2009/07/31 by J. Jia, Jiangyong Jia · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1016/j.physletb.2009.10.044
published as Phys.Lett.B681:320-325,2009 · 6 pages, 6 figures, minor change of the figures
arxiv created 2009/08/03 · openalex publication_date 2009/10/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The influence of the underlying nucleon-nucleon collision geometry on evaluations of the nuclear overlap function (TAB) and number of binary collisions (Ncoll) is studied. A narrowing of the spatial distribution of the hard-partons with large light-cone fraction x in nucleons leads to a downward correction for Ncoll and TAB, which in turn, results in an upward correction for the nuclear modification factor RAB. The size of this correction is estimated for several experimentally motivated nucleon-nucleon overlap functions for hard-partons. It is found to be significant in peripheral nucleus-nucleus and nucleon-nucleus collisions, and are much larger at the LHC energy of √(s)=5.5 TeV than for the RHIC energy of √(s)=200 GeV. The implications for experimental measurements are also discussed.