Conveners
WG1: Structure Functions: Inclusive DIS and PDF updates
- Pavel Nadolsky (Southern Methodist University)
- Katerina Lipka (Deutsches Elektronen-Synchrotron (DE))
- Cynthia Keppel (Jefferson Lab)
WG1: Structure Functions: Jets and top-quarks in QCD analysis
- Cynthia Keppel (Jefferson Lab)
- Pavel Nadolsky (Southern Methodist University)
- Katerina Lipka (Deutsches Elektronen-Synchrotron (DE))
WG1: Structure Functions: Transverse-momentum PDFs (TMDs)
- Cynthia Keppel (Jefferson Lab)
- Katerina Lipka (Deutsches Elektronen-Synchrotron (DE))
- Pavel Nadolsky (Southern Methodist University)
WG1: Structure Functions: Neutron, Helium and double-parton interactions
- Cynthia Keppel (Jefferson Lab)
- Katerina Lipka (Deutsches Elektronen-Synchrotron (DE))
- Pavel Nadolsky (Southern Methodist University)
Stanislav Shushkevich
(Deutsches Elektronen-Synchrotron (DE))
23/04/2013, 08:30
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
A measurement of the integrated luminosity at the ep collider HERA is presented, exploiting the elastic QED Compton process ep \rightarrow ep. The electron and the photon are detected in the backward calorimeter of the H1 experiment. The integrated luminosity of the data recorded in 2003 to 2007 is determined with a precision of 2.3%. The measurement is found to be compatible with the...
Ian Brock
(Universitaet Bonn (DE))
23/04/2013, 08:55
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
The cross sections for neutral current deep inelastic scattering in
e+p collisions with a longitudinally polarised positron beam have been
measured using the ZEUS detector at HERA. The single-differential
cross-sections dsigma/dQ2, dsigma/dx and dsigma/dy and the
double-differential cross sections in Q2 and x are measured in the
kinematic region Q2 > 185 GeV2 for both positively and...
Sergey Alekhin
(DESY-Zeuthen)
23/04/2013, 09:15
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
We report on an update of the ABM NNLO PDF fit, which includes recent LHC data on the W- and Z-boson production along with their experimental uncertainties. We illustrate the constraints on PDFs coming from those LHC data and we also perform a determination of the strong coupling constant alpha_s. Cross section predictions for important benchmark processes at the LHC will be presented.
Alberto Accardi
(Hampton U. and Jefferson Lab)
23/04/2013, 09:40
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
I present three new sets of next-to-leading order parton distribution functions (PDFs) determined by global fits to a wide variety of data for hard scattering processes. The analysis includes target mass and higher twist corrections needed for the description of deep inelastic scattering data at large x and low Q^2, and nuclear corrections for deuterium targets. The PDF sets correspond to...
Prof.
Pavel Nadolsky
(Southern Methodist University)
23/04/2013, 10:05
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
I discuss recent developments in the CTEQ-TEA global analysis
of parton distribution functions
Prof.
Robert Thorne
(University College London)
23/04/2013, 11:00
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
I discuss the recent developments relating to the MSTW series of PDFs. I discuss the issues associated with heavy flavour and the influence of some recent data sets.
Mr
Nathan Hartland
(University of Edinburgh)
23/04/2013, 11:25
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
An accurate and reliable determination of parton distribution functions is vital to fully exploit the potential of the LHC. However the LHC itself also has the ability to provide substantial constraints upon existing PDF determinations. We shall discuss the tools available to study the impact of LHC measurements upon PDFs and discuss the NNPDF2.3 PDF set, which includes constraints from LHC...
Ringaile Placakyte
(Deutsches Elektronen-Synchrotron (DE))
23/04/2013, 11:50
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
The proton parton distribution functions (PDFs)
are essential for precision physics at the LHC
and other hadron colliders. Their current level
of accuracy dominates the theory uncertainties
in Higgs production and it affects substantially
theory predictions for Beyond Standard Model
high mass production.
The determination of the PDFs is a complex
endeavor involving several physics...
Pavel Starovoitov
(Deutsches Elektronen-Synchrotron (DE))
23/04/2013, 12:05
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
Inclusive jet and dijet double-differential cross sections have been measured in proton-proton
collisions at a centre-of-mass energy of 2.76 and 7 TeV using the ATLAS detector. The cross sections were measured using jets clustered with the anti-kT algorithm. The data are compared to expectations based on next-to-leading order QCD calculations corrected for non-perturbative effects, as well...
Benjamin Watt
(UCL)
23/04/2013, 14:00
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
The effect of recent ATLAS inclusive- and di-jet results on the current standard PDF sets is investigated, and compared and contrasted to similar results from the Tevatron. We study the effect of the data using the parton reweighting technique. For ATLAS inclusive jets, there is good agreement across all values of x, and no significant pull is seen on the gluon. For dijets, both D0 and ATLAS...
Ms
Claudia Bertella
(Centre National de la Recherche Scientifique (FR))
23/04/2013, 14:24
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
Measurements of the top quark production cross sections in proton-proton collisions with the ATLAS detector at the Large
Hadron Collider are presented. The measurement require no, one or two electrons or muons in the final state (single
lepton, dilepton, hadronic channel).
In addition, the decay modes with tau leptons are tested (channels with tau leptons). The main focus are measurements...
Jan Kieseler
(Deutsches Elektronen-Synchrotron (DE))
23/04/2013, 14:48
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
Measurements of inclusive and differential top quark pair production cross section at 8 TeV are presented, performed using CMS data collected in 2012. The total cross section is measured in the lepton+jets and dilepton channels, including the tau-dilepton mode. DIfferential cross sections are measured as a function of various kinematic observables, including the transverse momentum and...
Dr
Marco Guzzi
(Desy Hamburg)
23/04/2013, 15:12
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
The rate of the ttbar production at the LHC is large enough to make
thorough measurements of the differential cross section in terms
of the relevant kinematic final-state variables, i.e. transverse momentum $P_T$, rapidity $y$, invariant mass, etc..
The theoretical analysis of such differential distributions requires
knowledge of QCD corrections beyond the NLO as well as higher-order...
Juan Rojo Chacon
(CERN)
23/04/2013, 15:36
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
We derive NNLO+NNLL theoretical predictions for top quark pair production based on all the available NNLO PDF sets, and compare them with the most precise LHC and Tevatron data. In this comparison we study in detail the PDF uncertainty and the scale, $m_t$ and $\alpha_s$ dependence of the theoretical predictions for each PDF set. Next, we exploit the observation that top quark pair production...
Dr
Martin Hentschinski
(Brookhaven National Laboratory)
24/04/2013, 11:00
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
We discuss recent work on the transverse momentum dependent sea quark density at small x and its application to Drell-Yan production at both forward and central rapidities.
Martin Hentschinski
(Brookhaven National Laboratory)
24/04/2013, 11:22
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
Physical anomalous dimensions allow to describe the Q2 dependence of proton structure functions in a factorization scheme independent manner. We perform the first numerical implementation of these physical evolution kernels at both leading and next-to-leading order. A comparison to conventional DGLAP evolution based on factorization into coefficient and parton distribution functions is provided.
Hannes Jung
(Deutsches Elektronen-Synchrotron (DE))
24/04/2013, 11:44
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
We present a determination of the transverse momentum dependent
(TMD) parton densities from HERA measurements.
The gluon and sea quark TMDs are obtained in the one-loop
approximation. The gluon density is also obtained in the all-loop,
small x improved, mode.
The determination of TMDs include also estimates on uncertainties.
Henri Paul Kowalski
(Deutsches Elektronen Synchrotron (DESY))
24/04/2013, 12:06
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
We analyze, in leading and next to leading order of the BFKL equation,
the effects of the quantization of the singularities of the $j$-plane, t-channel partial waves due to the imposition of appropriate infrared and ultraviolet boundary conditions. We show that the intercepts, $\omega_n$ of the Regge poles, which contribute significantly to the gluon density in the kinematic region measured...
Cynthia Keppel
(Jefferson Lab)
24/04/2013, 14:00
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
While an impressive amount of high quality nucleon structure function data exists from hydrogen, deuterium, and other targets, the lack of a neutron target has made direct comparisons between proton and neutron structure nearly impossible at large x where nuclear e๏ฌects become large. The behavior of the d quark as x approaches 1 is particularly sensitive to deuterium nuclear corrections. The...
Harold E Jackson Jr
(Argonne National Laboratory)
24/04/2013, 14:25
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
In 2008 HERMES published the results of an ``isoscalar'' extraction
in leading logarithmic order (LO) in the strong coupling constant of
quantum chromodynamics of the momentum and helicity density distributions of the strange sea in the nucleon from the charged-kaon production in deep-inelastic scattering (DIS) on the deuteron (Phys. Lett. B666, 446 (2008). The shape of the momentum...
Eric Voutier
(LPSC/IN2P3/CNRS - UJF - INP)
24/04/2013, 14:45
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
The partonic structure of hadrons as encoded via the so-called generalized parton distributions (GPD) can be accessed via deeply virtual Compton scattering (DVCS) experiments. Similarly to the scattering of light by a material, DVCS provides information about the dynamics and the spatial structure of hadrons. DVCS off nuclear targets allow to address the partonic structure of the nucleus...
Dr
Eliezer Piasetzky
(Tel Aviv University)
24/04/2013, 15:10
Structure functions and Parton Densities
Talk in Parallel Session at DIS2013
The deep inelastic scattering cross section for scattering from bound nucleons differs
from that of free nucleons. This phenomenon, first discovered 30 years ago, is known as the EMC effect and is still not fully understood. Recent analysis of world data showed that the strength of the EMC effect is linearly correlated with the relative amount of Two-Nucleon Short Range Correlated pairs...
