Dr
Krzysztof Kutak
(Instytut Fizyki Jadrowej Polskiej Akademii Nauk)
02/12/2013, 14:15
MPI & Small-x
Talk
The talk is intended to be an introduction to the low x session. Overview of the problems of low x and MPI
Alexei Myagkov
(Institute for High Energy Physics (RU))
02/12/2013, 14:25
MPI & Small-x
Talk
The high-energy pp collisions at the LHC provide unique opportunity to study particle flow and event shapes of the hadronic final state particles. Evolution of the event shape variables, such as the transverse thrust, thrust minor and transverse sphericity have been studied for minimum bias events. Particle distributions sensitive to the underlying event have been measured using calorimeter...
Ivan Pozdnyakov
(ITEP Institute for Theoretical and Experimental Physics (RU))
02/12/2013, 15:00
MPI & Small-x
Talk
We present recent results sensitive to small-x physics, using data collected by the CMS detector at the LHC. Measurements of the azimuthal decorrelations of Mueller-Navalet dijets at 7 TeV are discussed, and compared to BFKL and DGLAP-based predictions, including the effects of angular ordering and multiparton interactions. Recent studies of low-pT and forward jets at 8TeV, and of the hadronic...
Piotr Kotko
02/12/2013, 15:25
MPI & Small-x
Talk
We present three jet cross sections for proton-proton and proton-lead collisions in a situation where one or all of the jets are in the forward region. The calculation is performed using gauge invariant tree-level off-shell matrix elements and unintegrated gluon density with dynamical nonlinear effects allowing for gluon saturation. Since we deal with asymmetric collisions in the fractions of...
Prof.
Victor Kim
(St. Petersburg Nuclear Physics Institute - PNPI, Gatchina)
02/12/2013, 15:45
MPI & Small-x
Talk
Phenomenological aspects of search for BFKL effects at LHC energies are briefly reviewed. Different observables for forward dijets with large rapidity separation are discussed. In particular, azimuthal angle decorrelations of Mueller-Navelet dijets and ratios for inclusive dijet and Mueller-Navelet dijet cross sections to two-jet cross section are considered.
Mr
Bertrand Ducloue
02/12/2013, 16:30
MPI & Small-x
Talk
The study of the production of two forward jets with a large interval of rapidity at hadron colliders was proposed by Mueller and Navelet as a possible test of the high energy dynamics of QCD. We analyze this process within a complete next-to-leading logarithm framework supplemented by the use of the Brodsky-Lepage-Mackenzie procedure to find the optimal renormalization scale. This leads to a...
Volodymyr Kotlyar
(Nat. Acad. of Sciences of Ukraine (UA))
02/12/2013, 16:50
MPI & Small-x
Talk
Production of real and virtual photons in coincidence with jets, J/psi - mesons and jets, and phi-meson pairs is studied at the LHC energies. Calculations for prompt-photon and lepton-pair production are performed at NLO accuracy with the help of aMC@NLO and MadGraph. Processes of mesons production in proton-proton scattering are simulated using Pythia 8. Computed cross sections are compared...
Dr
Burkhard Schmidt
(CERN)
02/12/2013, 17:10
MPI & Small-x
Talk
With a unique forward acceptance, and excellent vertexing and particle identification capability, LHCb is well-placed to make important contributions to heavy ion physics through measurements performed using data taken during pA and Ap collisions. The first studies of these data, on the production of onia vector mesons will be presented. The results include comparisons of the production...
Albert Knutsson
(University of Antwerp (BE))
02/12/2013, 17:35
MPI & Small-x
Talk
The production yields of leading charged-particle jets and tracks in proton-proton collisions are measured at sqrt(s) = 8 TeV based on a data sample of 17.4 pb−1 collected with the CMS detector. The charged-particle jets (tracks) are measured in the pseudorapidity range |eta| < 2.0 (2.4) for transverse momenta pT > 1 (0.8) GeV. The yield distribution integrated over a given minimum transverse...
Prof.
Gennady Lykasov
(Joint Institute for Nuclear Research , Dubna 141980, Moscow region, Russia)
05/12/2013, 09:00
MPI & Small-x
Talk
We study the unintegrated TMD (transverse momentum dependent) gluon density obtained from the best description of the LHC data on the inclusive spectra of charged hadrons produced in the mid-rapidity region and low transverse momenta at starting scale Q_0^2 = 1 (GeV/c)^2. To extend this unintegrated gluon density (u.g.d) at higher Q^2 we use the Catani-Ciafoloni-Fiorani-Marchesini (CCFM)...
Emmanuel de Oliveira
(IF - USP, Brazil)
05/12/2013, 09:20
MPI & Small-x
Talk
We show that the observation of the Drell-Yan production of low-mass lepton-pairs (M < 20 GeV) at high rapidities (Y > 3) at the LHC can make a direct measurement of parton distribution functions (PDFs) in the low x region, x < 10^{-4}. We describe a procedure that greatly reduces the sensitivity of the predictions to the choice of the factorization scale and, in particular, show how, by...
Emilia Leogrande
(University of Utrecht (NL))
05/12/2013, 09:40
MPI & Small-x
Talk
At LHC energies, several pairs of partons can collide in each pp, pA or AA collision. Multiple Parton Interactions (MPIs) can affect many physical observables, such as the charged particle multiplicity and the average transverse momentum per event. In order to include jets down to the lowest energies ("minijets"), a two-particle correlation analysis is performed with the ALICE Detector. The...
Mark Strikman
(Pennsylvania State University (US))
05/12/2013, 10:05
MPI & Small-x
Talk
I will review the recent theoretical studies of the MPI in collisions with nuclei including effects of leading twist nuclear shadowing as well as the recent tests of the dynamics of leading twist shadowing in coherent and incoherent J/psi photoproduction studied experimentally by ALICE.
Estelle Scifo
(Universite de Paris-Sud 11 (FR))
05/12/2013, 10:25
MPI & Small-x
Talk
A review of fiducial and differential cross section measurements of the recently discovered Higgs boson production in the diphoton channel. These results were obtained with the pp collision dataset corresponding to am integrated luminosity of 20.3 fb-1, for several diphoton and jet distributions.
F Hautmann
(Oxford / Sussex),
H Jung
(Desy / Antwerp)
05/12/2013, 11:15
MPI & Small-x
Talk
In the forthcoming high-luminosity phase at the LHC many of the most interesting QCD measurements so far become prohibitively difficult due to the high pile-up. We suggest a program of QCD measurements based on the observed Higgs boson which can be started now and can be carried through also in the large pile-up environment at high luminosity. It focuses on gluonic processes...
Dr
Igor Cherednikov
(Universiteit Antwerpen)
05/12/2013, 11:35
MPI & Small-x
Talk
We investigate the use of the Wilson lines approach in the analysis of the transverse-momentum broadening probability function, the first moment of which is associated with the jet quenching parameter. Starting from the Euclidean space formulation and then transforming the result to the Minkowski light-cone geometry, we discuss the issues of the UV, rapidity and IR singularities, and possible...
Albert Bursche
(Universitaet Zuerich (CH))
05/12/2013, 11:55
We report measurements of electroweak boson production in the forward region, using data collected at the LHCb experiment with a centre of mass energy of √s=7 TeV with an integrated luminosity of up to 1.0 fb–1. W and Z bosons are reconstructed in leptonic decay channels, and their cross-sections determined using data-driven techniques. The production of gauge bosons in association with jets...
