101 research outputs found
Colour coherent phenomena on nuclei and the QCD evolution equation
No full textLeonid Frankfurt, Vadim Guzey and Mark Strikma
Nuclear shadowing in deep inelastic scattering on nuclei: leading twist versus eikonal approaches
No full textLeonid Frankfurt, Vadim Guzey, Martin McDermott and Mark Strikma
Nuclear broadening effects on hard prompt photons at CERN-SPS and BNL-RHIC energies
No full textWe calculate prompt photon production in high-energy nuclear collisions. We focus on the broadening of the intrinsic transverse momenta of the partons in the initial state from nuclear effects, and their influence on the prompt photon pt distribution. Comparing to WA98 data from Pb+Pb collisions at s = 17.4A GeV we find evidence for the presence of nuclear broadening at high pt in this hard process. Below pt < 2.7 GeV the photon distribution is due to small momentum transfer processes. At RHIC energy, s = 200A GeV, the e ect of intrinsic transverse momentum on the spectrum of prompt photons is less prominent. The region pt = 3 4 GeV would be the most promising for studying the nuclear broadening e ects at that energy. Below pt = 2 3 GeV the contribution from large momentum transfers flattens out, and we expect that region to be dominated by soft contributions.Korrigierte Version unter dem Titel: Dumitru, Adrian ; Frankfurt, Leonid ; Gerland, Lars ; Stöcker, Horst ; Strikman, Mark : Nuclear broadening effects on hard prompt photons at relativistic energie
Fluctuations of the nucleon transverse parton densities and inelastic collisions at the LHC
No full textThe third international workshop on multiple partonic interactions (MPI) took place at DESY in Hamburg from 21 to 25 November 2011. MPI are often crucial for interpreting results obtained at the Large Hadron Collider (LHC). The quest for a sound understanding of the dynamics behind MPI { particularly in the era of the LHC { has thus focused the aim of this workshop. It concentrated on phenomenology at previous hadron colliders and early LHC results, as well as theoretical considerations and the modeling of MPI in Monte Carlo event generators. The workshop forstered close contact between the experimental and theoretical communities. It provided a setting to discuss many of the dierent aspects of MPI, eventually identifying them as a unifying concept between apparently dierent lines of research and evaluating their impact on the LHC physics programme. In a total of 45 plenary talks, two round table discussions and a poster session, the workshop covered experimental results, Monte Carlo development and tuning, phenomenology and dedicated measurements of MPI, progress of theoretical understanding as well as the role of MPI in diraction and small-x physics. Connections to closely related research within the elds of heavy ion physics and cosmic rays have also been covered
Quark-gluon densities in the nuclear fragmentation region in heavy ion collisions at LHC
No full text
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