$ TeV based on two data sets acquired with different, dedicated beam-optics settings. A very high statistics sample allowed, for the first time at LHC energies, the exclusion of a purely exponential differential cross-section in the four-momentum range $0.027 < |t| < 0.2~\rm GeV^2$ with a significance...
Marco Vanadia
(Universita e INFN, Roma I (IT))
28/04/2015, 09:25
WG3 Electroweak Physics and Beyond the Standard Model
The discovery of a Higgs boson with a mass of about 125 GeV
has prompted the question of whether or not this particle is part of a
larger and more complex Higgs sector than that envisioned in the
Standard Model. In this talk, the latest Run 1 results from the ATLAS
Experiment on Beyond-the-Standard Model (BSM) Higgs searches are
outlined. Searches for additional Higgs bosons are...
He Zhang
(Jefferson Lab)
28/04/2015, 09:25
WG7 Future experiments
At Jefferson Lab, the conceptual design of a next generation facility, the medium energy electron ion collider (MEIC), to reach the frontier in Quantum Chromodynamics has been carried on for years. The MEIC will provide an electron beam with energy up to 10 GeV, a proton beam with energy up to 100 GeV, and heavy ion beams with corresponding energy per nucleon with the same magnetic rigidity. ...
Prof.
Yuji Koike
(Niigata University)
28/04/2015, 09:25
WG6 Spin Physics
In this talk, I will present an overview on the current status of the analyses of the
spin asymmetries, in particular, single spin asymmetries, using the framework of
the collinear twist-3 (CT3) factorization.
In this framework, twist-3 quark-gluon or three-gluon correlation functions
in the initial nucleon and the twist-3 fragmentation function for the final hadron
play a critical...
Harikrishnan Ramani
(Yang Institute Of Theoretical Physics)
28/04/2015, 09:45
WG4 QCD and Hadronic Final States
The WW production cross-section measured at the LHC has been consistently exhibiting a mild excess beyond the SM prediction leading to speculations that new physics could be hiding in these measurements. In this talk, I discuss a possible explanation of the excess in terms of large logarithms that arise from a jet-veto condition that is imposed in the experimental analyses to reduce...
Leszek Adamczyk
(AGH University of Science and Technology (PL)),
Leszek Adamczyk
(AGH University of Science and Technology (PL))
28/04/2015, 09:45
WG2 Small-x, Diffraction and Vector Mesons
The total pp cross section is a fundamental parameter of the strong interaction which cannot be calculated in QCD but still can be measured using the optical theorem, which states that the total cross section can be obtained from the extrapolation to t=0 of the differential elastic cross section measured at small four-momentum transfer t.
The ATLAS Collaboration has collected 80 mub-1 of...
Dr
Wally Melnitchouk
(Jefferson Lab)
28/04/2015, 09:45
WG1 Structure Functions and Parton Densities
We present preliminary results of a new global QCD analysis of PDFs
from the CTEQ-Jefferson Lab Collaboration (dubbed "CJ15"), which
includes several new data sets and recent theoretical developments.
In particular, we study the constraints from new D0 data on *W* boson
asymmetries on the *d/u* PDF ratio at large *x*, and, indirectly, on
the models of nuclear corrections in the deuteron. ...
Karol Kovarik
28/04/2015, 09:45
WG5 Heavy Flavours
We present a comparison of NLO QCD predictions for heavy-quark production
at the LHC. We compare theoretical predictions obtained with POWHEG to different predictions where fixed-order calculations are extended with next-to-leading logarithms and to predictions using the GM-VFNS. We focus on the productions of neutral and charged D mesons in proton-proton collisions at ALICE in an attempt to...
Marc Gabriel Weinberg
(Florida State University (US))
28/04/2015, 09:45
WG3 Electroweak Physics and Beyond the Standard Model
Several models of new physics predict the existence of new light bosons that are weakly coupled to SM particles. Two examples include SUSY with a "dark" sector (in which the new light bosons can also be relatively long-lived) or models with an extended Higgs sector, e.g. NMSSM. In these scenarios, the new bosons can be produced either in the Higgs decays or as part of SUSY cascades. In the...
Emilia Cruz Alaniz
(University of Liverpool)
28/04/2015, 09:50
WG7 Future experiments
An intense electron beam, when combined with the LHC (LHeC) or, in the further future, the FCC hadron beams (FCC-he), can lead to a unique, energy frontier DIS collider at CERN. This talk presents a summary of recent studies, including those about the design of the SCRF cavities and an initial Energy Recovery Linac Test Facility.
Daniel Pitonyak
(Brookhaven National Lab)
28/04/2015, 09:50
WG6 Spin Physics
Transverse single-spin asymmetries (TSSAs), denoted A_N, in single-inclusive hard scattering processes are fundamental observables to test perturbative QCD that have been around for almost 40 years. However, many open issues remain as to the origin of TSSAs. Currently two theoretical formalisms are widely used: collinear twist-3 (CT3) factorization and the Generalized Parton Model (GPM). We...
Yuhong Zhang
(Thomas Jefferson National Accelerator Facility)
28/04/2015, 10:45
WG7 Future experiments
The proposal of Construction of CepC and SppC, the next generation energy frontier e+e- and pp circular colliders, in a common accelerator complex provides an opportunity to realize collisions of protons or ions with electrons or positrons in an ultra high center-of-mass energy range up to 4.2 TeV. This paper presents a preliminary design study of this e-p/A collider based on the CepC-SppC...
Justas Zalieckas
(University of Bergen (NO))
28/04/2015, 10:45
WG5 Heavy Flavours
We present the latest results from the ATLAS experiment on
B-hadron production, including the Bc+ production cross-section
measurement, observation of the B_c(2S) state, branching ratio
measurement of B_c->J/psiD(\*) decay and extraction of fragmentation
fractions fs/fd via reconstructed Bs->J/psiPhi and Bd->J/psiK* decays.
Ye Li
(SLAC)
28/04/2015, 10:45
WG3 Electroweak Physics and Beyond the Standard Model
We present the soft-virtual corrections to Higgs boson production in gluon fusion for infinite top quark mass at next-to-next-to-next-to-leading order in QCD. In addition, we show analogous soft-virtual terms for both Drell-Yan lepton production in QCD and scalar pair production in N = 4 super Yang-Mills theory. The result for Drell-Yan lepton production is derived from the result for Higgs...
Volodymyr myronenko
(DESY)
28/04/2015, 10:45
WG1 Structure Functions and Parton Densities
The new combined inclusive HERA cross sections were input to QCD
analyses at NNLO, NLO and LO providing a new set of parton
distribution functions, HERAPDF2.0. Besides the small experimental
uncertainties, model and parameterisation uncertainties were also
considered. The consistency of data and the QCD fit was tested for
variants of the fit such as the treatment of heavy flavour...
Anselm Vossen
(Indiana University)
28/04/2015, 10:45
WG6 Spin Physics
Fragmentation functions are fundamental objects that describe the process by which partons hadronize to colorless hadrons.
Precision measurements of fragmentation functions are necessary for the extraction of most aspects of the nucleon structure from semi-inclusive deep inelastic scattering and p+p collision data.
Examples are transverse polarization dependent fragmentation functions that...
Michael Albrow
(Fermi National Accelerator Lab. (US))
28/04/2015, 10:45
WG2 Small-x, Diffraction and Vector Mesons
The CMS-TOTEM Precision Proton Spectrometer, CT-PPS, is an approved project to add
3D silicon tracking and quartz Cherenkov timing detectors in Roman pots at z = +/- 210 m
from the CMS collision point to study final states p + X + p. The central state X can be a W-pair from photon-photon interactions, a set of high-ET jets from gluon collisions, among others, with M(X) obtained directly as...
Dr
Jun Gao
(Argonne National Lab)
28/04/2015, 11:05
WG3 Electroweak Physics and Beyond the Standard Model
We present a study of the Higgs boson pT spectrum in hadronic collisions that incorporates all available perturbative information. A detailed investigation of the uncertainties affecting the prediction for the LHC is provided.
Ilkka Helenius
(Helsinki Institute of Physics (HIP)-Univ. of Helsinki, Fac. of S), Mr
Ilkka Helenius
(Lund University)
28/04/2015, 11:10
WG7 Future experiments
An intense electron beam, when combined with the LHC (LHeC) or, in the further future, the FCC hadron beams (FCC-he), can lead to a unique, energy frontier DIS collider at CERN. New results are shown of evaluations of the potential of eA physics at the energy frontier, including, for the first time, a determination of nuclear parton distributions based on only (simulated) eA data input.
Ringaile Placakyte
(Hamburg University)
28/04/2015, 11:10
WG1 Structure Functions and Parton Densities
The uncertainties of protons parton distribution functions (PDFs) play a dominant role for the precision tests of the Standard Model (SM) and they also impact substantially the theory predictions of Beyond SM high mass production. We present the HERAFitter project which provides a unique open-source software framework for the determination of the proton's PDFs and for the interpretation of...
Alex Kovner
(UConn)
28/04/2015, 11:10
WG2 Small-x, Diffraction and Vector Mesons
We reconsider the perturbative next-to-leading calculation of the single inclusive hadron production in the framework of the hybrid formalism, applied to hadron production in proton-nucleus collisions. We introduce the explicit requirement that fast fluctuations in the projectile wave function which only exist for a short time are not resolved by the target. This Ioffe time cutoff also...
Marcin Chrzaszcz
(University of Zurich (CH), Polish Academy of Sciences (PL))
28/04/2015, 11:10
WG5 Heavy Flavours
An overview of the latest LHCb results on rare b and c-hadron decays is presented
Isabella Garzia
(INFN)
28/04/2015, 11:10
WG6 Spin Physics
Inclusive hadron production cross sections and angular distributions in
e+e- collisions shed light on fundamental questions of hadronization and
fragmentation processes. We present measurements of the so-called Collins azimuthal asymmetries in inclusive production of hadron pairs, in the e+e- -> h1 h2 X annihilation process, where the two hadrons (either kaon or pions) are produced in...
Richard Keith Ellis
(Fermi National Accelerator Lab. (US))
28/04/2015, 11:25
WG3 Electroweak Physics and Beyond the Standard Model
The current status of theoretical predictions for off-shell Higgs boson production and the implications for bounds on the Higgs boson width are reviewed.
Mohammad Ahmady
(Mount Allison University)
28/04/2015, 11:35
WG5 Heavy Flavours
We use the light front wavefunction for meson bound state obtained from holographic anti–de Sitter/chromodynamics to calculate the distribution amplitudes (DAs) for $\rho$ and $K^*$ vector mesons. Consequently, these DAs are utilized to compute the form factors for $B\to\rho ,K^*$ transition via light cone sum rules. Our predictions for semileptonic and rare B decays are compared with...
Pavel Starovoitov
(Deutsches Elektronen-Synchrotron (DE))
28/04/2015, 11:35
WG1 Structure Functions and Parton Densities
A method to facilitate the inclusion of collider data in the PDF fits, APPLGRID, has been extended to the NNLO accuracy. The method stores the matrix elements of the NNLO calculations to the look-up tables. This allows the a posteriori inclusion of the PDF sets and the strong coupling to the cross-section calculations.
Piotr Kotko
28/04/2015, 11:35
WG2 Small-x, Diffraction and Vector Mesons
We study forward dijet production in dilute-dense hadronic collisions. By considering the appropriate limits, we show that both the transverse-momentum-dependent (TMD) and the high-energy factorization formulas can be derived from the Color Glass Condensate framework. Respectively, this happens when the transverse momentum imbalance of the dijet system, $k_t$, is of the order of either the...
Isabella Garzia
(INFN)
28/04/2015, 11:35
WG6 Spin Physics
There has been increasing interest in understanding the spin phenomena in the nucleon, such as the transverse spin structure (the so-called transversity). The semi-inclusive observables in SIDIS experiments are only connected to the product of quark transversity distribution and the Collins fragmentation function (FF). An independent measurement of the Collins FFs in e+e- annihilation makes...
Prof.
Zhenyu Ye
(University of Illinois at Chicago)
28/04/2015, 11:35
WG7 Future experiments
The STAR collaboration proposes to construct a Forward Calorimeter System and Forward Tracking System for future polarized p+p, polarized p+A, and A+A beam operations at RHIC. The main scientific goals are to study Quantum Chromo Dynamics (QCD) in the high and low Bjorken-x domain and to explore the properties of the strongly interacting Quark-Gluon Plasma (QGP). The proposed upgrades will...
David Marzocca
(University of Zurich)
28/04/2015, 11:45
WG3 Electroweak Physics and Beyond the Standard Model
We introduce a set of pseudo-observables, defined from the on-shell amplitudes, characterizing the properties of Higgs decays in generic extensions of the Standard Model with no new particles below the Higgs mass. These provide a systematic generalization of the kappa framework used by the LHC experiments. The pseudo-observabls allow for a systematic inclusion of higher order QED and QCD...
Adrian Dumitru
(Baruch College (City University of New York))
28/04/2015, 12:00
WG2 Small-x, Diffraction and Vector Mesons
Experiments at RHIC and the LHC have revealed anisotropic
multi-particle azimuthal correlations in high multiplicity pp and pA
collisions. These correlations are long range in rapidity (resp. log 1/x) and extend to semi-hard transverse momenta of several GeV. I discuss first steps towards understanding azimuthal correlations from
small-x QCD, and the information they could provide about...
Dr
Erin SEDER
(CEA Saclay, DSM/IRFU/SPhN)
28/04/2015, 12:00
WG6 Spin Physics
The latest measurements of $K^{\pm}$ multiplicities in semi-inclusive deep-inelastic scattering from the COMPASS experiment at CERN are presented. The data were collected using a $160$ $GeV$ muon beam incident on an isoscalar $^{6}LiD$ target. The large statistics collected cover a wide kinematic range and the results are presented in 3-dimensional bins of $x_{Bjorken}$, $y$, and $z$. These...
Flera Rizatdinova
(Oklahoma SU)
28/04/2015, 12:00
WG7 Future experiments
Run-I at the LHC has been very successful, including the
discovery of a new particle with a mass of about 125 GeV and with
properties compatible with those of the Standard Model Higgs boson
within uncertainties. Precise measurements of the properties of this
boson, and the discovery of new physics beyond the Standard Model, are
primary goals of future running at the LHC. The physics...
Fred Stober
(KIT - Karlsruhe Institute of Technology (DE))
28/04/2015, 12:00
Prof.
Chung-I Tan
(Brown University)
28/04/2015, 14:00
WG2 Small-x, Diffraction and Vector Mesons
We focus on a holographic approach to DIS at small-x in high energy where scattering is dominated by exchanging a Reggeized Graviton in $AdS_5$. We emphasize the importance of confinement, which corresponds to a deformation of $AdS_5$ geometry in the IR. This approach provides
an excellent fit to the combined HERA data at small $x$. We also discuss the constraints of unitarity and...
Dr
Zhiwen Zhao
(JLab & Old Dominion University)
28/04/2015, 14:00
WG7 Future experiments
The Electron-Ion Collider (EIC) is envisioned as the next-generation US facility for exploring the strong interaction. The Medium-energy EIC (MEIC) is the first stage of the EIC at Jefferson Lab (JLab). aimed at mapping the spin and spatial structure of the quark and gluon sea in the nucleon, understanding the emergence of hadronic matter from color charge, and probing the gluon fields in...
Dr
Aleksander Kusina
(LPSC Grenoble)
28/04/2015, 14:00
WG1 Structure Functions and Parton Densities
We present the first official release of the nCTEQ nuclear parton distribution functions with errors.
The main addition to the previous nCTEQ PDFs is the introduction of PDF uncertainties based on the Hessian method. Another important addition is the inclusion of pion production data from RHIC giving us a handle
to constrain gluon PDF.
In this presentation we briefly discuss the framework...
Dr
Edith Zinhle buthelezi
(iThemba LABS, Cape Town)
28/04/2015, 14:00
WG3 Electroweak Physics and Beyond the Standard Model
by E.Z. Buthelezi for the ALICE collaboration,
Department of Nuclear Physics, iThemba LABS, Cape Town, South Africa.
W bosons are produced in hard scattering processes of partons in collisions of hadrons and they do not interact strongly with the medium produced in high-energy heavy-ion collisions. Therefore, in p-Pb collisions the measurement of W-boson yields represents a standard...
Wenjuan Mao
(Southeast University)
28/04/2015, 14:00
WG6 Spin Physics
We study the single-spin asymmetries with the $\sin\phi_S$
and $\sin(2\phi_h -\phi_S)$ angular dependencies of pion production in semi-inclusive deep inelastic scattering off a transversely polarized proton target. We investigate the role of the distributions $f_T$, $h_T$ and $h_T^\perp$ in the $\sin\phi_S$ asymmetry, as well as the role of the distributions $f_T^\perp$, $h_T$ and $h_T^\perp$...
Cosmin Dragoiu
(Texas Tech University (US))
28/04/2015, 14:20
WG3 Electroweak Physics and Beyond the Standard Model
The production of W and Z bosons has been observed in pp collisions at a center-of-mass energy of 7 and 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...
Mr
Peter Lowdon
(University of Zurich)
28/04/2015, 14:25
WG6 Spin Physics
The decomposition of nucleon spin into spin and orbital angular momentum contributions from partons is revisited in the context of quantum field theory. It is shown that commonly used decompositions rely on classical-type arguments for their justification, and that these arguments may no longer hold in the full quantum theory, in particular with respect to the treatment of boundary terms. The...
Dr
Stefan Schmitt
(Deutsches Elektronen-Synchrotron (DE))
28/04/2015, 14:25
WG2 Small-x, Diffraction and Vector Mesons
A measurement is presented of single- and double-differential dijet cross sections in diffractive deep-inelastic ep scattering at HERA using data collected by the H1 experiment corresponding to an integrated luminosity of 290 pb^{-1}. The investigated phase space is spanned by the photon virtuality in the range of 4< Q^{2} <100 GeV^{2} and by the fractional proton longitudinal momentum loss...
Mr
Ilkka Helenius
(Lund University)
28/04/2015, 14:25
WG1 Structure Functions and Parton Densities
The current nuclear PDF analyses are mainly constrained by fixed-target
DY and DIS data which provide direct constraints primarily for quarks at
$x > 0.001$. Some constraints for gluons are provided by the inclusive
pion production data in d+Au collisions at RHIC but due to the limited
kinematic reach of the data the small-$x$ nuclear gluon PDFs remain
practically unconstrained in the...
Dr
Nils Feege
(Stony Brook University)
28/04/2015, 14:25
WG7 Future experiments
The Electron Ion Collider (EIC, arXiv:1212.1701.v3) will allow for precision measurements of the partonic and spin structure of nucleons and the partonic structure of nuclear matter using e+p and e+A collisions, respectively. One of the realizations of the EIC, the eRHIC at BNL, plans to utilize the existing RHIC storage rings (polarized proton and other ion beams) and a high-intensity...
Gerhard Immanuel Brandt
(Georg-August-Universitaet Goettingen (DE))
28/04/2015, 14:35
WG3 Electroweak Physics and Beyond the Standard Model
The ATLAS Collaboration is engaged in precision measurement
of fundamental Standard Model parameters, e.g. the weak-mixing angle
and the complete set of coefficients that describe the angular
distributions of Drell-Yan production. A measurement of the
forward-backward asymmetry for the neutral current Drell Yan process
is presented and the results are then used to extract a measurement...
Dr
Alexander Kiselev
(Brookhaven National Laboratory)
28/04/2015, 14:50
WG7 Future experiments
Construction of an Electron-Ion Collider with luminosities exceeding $10^{33}~cm^{-1}s^{-1}$ is becoming a project of highest priority for the US
Nuclear Physics community.
The main physics topics to be explored at this new facility are (i) the polarized sea quark and gluon distributions
in the nucleon, (ii) QCD dynamics of the low-x, high density gluon regime,
(iii) hadronization and...
Dr
Stefan Schmitt
(Deutsches Elektronen-Synchrotron (DE))
28/04/2015, 14:50
WG2 Small-x, Diffraction and Vector Mesons
The cross section of the diffractive process e^+p -> e^+Xp is measured at a centre-of-mass energy of 318 GeV, where the system X contains at least two jets and the leading final state proton p is detected in the H1 Very Forward Proton Spectrometer. The measurement is performed in photoproduction with photon virtualities Q^2 <2 GeV^2 and in deep-inelastic scattering with 4 GeV^2< Q^2 <80 GeV^2....
Dr
LINGYUN DAI
(Indiana University)
28/04/2015, 14:50
WG6 Spin Physics
We study the Sivers asymmetry in semi-inclusive hadron production in deep inelastic scattering. In particular, we concentrate on the contribution from the photon-gluon fusion channel, where the three-gluon correlation functions play the major role within a twist-3 collinear factorization formalism. We establish the matching between such a formalism and the usual transverse momentum dependent...
Roberto Petti
(University of South Carolina (US)), Dr
Sergey Kulagin
(INR)
28/04/2015, 14:50
WG1 Structure Functions and Parton Densities
We study the nuclear parton distribution functions [1] on the basis of our recently developed semi-microscopic model [2], which takes into account a number of nuclear effects including nuclear shadowing, Fermi motion and nuclear binding, nuclear meson-exchange currents and off-shell corrections to bound nucleon distributions.
We discuss in details the dependencies of nuclear effects on the...
Ronan James Wallace
(University College Dublin (IE))
28/04/2015, 14:55
WG2 Small-x, Diffraction and Vector Mesons
The latest results on Z and W production measured by LHCb in the forward region are
presented.
Max Klein
(University of Liverpool (GB))
28/04/2015, 15:15
WG7 Future experiments
An intense electron beam, when combined with the LHC (LHeC) or, in the further future, the FCC hadron beams (FCC-he), can lead to a unique, energy frontier DIS collider at CERN. Updates of the LHeC ep/A detector configuration are presented with a view to optimising Higgs physics and to extend the concept to the FCC-he.
Karen Chen
(Stony Brook University (US))
28/04/2015, 15:15
WG3 Electroweak Physics and Beyond the Standard Model
The ATLAS collaboration has carried a set of measurements that provide stringent tests of the electroweak sector of Standard Model, specifically on di- and multi-boson production cross sections and on triple and quartic gauge-boson couplings. Such measurements include cross sections for WV (V=W or Z) production in the leptonic or semileptonic channels, the production of a W or Z boson in...
Antonia Di Crescenzo
28/04/2015, 15:15
WG1 Structure Functions and Parton Densities
SHIP is a new general purpose fixed target facility, proposed at the CERN SPS accelerator.
In its initial phase the 400GeV proton beam will be dumped on a heavy target with the aim of integrating $2\times 10^{20}$ pot in 5 years.
A dedicated detector downstream the target will allow to probe a variety of models with light long-lived exotic particles and masses below O(10)...
Leszek Adamczyk
(Cracow AGH-UST),
Leszek Adamczyk
(AGH University of Science and Technology (PL))
28/04/2015, 15:15
WG2 Small-x, Diffraction and Vector Mesons
The exclusive dijet production in diffractive deep inelastic $e^\pm p$ scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 372 pb$^{−1}$. The measurement was performed for $\gamma^*-p$ centre-of-mass energies in the range $90 < W < 250$ GeV and photon virtualities in the range $Q^2$ > 25 GeV$^2$ . Energy and transverse-energy flows around the jet axis...
Harleen Dahiya
(Dr. B.R. Ambedkar National Institute of Technology)
28/04/2015, 15:15
WG6 Spin Physics
The axial-vector form factors of the low lying octet baryons ($N$, $\Sigma$, $\Xi$ and $\Lambda$) have been studied for the implications of chiral symmetry breaking and SU(3) symmetry breaking for the singlet ($g^0_{A}$) and non-singlet ($g^3_{A}$ and $g^8_{A}$) axial-vector coupling constants. In addition to studying the total strange singlet and non-singlet contents ($G_s^0(Q^2)$,...
Joel Mousseau
28/04/2015, 16:15
WG1 Structure Functions and Parton Densities
Neutrinos provide a unique probe of nuclear structure as they interact weakly and couple with partons via the axial as well as the vector current. The MINERvA experiment takes advantage of the Fermilab NuMI beam line and multiple nuclear targets to study neutrino + nucleus interactions. This talk presents preliminary results of MINERvA’s DIS sample in the neutrino energy ($E_{\nu}$) range of 5...
Ashish Kumar
(State University of New York (US))
28/04/2015, 16:15
WG4 QCD and Hadronic Final States
We present recent results on heavy flavor jet production in association with weak vector bosons using proton-antiproton collision data collected with the D0 detector at center of mass energy sqrt{s}=1.96 TeV. We discuss in particular the measurements of W+b/c-jet production cross-sections and the ratio of cross-sections, sigma(Z+2b-jet)/sigma(Z+2jets). Study of these processes provide tests...
Jordan Damgov
(Texas Tech University (US))
28/04/2015, 16:15
WG3 Electroweak Physics and Beyond the Standard Model
A search for exclusive or quasi-exclusive W+ W- production induced by photon-photon exchange in pp collisions at sqrt(s)=8 TeV is reported using data corresponding to an integrated luminosity of 19.7 fb-1. Events are selected by requiring the presence of an electron-muon pair with large transverse momentum pT > 30 GeV and no associated charged particles detected from the same vertex. The...
Mr
giulio sbrizzai
(Trieste University and INFN)
28/04/2015, 16:15
WG6 Spin Physics
Recent results on the transverse spin azimuthal asymmetries in
semi-inclusive DIS reactions extracted by the COMPASS Collaboration
from the data collected with a transversely polarised proton target
are presented.
In particular, the interesting kinematical dependencies shown by the Collins
and Sivers asymmetries have been further investigated in a multi-dimensional analysis in x, Q^2, z...
Michal Praszalowicz
(Jagellonian University, Krakow)
28/04/2015, 16:15
WG2 Small-x, Diffraction and Vector Mesons
Gluon distrubutions of colliding hadrons saturate
as a consequence of non-linear evolution equations of QCD.
Saturation implies the existence of the so called
saturation momentum, which is related to the gluon density
per unit rapidity per transverse area. At large energies
in some regions of phase space the saturation momentum
is the only scale for physical processes. As a...
Iouri Smirnov
(Northern Illinois University (US))
28/04/2015, 16:15
WG7 Future experiments
The Tile Calorimeter (TileCal) of the ATLAS experiment at the LHC is the hadronic calorimeter designed for energy reconstruction of hadrons, jets, tau-particles and missing transverse energy. A summary of performance results for TileCal using pp collisions from the LHC Run I will be presented. For Run 2, which will start this summer, the expected effects of increasing pile-up with rising...
47.
Combination of D* Differential Cross-SectionMeasurements in Deep-Inelastic ep Scattering at HERA
Olaf Behnke
(DESY)
28/04/2015, 16:40
WG4 QCD and Hadronic Final States
H1 and ZEUS have published single-differential cross sections for inclusive D* meson production in deep-inelastic ep scattering at HERA from their respective final data sets. These cross sections are combined in the common visible phase space region of photon virtuality Q² > 5 GeV², electron inelasticity 0.02 < y < 0.7 and the D* meson's transverse momentum p_T (D*)> 1.5 GeV and pseudorapidity...
Dr
Xinchun Tian
(Univ. of South Carolina)
28/04/2015, 16:40
WG1 Structure Functions and Parton Densities
Resonance interaction is one of the most important neutrino interaction modes for neutrino oscillation experiments in the few-GeV energy region. This talk presents the analysis of resonance production in neutrino charged current interaction. The study is extended to the NOMAD data allowing the most precise neutrino resonance measurement to date. Some of the current discrepancies in the...
Dr
Salvatore Fazio
(Brookhaven National Laboratory)
28/04/2015, 16:40
WG1 Structure Functions and Parton Densities
We present the status and preliminary results on the analysis of kinematically fully reconstructed weak bosons at the STAR experiment.
The transverse single spin asymmetry ($A_{N}$) has been measured in transversely
polarized proton-proton collisions at $\sqrt{s} = 500$~GeV, with a recorded integrated luminosity of $25~\text{pb}^{-1}$.
The measured observable is sensitive to the...
28/04/2015, 16:40
Martin Hentschinski
(Institute for Nuclear Science, UNAM)
28/04/2015, 16:40
WG2 Small-x, Diffraction and Vector Mesons
We present the results for the calculation of the forward jet vertex associated to a rapidity gap (coupling of a hard pomeron to the jet) in the Balitsky-Fadin-Kuraev-Lipatov (BFKL) formalism at next-to-leading order (NLO). We handle the real emission contributions making use of the high energy effective action proposed by Lipatov, valid for multi-Regge and quasi-multi-Regge kinematics. This...
Harikrishnan Ramani
(Yang Institute Of Theoretical Physics)
28/04/2015, 16:40
WG3 Electroweak Physics and Beyond the Standard Model
Run 1 of the LHC has reported routine excesses in WW measurements both at 7 and 8 TeV. I shall demonstrate that accounting for higher order QCD effects through pT resummation can account for some of the differences between theory and experiment. A closely related approach; jet veto resummation has also had success explaining this excess. I will also talk about where these methods agree and...
Jia Zhou
(SUNY at Buffalo)
28/04/2015, 17:00
WG3 Electroweak Physics and Beyond the Standard Model
Electroweak (EW) corrections at the LHC can be enhanced at high
energies due to soft/collinear radiation of W and Z bosons, being
dominated by Sudakov-like corrections in the form of
$\alpha_W^l\log^n(Q^2/M_W^2)\;(n\le 2l-1, \alpha_W =
\frac{\alpha}{4\pi\sin\theta_W^2})$ when the energy scale $Q$ enters
the TeV regime. Thus, the inclusion of EW corrections in LHC predictions
is...
J. Osvaldo Gonzalez H.
(University of Turin)
28/04/2015, 17:05
WG6 Spin Physics
In order to describe SIDIS over a wide region of transverse momentum qT , one must confront both the perturbative and non-perturbative regimes. In this sense, when extracting the non-perturbative TMDs from experimental data, one should ensure that there exists a smooth transition between the soft gluon resummation regime and the pQCD predictions, at large qT. We present recent results on the...
Vittorio Paolone
(University of Pittsburgh)
28/04/2015, 17:05
WG1 Structure Functions and Parton Densities
The high resolution near detector for the LBNE/F experiment, in conjunction with the high intensity and broad
energy range of the LBNE/F beam, will allow to collect about 10^8 inclusive neutrino charged current (CC)
interactions with a bubble-chamber quality reconstruction. Precision measurements of cross-sections
for several exclusive processes and of structure functions (F_T, F_2, F_3, R)...
Amir Rezaeian
(Universidad Tecnica Federico Santa Maria)
28/04/2015, 17:05
WG2 Small-x, Diffraction and Vector Mesons
I will discuss that diffractive production at small-x, including diffractive photo production of vector mesons and dijet can be a powerful probe of non-linear gluon-saturation dynamics [1,2]. In particular, I will focus on the diffractive dijet production at HERA and the LHC within the color-glass-condensate approach [2]. I will show that the t-distribution of photoproduction of dijet and...
Braden Keim Abbott
(University of Oklahoma (US))
28/04/2015, 17:05
WG4 QCD and Hadronic Final States
We present a measurement of the forward-backward asymmetry in the production of B± mesons, Λb baryons and Λ baryons in 10.4 fb−1 of ppbar collisions at √s=1.96 TeV collected by the D0 experiment during Run II of the Tevatron collider. Nonzero asymmetries would indicate a preference for a particular flavor, i.e., b quark or b antiquark, to be produced in the direction of the proton beam. These...
Richard Ruiz
(University of Pittsburgh)
28/04/2015, 17:20
WG3 Electroweak Physics and Beyond the Standard Model
Vector boson fusion processes become increasingly more important at higher collider energies and for probing larger mass scales due to collinear logarithmic enhancements of cross sections. We consider the specific case of WA fusion at hadron colliders, and systematically categorize the contributions from an initial state photon in the elastic, inelastic, and deeply inelastic channels. Scale...
Prof.
Kirill Tuchin
(Iowa State University)
28/04/2015, 17:30
WG2 Small-x, Diffraction and Vector Mesons
I calculate the Coulomb corrections to the total and diffractive cross sections
in DIS off heavy nuclei. I show that they violate the geometric
scaling and have important phenomenological implications for a future EIC program.
Tie-Jiun Hou
(SMU)
28/04/2015, 17:30
WG5 Heavy Flavours
The LHC is the hardron collider with highest energy in the history. Taking the LHC run 1 data into account and considering more flexible parametrization, the CTEQ-TEA group study its impact on Parton distribution function, the CT14 PDFs. In this talk, we will present the recent study on heavy flavors base on the preliminary CT14 candidate.
Aurore Courtoy
(IFPA)
28/04/2015, 17:30
WG6 Spin Physics
We present an updated extraction of the valence transversity PDF using the most recent COMPASS data with identified pion pairs. The new analysis was carried out using the replica method for both the chiral-odd DiFF and the transversity PDF. This picture represents the current most realistic estimate of the uncertainties on our knowledge of the valence components of the transversity function...
Dr
Elena Accomando
(University of Southampton)
28/04/2015, 17:40
WG3 Electroweak Physics and Beyond the Standard Model
The Forward-Backward Asymmetry (AFB) in Z' physics is commonly only perceived as the observable which possibly allows one to interpret a Z' signal by distinguishing different models of such (heavy) spin-1 bosons. In this talk, we examine the potential of AFB in setting bounds on or even discovering a Z' boson at the Large Hadron Collider (LHC) and show that it might be a powerful tool for this...
Juri Fiaschi
(University of Southampton)
28/04/2015, 18:00
WG3 Electroweak Physics and Beyond the Standard Model
Di-lepton production at hadron colliders is by far the preferred channel to search for Z ′ bosons.
Traditionally, such searches have exploited the Narrow Width Approximation (NWA) for the signal,
thereby neglecting the presence of both (Z ′ ) finite width and interference (with the Standard
Model) effects. Furthermore, the primary observable used has traditionally been the cross...
Jonathan Wilson
(University of Michigan)
29/04/2015, 08:30
WG5 Heavy Flavours
One of the most intriguing measurements in particle physics in recent years is the forward-backward asymmetry of top quark production. Although calculations at next-to-next-to-leading order have largely resolved the anomaly, these measurements are still very interesting as precision tests of the standard model and of physics beyond the standard model. We summarize the results on the top...
Joakim Nystrand
(University of Bergen (NO))
29/04/2015, 08:30
WG2 Small-x, Diffraction and Vector Mesons
Particle production through photon-induced processes in
ultra-peripheral collisions has attracted an increasing interest
following the first heavy-ion runs at the CERN Large Haron Collider.
The increased collision energy compared with the Relativistic
Heavy-Ion Collider (RHIC) at BNL implies that also heavy final states
can be produced in abundance. The focus has so far been on...
Cedric Mezrag
29/04/2015, 08:30
WG1 Structure Functions and Parton Densities
We compute the pion quark Generalized Parton Distribution H and quark Double Distributions in a coupled Bethe-Salpeter and Dyson-Schwinger approach in terms of quarks flavors or isospin states. We use simple analytic expressions inspired by the numerical resolution of Dyson-Schwinger and Bethe-Salpeter equations. We obtain an analytic expression for the pion Generalized Parton Distribution at...
Sanshiro Mizuno
(University of Tsukuba (JP))
29/04/2015, 08:30
WG4 QCD and Hadronic Final States
Direct photons are very interesting probes because they are not modified once created and emitted during all stages of the collisions.
Especially soft photons have been actively measured to study the hot and dense medium (QGP) created in high energy heavy ion collisions.
It is expected that direct photons have different angular emission patterns depending on their production...
Uta Klein
(University of Liverpool (GB))
29/04/2015, 08:30
WG7 Future experiments
An intense electron beam, when combined with the LHC (LHeC) or, in the further future, the FCC hadron beams (FCC-he), can lead to a unique, energy frontier DIS collider at CERN. In this talk, simulations are shown and prospects are outlined for precision measurements of the Higgs boson properties in high luminosity CC scattering at the LHeC.
Prof.
simonetta liuti
(university of virginia)
29/04/2015, 08:30
WG6 Spin Physics
We discuss the canonical (Ji) and kinetic/mechanical (Jaffe and Manohar)
definitions of partonic orbital angular momentum (OAM). It was recently
shown by Hatta and Burkardt that the two definitions correspond to the
second moment in intrinsic k_T of the same generalized transverse momentum
distribution (GTMD), while they differ in their gauge link structure. At
the same time, as...
Petr Balek
(Charles University (CZ))
29/04/2015, 08:50
WG4 QCD and Hadronic Final States
Recent results on electroweak probes in lead-lead and
proton-lead collisions from the ATLAS Detector at the LHC
Abstract: Photons and weak bosons do not interact strongly with the
dense and hot medium formed in the nuclei collisions, thus should be
sensitive to the nuclear modification of parton distribution functions
(nPDFs). In particular, proton-lead collisions provide an...
Jaime Hernandez
(B), Dr
Jaime Hernández
(Benemerita Universidad Autónoma de Puebla)
29/04/2015, 08:55
WG7 Future experiments
We study the prospect for observing the lightest and heavier CP-even
neutral Higgs bosons( ϕ= h and H) in their decays to flavor violating
bs¯ (with charge conjugation) at the proposed Large Hadron electron
Collider(LHeC), with center-of-mass energy approximately 1.296 TeV, in
the framework of the Two Higgs Doublet Model Type-III, assuming a
four-zero texture in the Yukawa matrices and a...
Maria Beatriz Gay Ducati
(UFRGS)
29/04/2015, 08:55
WG2 Small-x, Diffraction and Vector Mesons
Recent results for the coherent photoproduction of vector mesons psi(1S),
psi(2S) and Upsilon (1S) in the hadron-hadron and nucleus-nucleus collisions in the LHC energies are presented. Predictions for the rapidity distributions are obtained using the color dipole formalism and including saturation effects, expected to be relevant at high energies. Comparison is done to the J/psi and Psi(2S)...
Philipp Karl Jorg
(Albert-Ludwigs-Universitaet Freiburg (DE))
29/04/2015, 08:55
WG6 Spin Physics
A major part of the COMPASS-II program will be dedicated to the investigation of generalized parton distributions (GPDs)
and transverse momentum dependent parton distributions (TMDs), which aim for the most complete
description of the partonic structure of the nucleon.
GPDs are experimentally accessible via lepton-induced exclusive reactions, in particular
the Deeply Virtual Compton...
Dr
Marie Boër
(Institut de Physique Nucléaire d'Orsay)
29/04/2015, 08:55
WG1 Structure Functions and Parton Densities
Hard exclusive processes on the nucleon have been the subject of intense studies for the past 15 years. In the regime where the scattering amplitude is factorized into a hard and a soft part, such reactions provide access to Generalized Parton Distributions (GPDs). These quantities contain informations about the longitudinal momentum and the transverse spatial distributions of quarks and...
Serban Protopopescu
(Unknown)
29/04/2015, 08:55
WG5 Heavy Flavours
Measurements of the inclusive top quark pair production
cross sections in proton-proton collisions with the ATLAS detector at
the Large Hadron Collider are presented. The measurements are
performed requiring one or two electrons or muons in the final
state. Various experimental techniques are compared. The most precise
result requires opposite sign electrons and muons and uses the...
Ivan Sykora
(Comenius University (SK))
29/04/2015, 09:10
WG4 QCD and Hadronic Final States
Bose-Einstein correlations provide a unique opportunity for
detailed understanding of the space-time geometry of the hadronization
region, for determining the size and shape of the source from which
particles are emitted and for interpreting of quark confinement
effects. Bose-Einstein correlation lead to an enhancement of the
production of identical bosons close in phase space. The...
Nikolaos Kidonakis
(Kennesaw State University)
29/04/2015, 09:20
WG5 Heavy Flavours
I present a calculation of approximate N$^3$LO corrections from NNLL soft-gluon resummation for differential distributions in top-antitop pair production in hadronic collisions. I show that soft-gluon corrections are the dominant contribution to top-quark production and closely approximate exact results through NNLO. I show aN$^3$LO results for the total $t{\bar t}$ cross section, the...
Carlos Munoz Camacho
29/04/2015, 09:20
WG6 Spin Physics
Deeply Virtual Compton Scattering (DVCS) is the easiest reaction that probes the Generalized Parton Distributions (GPDs) of the nucleon. GPDs offer the exciting possibility of mapping the 3-D internal structure of protons and neutrons by providing a transverse image of the constituents as a function of their longitudinal momentum.
An extensive experimental program is currently pursued at...
Roberto Petti
(University of South Carolina (US))
29/04/2015, 09:20
WG7 Future experiments
The reference design of the near detector for the LBNE/F experiment is a high-resolution, low density
(about 0.1 g/cm^3) Fine-Grained Tracker (FGT), which, in conjunction with the high intensity and broad
energy range of the LBNE/F beam, will allow precise tests of fundamental interactions resulting
in a better understanding of the structure of matter.
Overall, FGT is expected to collect...
Cynthia Keppel
(Jefferson Lab)
29/04/2015, 09:20
Michael Murray
(University of Kansas (US))
29/04/2015, 09:20
WG2 Small-x, Diffraction and Vector Mesons
The nature of the initial state can be studied in photon-nucleus collisions at the LHC. Ultra-peripheral collisions (UPCs) of heavy ions involve long range electromagnetic interactions at impact parameters larger than twice the nuclear radius. At TeV energies, the strong electromagnetic field due to the coherent action of the Z=82 proton charges generates a large flux of photons, which can be...
Sandra Padula
(UNESP - Universidade Estadual Paulista (BR))
29/04/2015, 09:30
WG4 QCD and Hadronic Final States
Two-particle, quantum-statistical (Bose-Einstein) correlations are measured with the CMS experiment in pp collisions at 0.9, 2.76 and 7 TeV center-of-mass energies, as well as in pPb and peripheral PbPb collisions, respectively at 5.02 and 2.76 TeV center-of-mass energy per nucleon. The analysis is performed as a function of both the charged particle multiplicity and the average transverse...
Jaroslav Adam
(Czech Technical University (CZ))
29/04/2015, 09:45
WG2 Small-x, Diffraction and Vector Mesons
Ultra-relativistic heavy ions generate strong electromagnetic fields, which
offer the possibility to study gamma-gamma, gamma-nucleus and gamma-proton
processes at the LHC in ultra-peripheral Pb-Pb and p-Pb collisions (UPC).
Exclusive photoproduction of vector mesons is sensitive to
the gluon distribution of the interacting target (proton or nucleus).
The reactions allow one to study...
Prof.
Arie Bodek
(University of Rochester (US))
29/04/2015, 09:45
WG1 Structure Functions and Parton Densities
We present results from a high precision experimental study of the nuclear modification of the longitudinal ($\sigma_L$) and transverse ($\sigma_T$) structure functions of nucleons bound in nuclear targets. The origin of these modifications (commonly referred as as the EMC effect) is not fully understood. Our measurements of R= $\sigma_L / \sigma_T$ for nuclei ($R_A$) and for...
Mr
Maxime DEFURNE
(CEA)
29/04/2015, 09:45
WG6 Spin Physics
The deeply virtual $\pi^0$ production cross section can be decomposed according to the polarization of the virtual photon.
\begin{equation}
\frac{d\sigma}{dt}=\frac{d\sigma_T}{dt}+\epsilon \frac{d\sigma_L}{dt}+\sqrt{2\epsilon (\epsilon+1)}\frac{d\sigma_{TL}}{dt} \cos(\phi)+\epsilon \frac{d\sigma_{TT}}{dt} \cos(2\phi)
\end{equation}
where $\epsilon$ represents the degree of polarization of...
Rakitha Sanjeewa Beminiwattha
(urn:Google)
29/04/2015, 09:45
WG3 Electroweak Physics and Beyond the Standard Model
A new proposal to measure parity violating deep inelastic asymmetry (PVDIS) will provide a precision test of the Standard Model through an unique constraints on axial-vector neutral quark current couplings and a precision measurement of the weak mixing angle. We plan to measure the asymmetry to about $\rm 0.5 \% $ precision over the Bjoken x from 0.3 to 0.7 where the PV asymmetry is...
Christian Schwanenberger
(Deutsches Elektronen-Synchrotron (DE))
29/04/2015, 09:45
WG5 Heavy Flavours
The large centre-of-mass energy available at the
proton-proton collider LHC allows for the copious production of top
quark pairs in association with other final state particles at high
transverse momentum. The ATLAS experiment has measured several final
state observables that are sensitive to additional radiation in top
anti-top quark final states. Results on the top production...
Soumya Mohapatra
(State University of New York (US))
29/04/2015, 09:50
WG4 QCD and Hadronic Final States
Measurements of soft particle production have provided
valuable insight on properties of the evolution of the quark-gluon
plasma in Pb+Pb collisions at the LHC. In particular, measurements of
flow harmonics using the azimuthal angle distributions of low-pT
particles directly test hydrodynamic model descriptions of its
evolution. The large acceptance of the ATLAS detector enables...
Kazuhiro Tanaka
29/04/2015, 10:45
WG6 Spin Physics
The measurement of exclusive mesoproduction of lepton pair, $\pi^- p \to \ell^+ \ell^- n$, may be performed using the high-intensity pion beams at J-PARC in the near future. The leading hard exclusive amplitude for this process was obtained by E.R. Berger, M. Diehl, and B. Pire [Phys. Lett. B 523 (2001) 265] in terms of the partonic subprocess convoluted with the relevant nonperturbative...
Paolo Gunnellini
(Deutsches Elektronen-Synchrotron (DE))
29/04/2015, 10:45
WG4 QCD and Hadronic Final States
A measurement of the underlying event activity in pp collisions is performed using events with a leading charged particle jet produced at central pseudorapidities and of transverse momentum in the range of 1 to 100 GeV. The underlying event activity is measured independently in the two halves of the transverse region with the maximum as well as minimum activities. The results obtained from pp...
Vincent Sulkosky
(MIT)
29/04/2015, 10:45
WG3 Electroweak Physics and Beyond the Standard Model
We report on a measurement of parity-violating (PV) asymmetries in the
deep inelastic scattering (DIS) and nucleon resonance regions using
inclusive scattering of longitudinally polarized electrons from
unpolarized deuterons. The effective weak couplings $C_{2q}$ are
accessible through these PV-DIS asymmetries. This measurement of the
PV asymmetry yielded a determination of $2C_{2u} -...
Dr
Gabriel Niculescu
(James Madison University)
29/04/2015, 10:45
WG1 Structure Functions and Parton Densities
The Jefferson Lab. experiment BONuS used a novel spectator-tagging technique to measure the inclusive electron-free neutron scattering cross section and extract the F2 structure function. This data was used to reconstruct moments of F2 in the three prominent resonance region, as well as the moments integrated over the entire resonance region.
Comparisons of the experimental results with...
Prof.
Thomas Ullrich
(BNL)
29/04/2015, 10:45
WG2 Small-x, Diffraction and Vector Mesons
The demand for detailed simulations of diffractive processes at an electron-ion collider (EIC) required the realization of an event generator that described these processes not only in ep but especially also in eA. Since gluon saturation is one of the key topics in eA collisions at an EIC, the generator was also required to be able to describe these non-linear QCD phenomena but also be able...
Franco Grancagnolo
(INFN Lecce)
29/04/2015, 10:45
WG7 Future experiments
The Mu2e Experiment at Fermilab will search for coherent, neutrinoless
conversion of muons into electrons in the field of a nucleus with a
sensitivity improvement of a factor of 10,000 over previous experiments.
Such a lepton flavor-violating reaction probes new physics at a scale
inaccessible with direct searches at either present or planned high energy
colliders. The experiment both...
Jasone Garay Garcia
(Deutsches Elektronen-Synchrotron (DE))
29/04/2015, 10:45
WG5 Heavy Flavours
Measurements of the inclusive top quark pair production cross section at 7 TeV and 8 TeV are presented, performed using CMS data collected in 2011 and 2012. The total cross section is measured in the lepton+jets, dilepton and fully hadronic channels, including the tau-dilepton and tau+jets modes. Indirect constraints on both the top quark mass and alpha_s are obtained through their relation to...
Joseph Michael Izen
(University of Texas at Dallas (US))
29/04/2015, 11:10
WG5 Heavy Flavours
The existence of the X(3872) suggests the presence of its bottomonium counterpart X_b. Search for X_b with the ATLAS experiment
in several final states, including Upsilon pi pi, is presented.
Nadia Fomin
(University of Tennessee)
29/04/2015, 11:10
WG1 Structure Functions and Parton Densities
Since the discovery of the EMC effect over 30 years ago, it’s been of great theoretical interest and studied in several experimental measurements. No unified picture arose to explain the underlying cause of per nucleon structure function modification in nuclei. Precise measurements on light nuclei from JLab’s 6 GeV era revitalized this research by showing that traditional A or density...
Pawel Sznajder
(National Centre for Nuclear Research (PL))
29/04/2015, 11:10
WG6 Spin Physics
Hard exclusive leptoproduction of mesons on nucleons has played an important role in studies of the hadron structure and recently gained a renewed interest as it allows an access to generalised parton distributions (GPDs). The GPDs provide a novel and comprehensive description of the nucleon partonic structure and contain a wealth of new information. In particular, the GPDs give a description...
Nataliia Kovalchuk
(Hamburg University (DE))
29/04/2015, 11:10
WG2 Small-x, Diffraction and Vector Mesons
The exclusive deep inelastic electroproduction of $\psi(2S)$ and $J/\psi$ has been studied with the ZEUS detector at HERA in the kinematic range $2 \le Q^2 \le 80$ GeV$^2$, $30 \le W \le 210$ GeV and $|t| \le 1$ GeV$^2$, where $Q^2$ is the photon virtuality, $W$ is the photon-proton centre-of-mass energy and $t$ is the squared four-momentum transfer at the proton vertex. The data for $2 \le...
Claire Gwenlan
(University of Oxford (GB))
29/04/2015, 11:10
WG4 QCD and Hadronic Final States
The measurement of production properties of mesons and
baryons at sqrt(s)=7 TeV using pp collision data collected with the
ATLAS experiment is presented and compared to predictions. Particle
distributions sensitive to the underlying event in proton-proton
collisions have also been measured with the ATLAS detector at the LHC
at 7 TeV centre-of-mass energy. Various and complementary...
Bruno Angelucci
(University of Glasgow (GB))
29/04/2015, 11:10
WG3 Electroweak Physics and Beyond the Standard Model
The rare decays K+ ->pi+ nu nu are excellent processes to make tests of new physics at the highest scale complementary to LHC thanks to their theoretically cleaness.
The NA62 experiment at CERN SPS aims to collect of the order of 100 events in two years of data taking, keeping the background at the level of 10%.
Part of the experimental apparatus has been commissioned during a technical run...
Dave Gaskell
(Jefferson Lab)
29/04/2015, 11:10
WG3 Electroweak Physics and Beyond the Standard Model
The weak charge of the proton, $Q^p_{W}$, has been measured precisely for
the first time at Jefferson Lab. The running of the weak mixing angle
($\sin^2\theta_W/2$), and thus $Q^p_{W}$, from the $Z$-pole to the low
momentum transfers of this measurement is potentially sensitive through
radiative corrections to new physics beyond the Standard Model.
The Q-Weak experiment ran in Hall...
Dr
Yorito Yamaguchi
(Stony Brook University)
29/04/2015, 11:30
WG3 Electroweak Physics and Beyond the Standard Model
A "dark photon" has been proposed as a hypothetical U(1) gauge boson in the dark sector. The dark photon is weakly coupled with ordinary photons and can explain several experimental results which can not be described by the standard model such as the excess of high energy positrons in cosmic rays and the muon g-2 anomaly. The PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) has...
Ronan James Wallace
(University College Dublin (IE))
29/04/2015, 11:35
WG2 Small-x, Diffraction and Vector Mesons
The recent LHCb results on central exclusive production are presented.
Dr
Matthew Posik
(Temple University)
29/04/2015, 11:35
WG1 Structure Functions and Parton Densities
Over the past several years the STAR experiment at RHIC has been contributing to our understanding of the proton structure. Through proton-proton collisions, STAR is well equipped to measure the e$^{\pm}$ leptonic decays of $W^{\pm}$ bosons in the mid-rapidity region (-1.1 $\le \eta \le $ 1.1) at $\sqrt{s}$ = 500/510 GeV. The $W$ cross section ratio ($W^+/W^-$) is sensitive to unpolarized $u$,...
You-Hao Chang
(National Taiwan University (TW))
29/04/2015, 11:35
WG4 QCD and Hadronic Final States
Double parton scattering is measured in different channels using the CMS experiment at the CERN LHC. Data from pp collisions collected at 7 and 8 TeV center-of-mass energy are used. Several final states are investigated to identify and measure the signature of double parton scattering in inelastic events. Parameters are extracted from the data that are suited in an optimal way to distinguish...
Paolo Gunnellini
(Deutsches Elektronen-Synchrotron (DE))
29/04/2015, 11:35
WG5 Heavy Flavours
Measurements of the differential cross sections for the production of at least four jets, two of them initiated by b-quarks, in proton-proton collisions are presented as a function of the transverse momentum pt and pseudorapidity eta, together with the correlations in azimuthal angle and the pt balance among the jets. The data sample was collected in 2010 at a center-of-mass energy of 7 TeV...
Christian Schwanenberger
(Deutsches Elektronen-Synchrotron (DE)),
Christian Schwanenberger
(University of Manchester (GB))
29/04/2015, 11:35
WG7 Future experiments
An intense electron beam, when combined with the LHC (LHeC) or, in the further future, the FCC hadron beams (FCC-he), can lead to a unique, energy frontier DIS collider at CERN. Recent measurements at the LHC and the Tevatron have lead to a very precise determination of m_top with, however, sizeable theoretical and phenomenological uncertainties inherent to hadron-hadron scattering. High...
Andreas Metz
(Temple University, Philadelphia)
29/04/2015, 11:35
WG6 Spin Physics
In this talk we will address new theoretical work on twist-3 spin asymmetries for the process l + N -> h + X, for which recent data have been obtained. Specifically, we will address the longitudinal-transverse double-spin asymmetry A_LT, and the transverse single-spin asymmetry A_N for a polarized final state hyperon. Open questions and future prospects will be mentioned as well.
Mr
Varun Vaidya
(Carnegie Mellon University)
29/04/2015, 11:50
WG3 Electroweak Physics and Beyond the Standard Model
We systematically compute the annihilation rate for neutral winos into the
final state $\gamma + X$, including all leading radiative corrections.
This includes both the Sommerfeld enhancement (in the decoupling limit for
the Higgsino) and the resummation of the leading electroweak double
logarithms. Adopting an analysis of the HESS experiment, we place
constraints on the mass as a...
Prof.
Pavel Nadolsky
(Southern Methodist University)
29/04/2015, 12:00
WG1 Structure Functions and Parton Densities
I review two methods for combination of PDF+QCD coupling uncertainties for LHC observables, based on meta-parametrizations of PDFs and compressed Monte Carlo replicas. The methods estimate combined PDF uncertainties using input PDF ensembles from several groups. They offer alternatives to the current PDF4LHC prescription for the combination of PDF uncertainties, and combine the PDFs at the...
Carlos Granados
(Uppsala University)
29/04/2015, 12:00
WG6 Spin Physics
The nucleon's peripheral transverse charge and magnetization densities are computed in chiral effective field theory in the light--front formulation. The densities are represented in first--quantized form, as overlap integrals of chiral light--front wave functions describing
the transition of the nucleon to soft pion--nucleon intermediate states. The new representation leads to a simple...
Dr
Michael Albrow
(Fermi National Accelerator Laboratory)
29/04/2015, 12:00
WG2 Small-x, Diffraction and Vector Mesons
We measure exclusive pi+pi- production in proton-antiproton collisions at center-of-mass energies sort(s) = 0.9 and 1.96 TeV in the Collider Detector at Fermilab. We select events with two oppositely charged particles, assumed to be pions, with pseudorapidity
|eta| < 1.3 and with no other particles detected in |eta| < 5.9. We require the pi+pi- system to have rapidity |y| < 1.0. The...
Matthew Wing
(UCL)
29/04/2015, 12:00
WG5 Heavy Flavours
The photoproduction of $D^{*\pm}$ mesons has been measured with the ZEUS detector at HERA at three different $ep$ centre-of-mass energies, $\sqrt{s}$, of 318, 251 and 225\,GeV. For each data set, $D^{*\pm}$ mesons were required to have transverse momentum, $p_T^{D^*}$, and pseudorapidity, $\eta^{D^*}$, in the ranges $1.9 < p_T^{D^*} < 20$ GeV and $|\eta^{D^*}|<1.6$. The events were required...
Matthew Low
(University of Chicago)
29/04/2015, 12:10
WG3 Electroweak Physics and Beyond the Standard Model
In weak-scale theories of beyond the Standard Model physics, particle dark matter is ubiquitous. This is for good reason as observations point towards TeV-scale dark matter with weak-strength interactions. One promising way to search of this type of dark matter is via production at hadron colliders. In this talk I will discuss strategies for searching for dark matter at colliders and...
Giovanni Ossola
(City University of New York (US))
29/04/2015, 14:00
WG4 QCD and Hadronic Final States
This talk will focus on the automation of higher-order QCD calculations.
Prof.
Simonetta Liuti
(University of Virginia)
29/04/2015, 14:00
WG1 Structure Functions and Parton Densities
I will discuss the application of an alternative type of neural network, the Self-Organizing Maps (SOMs), to extract parton distribution functions from various hard scattering processes. SOMs provide a complementary algorithm to NNPDFs yielding a parametrization that is free from the bias implicit in choosing specific analytic forms. At the same time it enables us to extrapolate to...
Dr
Andreas Jung
(Fermilab)
29/04/2015, 14:00
WG5 Heavy Flavours
Measurements of several top-quark properties are presented, obtained from the CMS data collected in 2011 and 2012 at centre-of-mass energies of 7 and 8 TeV. The results include measurements of the top pair charge asymmetry, the W helicity in top decays, the top quark charge, and of the ttbar spin correlation and the search for anomalous couplings. The results are compared with predictions from...
Anne Norrick
(The College of William and Mary)
29/04/2015, 14:00
WG7 Future experiments
Neutrino Nucleon Deep Inelastic Scattering (DIS) events in MINERvA provide a probe into the structure of nucleons within the nucleus that is different, due to the axial-vector component, than charged-lepton nucleon interactions. The MINERvA experiment is stationed in the Neutrinos from the Main Injector (NuMI) beam line at Fermi National Accelerator Laboratory. With the recent increase in...
Michael Lublinsky
29/04/2015, 14:00
WG2 Small-x, Diffraction and Vector Mesons
We present a construction of an effective high energy QCD Hamiltonian at NLO accuracy. This Hamiltonian is an NLO extension of the JIMWLK LO Hamiltonian, known to incorporate BFKL dynamics with gluon saturation phenomena. We are to demonstrate how the conformal symmetry is realized within the NLO JIMWLK.
Hari Guragain
(PHENIX Collaboration)
29/04/2015, 14:00
WG6 Spin Physics
One of the major objectives of the RHIC spin program at BNL is the
measurement of the gluon helicity contribution, $\Delta G$, to the proton spin via
measuring the double longitudinal spin asymmetry ($A_{LL}$) in various
channels. In PHENIX (Pioneering High Energy Nuclear Interaction
eXperiment) the $A_{LL}$ in $\pi^{0}$, $\eta$, $J/\psi$ etc. are measured in wide...
Andrey Grabovskiy
(Budker Institute of Nuclear Physics (RU))
29/04/2015, 14:25
WG2 Small-x, Diffraction and Vector Mesons
The next to leading order low x evolution equation for the next after the dipole operator will be discussed.
Dr
Xuan Li
(Temple University)
29/04/2015, 14:25
WG6 Spin Physics
Inclusive jet- and di-jet productions in polarized p+p collisions at $\sqrt{s} = 200$ GeV and $\sqrt{s} = 500$ GeV provide powerful probes to study gluons inside the proton. Inclusive jet production is sensitive to the integral of the gluon distribution over a broad range of $x$. Di-jet production provides better sensitivity to $x$ dependence of gluons. The Solenoidal Tracker at RHIC (STAR)...
Kun Liu
(urn:Google)
29/04/2015, 14:25
WG1 Structure Functions and Parton Densities
Fermilab E906/SeaQuest is a fixed-target dimuon experiment using the 120 GeV proton beam from the Fermilab Main Injector. We have completed the first physics run in 2014 and continue collecting high statistic data samples of p+p, p+d, p+C, p+Fe and p+W collisions. E906 measures J/Psi, Psi’ and Drell-Yan yeilds in the dimuon channel over a wide range of kinematic coverages, which is optimal for...
Xinchun Tian
(Univesrity of South Carolina)
29/04/2015, 14:25
WG7 Future experiments
The reference design of the near detector for the LBNE/F experiment is a high-resolution Fine-Grained Tracker (FGT)
capable of precisely measuring all four species of neutrinos: νμ, νe, ν ̄μ and ν ̄e. The goals of the FGT is to
constrain the systematic errors, below the corresponding statistical error in the far detector,
for all oscillation studies; and to conduct a panoply of precision...
Alex Baudouin E Van Spilbeeck
(Universiteit Antwerpen Physics Department)
29/04/2015, 14:25
WG4 QCD and Hadronic Final States
Several measurements of QCD jets are presented as performed at different center-of-mass energies with the CMS experiment. By extending the measurement into the forward phase space and also towards low-pT the sensitivity to new features of QCD is maximised. The simultaneous observation of several jets in the same event is exploited to study for example the angular correlations of Mueller...
Sven Menke
(Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (D)
29/04/2015, 14:30
WG5 Heavy Flavours
The latest measurements of the top quark mass using the
ATLAS experiment are presented. A measurement based on a
multi-dimensional template fit that can constrain the uncertainties on
the energy measurements of jets is presented and combined with a
measurement using dilepton events. In addition, novel measurements
aiming to measure the mass in a well-defined scheme are
presented. These...
Dr
Giovanni Chirilli
29/04/2015, 14:50
DEVIKA S GUNARATHNE
(urn:Google)
29/04/2015, 14:50
WG6 Spin Physics
Devika Gunarathne for the STAR Collaboration
Temple University, Philadelphia, PA, USA
Email: devika.gunarathne@temple.edu
$W^\pm$ boson production in longitudinally polarized $p+p$ collisions provides unique and clean access to the individual helicity polarizations of $u$ / $d$ quarks and anti-quarks. Due to maximal violation of parity, $W$ bosons couple to left-handed quarks and...
Tomas Jezo
(Milano Bicocca)
29/04/2015, 14:50
WG4 QCD and Hadronic Final States
We discuss the subject of matching the NLO QCD corrections to the parton shower for processes mediated by coloured resonances. In order to perform precise realistic simulations of the production of resonances their decay must be included. In current frameworks for NLO+PS simulations, however, problems arise when generating the radiation from the decay of the resonance, especially for narrow...
Annarita Buonaura
29/04/2015, 14:50
WG7 Future experiments
SHIP is a new general purpose fixed target facility, proposed at the CERN SPS accelerator.
In its initial phase the 400GeV proton beam will be dumped on a heavy target with the aim of integrating $2\times 10^{20}$ pot in 5 years.
A dedicated detector downstream the target will allow to probe a variety of models with light long-lived exotic particles and masses below O(10)...
Prof.
Arie Bodek
(University of Rochester (US))
29/04/2015, 14:50
WG1 Structure Functions and Parton Densities
We show that measurements of the forward-backward charge asymmetry ($A_{FB}(M)$) of Drell-Yan dilepton events produced at hadron colliders can be used to constrain Parton Distribution Functions (PDFs). PDF uncertainties are the dominant systematic error in the extraction of of electroweak parameters from hadron collider data. These parameters include the electroweak mixing angles...
Huanzhao Liu
(SMU)
29/04/2015, 15:00
WG5 Heavy Flavours
We present measurements of the mass of the top quark using the full D0 Run II data set corresponding to an integrated luminosity of 9.7 fb−1. Results in the dilepton and lepton+jets decay channel of the top quark will be discussed. In the dilepton decay channel we employ the neutrino weighting technique based on the expected neutrino rapidity distribution, whereas in the lepton+jets channel we...
Prof.
Alan Martin
(IPPP Durham),
Lucian Harland-Lang
(University College London), Mr
Patrick Motylinski
(UCL London), Prof.
Robert Samuel Thorne
(University College London (UK))
29/04/2015, 15:15
WG1 Structure Functions and Parton Densities
We present the MMHT2014 PDFs, an update of the previous major release in the
same framework, i.e. MSTW2008. We discuss the changes in both the central values
and uncertainties in the PDFs due to changes in theoretical procedures and the impact of new, largely LHC data-sets. We note, however, that changes in predictions are
rather small. We discuss the correlation between the PDFs and the...
Mike Beaumier
(urn:Google)
29/04/2015, 15:15
WG6 Spin Physics
Over the past ten years, the RHIC spin program has deepened our knowledge of proton spin structure as part of a worldwide effort to solve the proton spin puzzle. While we now precisely understand the contribution of valence quarks to the total proton spin, large uncertainties still dominate the predictions describing the contributions of the sea of anti-up and anti-down quarks. In 2013, PHENIX...
Dr
Tuomas Lappi
(Jyvaskyla U)
29/04/2015, 15:15
Simona Malace
29/04/2015, 15:15
WG7 Future experiments
The Jefferson Lab 12 GeV upgrade ensures the continuation of experimental programs dedicated to the understanding of nuclear medium modifications of the quark and gluon structure of the nucleon. The origin of the EMC effect is still a matter of controversy thirty years after its initial observation. The path forward in achieving a conclusive understanding of how the medium modifications of the...
Steve Guy Muanza
(CPPM, Aix-Marseille Université, CNRS/IN2P3 (FR))
29/04/2015, 15:20
WG5 Heavy Flavours
We propose a novel method for an indirect measurement of the mass of final states
produced through charged current processes at the LHC. This method is based upon the process integral charge asymmetry. First, the theoretical prediction of the integral charge asymmetry and its related uncertainties are studied through parton level cross sections calculations. Then, the experimental extraction...
Dr
Nobuo Sato
(Jefferson Lab)
29/04/2015, 16:15
WG6 Spin Physics
A new global QCD analysis of spin-dependent PDFs has been performed
by the JAM (Jefferson Lab Angular Momentum) Collaboration, including
all available data on inclusive spin structure functions from CERN,
SLAC, DESY and JLab. In particular, we explore the impact of recent
high-precision JLab data at high x and low *Q*^2 on the determination
of large-*x* PDFs and the extraction of higher...
Matthias Saimpert
(CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR))
29/04/2015, 16:15
WG4 QCD and Hadronic Final States
Measurements of the inclusive photon production performed by
the ATLAS collaboration are reported in different fiducial regions
covering a wide acceptance. Comparisons to the data of next-to-leading
order QCD calculations MCFM and JetPhox with different PDFs are
presented. The theoretical uncertainties, including scale, strong
coupling, and PDF uncertainties are evaluated. The cross...
Martin Hentschinski
(Institute for Nuclear Science, UNAM)
29/04/2015, 16:15
WG1 Structure Functions and Parton Densities
We revive the idea of using physical anomalous dimensions in the QCD scale evolution of deep-inelastic structure functions and their scaling violations and present a detailed phenomenological study of its applicability up to NNLO. In particular we are interested in the use of physical DGLAP evolution as a tool to detect possible deviations from linear DGLAP evolution at small x which signal...
Madrigal Martínez José Daniel
(IPhT CEA Saclay)
29/04/2015, 16:15
WG2 Small-x, Diffraction and Vector Mesons
Starting at NLO, the BFKL-BK evolution in high-energy QCD develops severe convergence problems. The most important source for this behavior can be traced down to large double collinear logarithms. We show via explicit computation of Feynman diagrams that corrections enhanced by double logs correspond to soft gluon emissions strongly ordered in lifetime, while other potential contributions...
Kevin Finelli
(University of Sydney (AU))
29/04/2015, 16:15
WG5 Heavy Flavours
Measurements of single top-quark production in proton proton
collisions at 7 and 8 TeV are presented. In the leading order process,
a W boson is exchanged in the t-channel. The single top-quark and
anti-top total production cross sections, their ratio, as well as a
measurement of the inclusive production cross section is presented. In
addition, a measurement of the production cross...
Enrico Bothmann
(II. Physikalisches Institut, Universitaet Goettingen)
29/04/2015, 16:40
WG4 QCD and Hadronic Final States
The determination of theoretical error estimates and PDF/$\alpha_s$-fits require
fast evaluations of differential cross sections for varied QCD input parameters.
These include PDFs, the strong coupling constant $\alpha_S$
and the renormalization and factorization scales.
Beyond leading order QCD, a full dedicated calculation for each set of parameters
is often too time-consuming,...
Zachary Snyder
(Penn State)
29/04/2015, 16:40
WG1 Structure Functions and Parton Densities
We demonstrate the mathematical formalism for the construction of the consistent initial
conditions for the double parton distribution functions in the collinear approximation.
The initial conditions within this framework have an important property that they satisfy exactly simultaneously both the momentum sum rules and the quark sum rules and are at the same time related to the single...
Andrey Tarasov
(Jefferson Lab)
29/04/2015, 16:40
WG2 Small-x, Diffraction and Vector Mesons
A TMD factorization generalizes the usual concept of parton density by allowing PDFs to depend on intrinsic transverse momenta in addition to the usual longitudinal momentum fraction variable. The available analysis of TMD evolution is mostly restricted to the evolution of quark TMDs at moderate x. However at high collider energies the majority of produced particles will be small-x gluons. In...
Nilanga Liyanage
(University of Virginia (US))
29/04/2015, 16:40
WG6 Spin Physics
Jefferson lab is well known for its high quality, high polarization electron beam. Jefferson lab
polarized beam, combined with the range of polarized proton, deuteron and 3He targets in
experimental halls A, B and C, allows for high precision exploration of spin structures of both
proton and neutron in the low to intermediate Q2 region. The impact of Jefferson lab precision spin
data is...
Nikolaos Kidonakis
(Kennesaw State University)
29/04/2015, 16:45
WG5 Heavy Flavours
I present results from recent high-order calculations for the production of electroweak bosons and top quarks. In particular, I discuss W and Z boson production at large transverse momentum, charged Higgs production, FCNC top production, and single-top production. Theoretical predictions which include higher-order soft-gluon corrections are presented for total cross sections and differential...
Harleen Dahiya
(Dr. B.R. Ambedkar National Institute of Technology)
29/04/2015, 17:05
WG1 Structure Functions and Parton Densities
Electromagnetic form factors obtained from the overlap of light front wave functions (LFWFs) have been used to study the transverse densities of charge and magnetization. The calculations have been carried out to develop a relation between the charge distribution of the quarks inside nucleon in the transverse coordinate space as well as in the impact parameter space. The anomalous...
Dr
Peter Bussey
(University of Glasgow)
29/04/2015, 17:05
WG2 Small-x, Diffraction and Vector Mesons
Using data from HERA, the ZEUS collaboration present measurements of the diffractive production of isolated ("prompt") photons in photoproduction, with and without a jet. First cross sections are evaluated for centrally produced photons with jets as a function of the photon and jet transverse energy and pseudorapidity, and also for the fraction of incoming photon energy imparted to the...
Tomas Kasemets
(DESY)
29/04/2015, 17:05
WG6 Spin Physics
We discuss the impact of double parton scattering at the LHC. In particular we focus on the impact of polarization, arising from the spin correlations between two partons inside an unpolarized proton. We demonstrate that the effects can be large in certain kinematic regions and processes and compare our results to data. We further discuss angular asymmetries and similarities as well as...
Dr
Mirko Serino
(Institute of Nuclear Physics, PAN, Cracow)
29/04/2015, 17:05
WG4 QCD and Hadronic Final States
We use an extension of the Britto-Cachazo-Feng-Witten (BCFW) recursion relation to evaluate analytically tree-level 5-point matrix elements of two fermions and three gluons with one of the partons off the mass-shell, while preserving gauge invariance.
These amplitudes find their domain of application within the high-energy factorisation (or TMD-factorisation) framework, which requires...
Marcin Chrzaszcz
(University of Zurich (CH))
29/04/2015, 17:10
WG5 Heavy Flavours
We present a selection of recent results on CP violation effects measured with a sample of about 471 million B-Bbar pairs collected by the BaBar detector.
They include a measurement of CP and T asymmetries in the B0-B0bar mixing process by using inclusive dilepton samples, and and a Dalitz plot analysis of the charmless decay B+ -> Ks pi+ pi0, where the first evidence of direct CP...
Aditi Mukhopadhyay
(urn:Google)
29/04/2015, 17:30
WG4 QCD and Hadronic Final States
We present the current status of the comparisons with the respective data of the predictions of our approach of exact amplitude-based resummation in quantum field theory as applied to precision QCD calculations as needed for LHC physics. The agreement between the theoretical predictions and the data exhibited continues to be encouraging.
Cristian Pisano
(Vrije Universiteit Amsterdam)
29/04/2015, 17:30
WG6 Spin Physics
We consider Higgs plus jet production as a process that is sensitive to the linear polarization of gluons inside the unpolarized protons of the LHC. The leading order expressions for the transverse momentum distribution of the Higgs plus jet pair are calculated in terms of transverse momentum dependent quark and gluon distributions. Both angular independent and azimuthal angular dependent...
Tamsin Nooney
(University of London (GB))
29/04/2015, 17:35
The large amount of Heavy Flavour data collected by the ATLAS experiment is potentially sensitive to New Physics, which may be found in the mixing of B meson states, or through processes that are naturally suppressed in the Standard Model. We present the most recent results on the measurement of the decay of the Bs into J/psi phi based on full data collected in LHC Run-1 and with updated...
Thomas Mastrianni Perry
(University of Wisconsin (US))
29/04/2015, 18:00
WG3 Electroweak Physics and Beyond the Standard Model
The production of vector bosons (V = W, Z or γ) in association with jets is a stringent test of perturbative QCD and is a background process in searches for new physics. Total and differential cross-section measurements of vector bosons produced in association with jets and heavy flavour quarks in proton-proton collisions at the LHC are presented. The measurements are compared to next-to...
Alexandre Beaulieu
(University of Victoria)
30/04/2015, 08:30
WG3 Electroweak Physics and Beyond the Standard Model
We report on the latest searches for low mass states predicted in several
New Physics models performed with the data collected by the BABAR detector.
These include: searches for the so-called dark photons in e+e- annihilations (e+e- -> gamma A’, A’ -> e+e-, mu+mu-), and for long-lived particles motivated by recent astrophysical observations; searches for non-standard pi0-like particle...
Anna Stasto
(Penn State)
30/04/2015, 08:30
WG2 Small-x, Diffraction and Vector Mesons
We construct a theoretical framework to match the formulas for forward inclusive hadron productions in pA collisions in the small-x saturation formalism and collinear factorization. The small-x calculation can be viewed as a power series in Q2s/k2⊥, in which the collinear factorization result corresponds to the leading term. At high transverse momentum, the subleading correction terms are...
Feng Yuan
(LBNL)
30/04/2015, 08:30
WG4 QCD and Hadronic Final States
In this talk, we will present our recent theoretical calculations of all order soft gluon resummation for dijet azimuthal angular correlations at the hadron colliders. The relevant coefficients for the Sudakov resummation factor, the soft and hard factors, are calculated. The theory predictions agree well with the experimental data from D0 Collaboration at the Tevatron, ATLAS and CMS...
Zhihong Ye
(Duke University)
30/04/2015, 08:30
WG7 Future experiments
(for the SoLID Collaboration) With the Jefferson Lab 12 GeV electron beam and the proposed Solenoidal Large Intensity Device (SoLID) in Hall A, several newly approved experiments will perform measurements of both the single and double spin asymmetries via semi-inclusive deep inelastic scattering (SIDIS) from polarized 3He ("neutron") and proton targets. The large acceptance and high luminosity...
Nathaniel Joseph Pastika
(Baylor University (US))
30/04/2015, 08:50
WG3 Electroweak Physics and Beyond the Standard Model
The origin of neutrino mass has been a longstanding question in high energy particle physics. One possible solution arises through the seesaw mechanism if neutrinos have a Majorana mass term. The most conclusive proof of Majorana neutrinos may be their detection from direct production of heavy right-handed neutrinos at the LHC. Limits on the existence of heavy right-handed neutrinos are placed...
Tolga Altinoluk
(Universidade de Santiago de Compostela)
30/04/2015, 08:55
WG2 Small-x, Diffraction and Vector Mesons
We present a new method to systematically calculate corrections to the eikonal approximation in the background field formalism. We calculate the subleading power-suppressed corrections due to the finite width of the target to first and second orders. The method is of generic applicability. As a first example, we study both polarized and unpolarized gluon production in pA collisions.
Leonard Apanasevich
(University of Illinois at Chicago (US))
30/04/2015, 08:55
WG4 QCD and Hadronic Final States
We present recent jets results from CMS at a centre of mass energy of 7 and 8 TeV. The impact of those data on the precise measurement of the QCD parameters is studied.
Dr
Markus Diefenthaler
(University of Illinois at Urbana-Champaign)
30/04/2015, 08:55
WG7 Future experiments
The SeaQuest experiment at Fermilab continues a series of Drell-Yan measurements to explore the antiquark content of the nucleon and to study the modifications to the nucleon structure when the nucleon is embedded into a nuclei. To extend existing measurements to larger values of Bjorken-x, a 120 GeV proton beam extracted from Fermilab’s main injector is used, resulting in 50 times more...
Collaboration H1 and ZEUS
(DESY),
Gerhard Immanuel Brandt
(Berkeley Lab (US))
30/04/2015, 08:55
An extendend QCD analysis of the new combined inclusive HERA was performed at NLO, also including HERA data on jet and charm production. This enables the simultaneous measurement of parton distribution functions and the strong coupling using data from HERA alone. The strong coupling is measured to be alpha_s(M_Z0) = 0.1182 ±0.0008(exp) ±0.0005(model/param.) ±0.0012(hadronisation)...
Xiaowen Lei
(University of Arizona (US))
30/04/2015, 09:07
WG3 Electroweak Physics and Beyond the Standard Model
Given that the Standard Model is very successful in
describing the nature and no clue is found on the scale of new
physics, signature-based search covering a wide range of final states
and topologies has been more important nowadays. Searches for
fermionic top/bottom quark partners, referred to as vector-like
quarks, have been performed in various final states with leptons, jets
and...
Douglas Wertepny
(The Ohio State University)
30/04/2015, 09:20
WG2 Small-x, Diffraction and Vector Mesons
The classical single-gluon production amplitude in nucleus-nucleus collisions
including the first saturation correction in one of the nuclei (the projectile) while keeping multiple-rescattering (saturation) corrections to all orders in the other nucleus (the target) is presented.
We expand one of the two nuclei up to two Wilson lines (i.e only two nucleons interact in the projectile...
Camille Belanger-Champagne
(McGill University (CA))
30/04/2015, 09:20
WG4 QCD and Hadronic Final States
The measurements of the production cross sections of inclusive, di- and tri-jet events probe the dynamics of QCD and can constrain the parton proton structure. Double-differential cross sections are measured and compared to expectations based on next-to-leading order QCD calculations as well as to next-to-leading order Monte Carlo simulations. The study of di-jet systems with a veto on...
Pedro Jimenez-Delgado
(Jefferson Lab), Prof.
Tim Londergan
(Indiana University),
Wally Melnitchouk
(Jefferson Lab)
30/04/2015, 09:20
Francesco Romeo
(Chinese Academy of Sciences (CN))
30/04/2015, 09:27
WG3 Electroweak Physics and Beyond the Standard Model
Final states with a pair of particles are sensitive to many models beyond the Standard Model (SM) and allow for a clean search for both new narrow resonances and broad deviations from SM predictions. The most recent results from searches with dijet, dileptons, and leptons plus missing transverse energy are presented using 20 fb-1 of pp collision data collected by the CMS detector with sqrt(s)...
Dr
Daniel Hayden
(Michigan State University (US))
30/04/2015, 09:44
WG3 Electroweak Physics and Beyond the Standard Model
Many new physics scenarios beyond the Standard Model predict
the presence of narrow or broad resonances decaying to a pair of
fermions (light and heavy quarks, charged leptons and neutrinos) or
bosons (gammagamma, WW, WZ, ZZ and HH). The high-mass resonant
production of top-quark or vector boson pairs is also a good benchmark
process for boosted top and massive boson tagging. This...
elke-caroline Aschenauer
(BNL)
30/04/2015, 09:45
WG7 Future experiments
Our understanding of the structure of nucleons is described by the properties and
dynamics of quarks and gluons in the theory of quantum chromodynamics. With advancements in theory and the development of phenomenological tools we are preparing for the next step in subnuclear tomographic imaging at a future electron-ion collider. High center-of-mass energies ($\sqrt{s}\approx 45 - 150$ GeV) in...
Ringaile Placakyte
(Deutsches Elektronen-Synchrotron (DE))
30/04/2015, 09:45
WG4 QCD and Hadronic Final States
Inclusive jet, dijet and trijet differential cross sections are measured in neutral current deep-inelastic scattering for exchanged boson virtualities 150 < Q^2 < 15000 GeV^2 using the H1 detector at HERA. The data were taken in the years 2003 to 2007 and correspond to an integrated luminosity of 351 pb^{-1}. Double differential Jet cross sections are obtained using a regularised unfolding...
Feng Yuan
(LBNL)
30/04/2015, 09:45
WG2 Small-x, Diffraction and Vector Mesons
In this talk, we will discuss the theory developments on the next-to-leading order calculation for forward hadron production in pA collisions in the small-x factorization framework. In particular, we emphasize the matching between this calculation and the collinear factorization calculation at large transverse momentum. The small-x calculation can be viewed as a power series in $Q_s^2/k_T^2$,...
Paul Jonathan Turner
(University of Illinois at Chicago (US))
30/04/2015, 10:01
WG3 Electroweak Physics and Beyond the Standard Model
In many models of physics beyond the Standard Model the coupling of new physics to third generation quarks is enhanced. A search is presented for resonant top quark pair production. The full dataset recorded with the CMS detector in proton-proton collisions at a centre-of-mass energy of 8 TeV is used. The search is performed by measuring the invariant mass distribution of the top-quark pair...
Daekyoung Kang
(LANL)
30/04/2015, 10:45
WG4 QCD and Hadronic Final States
Event shapes provide a key method of measuring jets in DIS. This was done successfully by H1 and ZEUS and compared with theoretical calculations with next-to-leading-logarithmic (NLL) resummation.
We will present a high precision calculation of a event shape called DIS thrust, with next-to-next-to-next-to-leading-logarithmic resummation and a rigorous treatment of hadronization corrections....
Claire Gwenlan
(University of Oxford (GB))
30/04/2015, 10:45
WG7 Future experiments
An intense electron beam, when combined with the LHC (LHeC) or, in the further future, the FCC hadron beams (FCC-he), can lead to a unique, energy frontier DIS collider at CERN. New simulations are shown on the potential of measuring the full set of parton distributions in the proton and of their effect on the Higgs cross section in pp collisions.
Denis Rathjens
(Hamburg University (DE))
30/04/2015, 10:45
WG3 Electroweak Physics and Beyond the Standard Model
Supersymmetry is one of the most thoroughly discussed extensions of the Standard Model, and is providing elegant solutions to fundamental questions like the nature of Dark Matter or the hierarchy problem. In this talk, recent results from the CMS experiment at the LHC on searches for supersymmetry are presented using 20/fb of data from the 8 TeV LHC run. A variety of complementary final state...
Dr
Erez Reinherz-Aronis
30/04/2015, 10:45
WG2 Small-x, Diffraction and Vector Mesons
This talk will present recent results on neutrino interaction cross sections from the T2K experiment.
Matthias Burkardt
(NMSU)
30/04/2015, 10:45
WG6 Spin Physics
Transverse single-spin asymmetries are not the only observable where the transverce force on quarks in DIS plays a role. For example, higher-twist effects in polarized inclusive DIS can be related to that force. Furthermore the torque due to that force is relevant when comparing the Jaffe-Manohar with the Ji definition for quark orbital angular momentum. I explain the origin of that force in...
David Clark
(Southern Methodist University)
30/04/2015, 10:45
Jonathan Asaadi
(Syracuse University),
Jonathan Asaadi
(urn:Google)
30/04/2015, 11:10
WG2 Small-x, Diffraction and Vector Mesons
The analysis and interpretation of the present and future neutrino oscillation experiments
strongly rely on the quantitative understanding of neutrino and antineutrino interactions with nuclei in the "few GeV" energy range. With the advent of the Liquid Argon Time Projec-
tion Chamber (LArTPC) experimental techniques for neutrino detection, a novel approach and
methodology in neutrino data...
nobuo sato
(jlab)
30/04/2015, 11:10
Dr
Yazid Delenda
(Université Hadj Lakhdar - Batna)
30/04/2015, 11:10
WG4 QCD and Hadronic Final States
We calculate non-global logarithms at finite $N_c$ for the hemisphere mass distribution in $e^+e^-\to q \bar{q}$ at single logarithmic accuracy up to fifth order in the coupling constant. Our results indicate the possibility of resummation of these logarithms to all orders into an exponential form. We compare our findings to those reported in the literature at large $N_c$ and find agreement....
Dr
Kalyan Allada
(Massachusetts Institute of Technology)
30/04/2015, 11:10
WG6 Spin Physics
Semi-inclusive deep inelastic scattering (SIDIS) is a powerful tool to explore the 3-d structure of nucleon in momentum space. Through a combination of polarized/unpolarized lepton beam and nucleon target one can study various transverse-momentum dependent parton distribution functions (TMDs) that appear in the SIDIS cross-section. TMDs provide a description of nucleon structure in terms of...
Federico Meloni
(Universitaet Bern (CH))
30/04/2015, 11:13
WG3 Electroweak Physics and Beyond the Standard Model
Despite the absence of experimental evidence, weak scale
supersymmetry remains one of the best motivated and studied Standard
Model extensions. This talk summarises recent ATLAS results for
searches for supersymmetric (SUSY) particles. Weak and strong
production in both R-Parity conserving and R-Parity violating SUSY
scenarios are considered. The searches involved final states...
Anna Stasto
(Penn State)
30/04/2015, 11:20
Dr
Xinchun Tian
(Univ. of South Carolina)
30/04/2015, 11:35
WG2 Small-x, Diffraction and Vector Mesons
New measurements of coherent ρ0 and ρ+ production in NOMAD are reported. We present simulation of neutrino induced coherent ρ-meson production in charged and neutral current interactions. Sensitivity studies of this process for next generation neutrino scattering experiments is presented.
Dr
Kamel Khelifa-Kerfa
(Université Hassiba Benbouali de Chlef)
30/04/2015, 11:35
WG4 QCD and Hadronic Final States
We present a general formalism for computing the matrix-elements squared for the emission of soft energy-ordered gluons to (theoretically) any order in perturbation theory at finite $N_c$. Our formalism is valid in the eikonal approximation. A Mathematica package is being developed for the automated calculation of all real/virtual eikonal squared-amplitudes necessary at a given order. For the...
Kenneth Barish
(UC Riverside)
30/04/2015, 11:35
WG6 Spin Physics
(for the PHENIX Collaboration)
Transverse single-spin asymmetries (TSSA) provide valuable information about
the spin structure of the nucleon. Here, we report results of TSSA in $\eta$ and single-muon production channels in p+p collision. Non-vanishing TSSA in eta meson production channel has been reported for Run-2008 data (Phys. Rev. D 90, 072008), in the forward rapidity region, which...
Tomas Kasemets
(Nikhef/VU)
30/04/2015, 11:35
Florian Lyonnet
(LPSC)
30/04/2015, 11:44
WG3 Electroweak Physics and Beyond the Standard Model
QCD resummation predictions for the production of W′ and Z′ heavy gauge bosons decaying leptonically will be presented. The results of our resummation code at next-to-leading order and next-to-leading logarithmic accuracy will be compared to Monte Carlo predictions obtained with PYTHIA at leading order supplemented with parton showers and FEWZ at NLO and next-to-next-to-leading order for the...
Rolf Ent
(Jefferson Lab)
30/04/2015, 11:45
WG7 Future experiments
Inclusive and semi-inclusive deep inelastic scattering (DIS and SIDIS) are important tools for understanding the structure of nucleons and nuclei. Spin asymmetries in polarized SIDIS are directly related to transverse momentum dependent parton distributions (TMDs) and fragmentation functions. The usual collinear parton distribution functions depend on the fraction of hadron momentum carried by...
Dr
James L. Drachenberg
(Valparaiso University)
30/04/2015, 12:00
WG6 Spin Physics
Current knowledge of nucleon transverse-polarization structure comes from measurements of transverse single-spin asymmetries (SSAs) from semi-inclusive deep inelastic scattering (SIDIS). These measurements, combined with those of $e^{+}e^{-}$ collisions, have allowed the first extraction of transversity with limited constraints at higher values of Bjorken-$x$. One avenue to enrich...
Heather Turmeau Mcaslan
(University of Sussex (GB))
30/04/2015, 12:00
WG4 QCD and Hadronic Final States
Event shape observables are essential tools for studying the behaviour of high energy QCD. Yet in the region where soft and collinear gluon emission is most dominant, standard perturbation theory is rendered unreliable and the series must be resummed to all orders in the strong coupling. We have recently developed a general method for the resummation of event shapes, in e+e- annihilation, at...
Nathaniel Craig
(UC Santa Barbara)
30/04/2015, 12:04
WG3 Electroweak Physics and Beyond the Standard Model
We provide an overview of the state of beyond-the-Standard Model phenomenology at the beginning of Run 2, with a particular focus on phenomena associated with naturalness of the weak scale. We also briefly survey the prospects for probing naturalness at future high-energy colliders.
Ingo Schienbein
(urn:Google),
Ingo Schienbein
(Universite Joseph Fourier),
Simona Malace,
Stefano Camarda
(Deutsches Elektronen-Synchrotron (DE))
01/05/2015, 09:00
Eugenio Scapparone
(INFN-Bologna(IT)),
Robert Ciesielski
(Rockefeller University (US)),
Yuri Kovchegov
(urn:Google),
Yuri Kovchegov
(T),
Yuri Kovchegov
(The Ohio State University),
Zelimir Djurcic
(A)
01/05/2015, 09:30
Peter Onyisi
(University of Texas (US)),
Seamus Riordan
(Stony Brook University),
Simone Marzani
(MIT)
01/05/2015, 10:00
Pavel Starovoitov
(Deutsches Elektronen-Synchrotron (DE)),
Stefan Hoeche
(SLAC),
Sung Won Lee
(Texas Tech University (US))
01/05/2015, 11:00
Achim Geiser
(Deutsches Elektronen-Synchrotron (DE)),
Flera Rizatdinova
(Oklahoma State University (US)),
Marco Guzzi
(Deutsches Elektronen-Synchrotron (DE))
01/05/2015, 11:30
Francesca Giordano
(UIUC),
Francesca Giordano
(UIUC),
Francesca Giordano
(Univ. Illinois at Urbana-Champaign (US)),
Patricia Solvignon
(University of New Hampshire), Dr
Ted Rogers
(Old Dominion University)
01/05/2015, 12:00
Dave Gaskell
(Jefferson Lab),
Roberto Petti
(University of South Carolina (US)),
Uta Klein
(University of Liverpool (GB))
01/05/2015, 13:30
Yuji Yamazaki
(Kobe University (JP))
01/05/2015, 14:00
Max Klein
(University of Liverpool (GB))
01/05/2015, 14:30
Patricia McBride
(Fermi National Accelerator Laboratory (FNAL))
01/05/2015, 15:30
Dr
Zhongbo Kang
(Los Alamos National Laboratory)
WG6 Spin Physics
I will present the recent developments/status of transverse momentum dependent (TMD) evolution and global analysis of TMD extractions, as well as the future perspective. I will compare different approaches and discuss their phenomenological consequences (in a case study of Sivers asymmetry), and point out what's needed in the future global analysis.
Prof.
Simonetta Liuti
(University of Virginia)
WG1 Structure Functions and Parton Densities
I will discuss the application of an alternative type of neural network, the Self-Organizing Maps (SOMs), to extract parton distribution functions from various hard scattering processes. SOMs provide a complementary algorithm to NNPDFs yielding a parametrization that is free from the bias implicit in choosing specific analytic forms. At the same time it enables us to extrapolate to...
Alexei Prokudin
(Jefferson Lab)
WG6 Spin Physics
We attempt an extraction of the pretzelosity distribution ($h^{\perp}_{1T}$) from preliminary COMPASS, HERMES, and JLAB experimental data on
$\sin(3\phi_h - \phi_S)$ asymmetry on proton, and effective deuteron and neutron targets.
The resulting distributions, albeit with big errors, for the first time
show tendency for up-quark pretzelosity to be positive and down-quark pretzelosity to...
Stefania Vecchi
(Sezione di Ferrara (INFN)-Universita di Ferrara)
nobuo sato
(jlab)
WG1 Structure Functions and Parton Densities
In this talk we will discuss the phenomenology of direct photon production
using theoretical predictions at \emph{next-to-leading order} with
threshold resummation up to \emph{next-to-leading-logarithmic}
accuracy. By analyzing the global data sets of direct photons, we
found good agreement between the theory and the data for a wide
range of energies ($\sqrt{s}=23$ GeV up to $7$ TeV) if...
Dr
Zhongbo Kang
(Los Alamos National Laboratory)
WG2 Small-x, Diffraction and Vector Mesons
In this talk, we will demonstrate the conventional small-x/color glass condensate (CGC) formalism contains large logarithms log(pt/M) when the dilepton mass is much smaller than its transverse momentum M << pt. We propose a new factorization formalism within the small-x approach to resum these large logarithms to all orders and make numerical calculations relevant to both RHIC and LHC energies.
Elizaveta Shabalina
(Georg-August-Universitaet Goettingen (DE))
WG1 Structure Functions and Parton Densities
The measurements of the production cross sections of
inclusive, di- and tri-jet events probe the dynamics of QCD and can
constrain the parton proton structure. Double-differential cross
sections are measured and compared to expectations based on
next-to-leading order QCD calculations as well as to next-to-leading
order Monte Carlo simulations. A QCD analysis of the data...
Prof.
Roberto Petti
(Univ. of South Carolina)
WG1 Structure Functions and Parton Densities
We discuss the current status in the calculation of high-energy neutrino and anti-neutrino inelastic scattering off nuclei in terms of nuclear structure functions. We present calculations of differential cross sections for inclusive neutrino and anti-neutrino scattering in comparison with recent data on different target materials. We discuss similarities and dissimilarities in the calculation...
Dr
Wally Melnitchouk
(Jefferson Lab)
WG5 Heavy Flavours
We present a new global QCD analysis of parton distribution functions, allowing for possible intrinsic charm (IC) contributions in the nucleon inspired by light-front models. The analysis makes use of the full range of available high-energy scattering data for $Q^2 > 1$ GeV$^2$ and $W^2 > 3.5$ GeV$^2$, including fixed-target proton and deuteron cross sections at lower energies that were...
Alexei Prokudin
(Jefferson Lab)
WG6 Spin Physics
We investigate the nucleon tensor charge from current experiments
by a combined analysis of the Collins asymmetries in two hadron
production in $e^+e^-$ annihilations and single inclusive hadron
production in deep inelastic scattering
processes. The
transverse momentum dependent
evolution is taken into
account, for the first time, in the global fit of the Collins...
Tomas Jezo
(Milano Bicocca)
WG4 QCD and Hadronic Final States
We discuss the calculation of next-to-leading order QCD corrections to the electroweak top-pair production in the extensions of the Standard Model predicting an additional heavy neutral spin-1 resonance Z'. Compared to previous studies we implement our calculation in the POWHEG BOX V2 framework allowing for consistent matching of NLO QCD computations with the parton shower.
Cristina Lazzeroni
(University of Birmingham (GB))
WG4 QCD and Hadronic Final States
We report the first observation of the very rare decay K+- -> pi+- pi0 e+ e- by the NA48/2 experiment. From a clean sample of almost 2000 reconstructed signal events, we have determined the branching fraction with high precision and measured the e+ e- invariant mass distribution, which allows to differentiate between different decay models.
Besides, the NA48/2 experiment has recently...
Elizaveta Shabalina
(Georg-August-Universitaet Goettingen (DE))
WG4 QCD and Hadronic Final States
Photons and weak bosons do not interact strongly with the
dense and hot medium formed in the nuclei collisions, thus should be
sensitive to the nuclear modification of parton distribution functions
(nPDFs). In particular, proton-lead collisions provide an excellent
opportunity to test nPDFs in a less dense environment than lead-lead.
The ATLAS detector, optimized for searching new physics...
Collaboration H1
(DESY)
WG4 QCD and Hadronic Final States
Signals of QCD instanton-induced processes are searched for in deep-inelastic scatter- ing at the electron-proton collider HERA in the kinematic region defined by the Bjorken- scaling variable x > 10−3, the inelasticity 0.2 < y < 0.7 and the photon virtuality 150 < Q2 < 15000 GeV2. The search is performed using H1 data corresponding to an inte- grated luminosity of 351 pb−1. No evidence for...
Braden Keim Abbott
(University of Oklahoma (US))
WG5 Heavy Flavours
We present a search for the Zb(10610) and the Zb(10650) using the decay Zb → ϒ(nS)π± where ϒ(nS) → μμ in 10.4 fb−1 of ppbar collisions at √s=1.96 TeV collected by the D0 experiment during Run II of the Tevatron collider. Sensitivity to the production of Zb is demonstrated and the results of the search will be presented for the first time.
Mr
Nicolo CMS Collaboration
(Cartiglia)
WG5 Heavy Flavours
Measurements of single top quark production are presented, performed using CMS data collected in 2011 and 2012 at centre-of-mass energies of 7 and 8 TeV. The cross sections for the electroweak production of single top quarks in the t-channel and in association with W-bosons is measured and the results are used to place constraints on the CKM matrix element Vtb. In the t-channel the ratio of...
Tuomas Lappi
(University of Jyvaskyla)
WG2 Small-x, Diffraction and Vector Mesons
We present results from a numerical solution of the next-to-leading order (NLO) Balitsky-Kovchegov (BK) equation in coordinate space in the large Nc limit. We show that the solution is not stable for initial conditions that are close to those used in phenomenological applications of the leading order equation. We identify the problematic terms in the NLO kernel as being related to large...
Dick Greenwood Jr
(Louisiana Tech University (US))
WG5 Heavy Flavours
The ATLAS detector at the LHC is collecting - among others -
a large statistics of Lambda_b decays, allowing the study of
production, decay modes and decay properties of this b-flavored
hadron. This statistics is what allowed one of the most precise
measurements of the Lambda_b lifetime. We will review ATLAS' latest
results on the decay properties of this baryon, including new...
Cynthia Keppel
(Jefferson Lab)
WG1 Structure Functions and Parton Densities
Significant progress has recently been made, both experimentally and theoretically, in extracting the neutron structure function from deuterium data. Of particular note is the Jefferson Lab "BONUS" experiment, where a novel tagged proton spectator approach was employed to isolate the neutron target in electron-deuteron scattering. The BONUS data, combined with a wealth of precision deuterium...
Mr
Nicolo CMS Collaboration
(Cartiglia)
WG5 Heavy Flavours
Measurements of the top quark mass are presented, obtained from CMS data collected in proton proton collisions at the LHC at centre-of-mass energies of 7 TeV and 8 TeV. The mass of the top quark is measured using several methods and channels, including the reconstructed invariant mass distribution of the top quark, an analysis of endpoint spectra as well as measurements from shapes of top...
Dick Greenwood Jr
(Louisiana Tech University (US))
WG5 Heavy Flavours
The top quark pair charge asymmetry is an asymmetry
predicted to occur beyond leading-order QCD in the Standard Model, and
may be significantly enhanced by the presence of new physics. The
ttbar production charge asymmetry is measured inclusively and
differentially using the 7 and 8 TeV ATLAS datasets. Making use of the
large number of top quark pairs collected, we also...
Tomas Kasemets
(DESY)
WG1 Structure Functions and Parton Densities
We discuss transverse momentum dependent (un)polarized gluon distributions (gluon TMDs) and their proper definitions in the context of factorization theorems. All the gluon TMDs have a scale evolution driven by a universal evolution kernel which is resummed to NNLL. By an explicit NLO calculation of the three gluon TMDs which are matched onto leading twist parton distribution functions (PDFs)...
Mr
David Clark
(Southern Methodist University)
WG1 Structure Functions and Parton Densities
High Energy proton-proton collisions at the LHC are capable of producing many electroweak bosons (W/Z) at high rapidity. Measurements of properties of these particles are essential standard candles used to calibrate detectors such as ATLAS and CMS. The collision of heavy nuclei can show significant modifications to the distribution of these bosons. We will present an analysis of electroweak...
Ingo Schienbein
(urn:Google),
Ingo Schienbein
(Universite Joseph Fourier),
Simona Malace,
Stefano Camarda
(Deutsches Elektronen-Synchrotron (DE))
Eugenio Scapparone
(INFN-Bologna(IT)),
Robert Ciesielski
(Rockefeller University (US)),
Yuri Kovchegov
(T),
Yuri Kovchegov
(urn:Google),
Yuri Kovchegov
(The Ohio State University),
Zelimir Djurcic
(A)
Peter Onyisi
(University of Texas (US)),
Seamus Riordan
(Stony Brook University),
Simone Marzani
(MIT)
