Centrality dependence of inclusive prompt photon production in d+Au, Au+Au, p+Pb, and Pb+Pb collisions

Abstract

We calculate the centrality dependence of the midrapidity nuclear modification for inclusive prompt photon production in d+Au and Au+Au collisions at RHIC and in p+Pb and Pb+Pb collisions at the LHC. Our results, using the recent spatially dependent nuclear PDF set EPS09s, are consistent with the existing high-pT data from the PHENIX and CMS collaborations. The good agreement even in the case of nucleus+nucleus collisions suggests that the high-pT direct photon production is not significantly altered by the strongly interacting medium produced in such collisions. We find the centrality dependence of the nuclear modifications generally rather weak but perhaps measurable at low pT.

14 pages, 7 figures; v2: Corrected a small inaccuracy related to the scale choice mu=pT/2 in figures 1, 2, and 3

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Cited by in corpus (16)

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• A perturbative QCD study of dijets in p+Pb collisions at the LHC
• Neutron skin and centrality classification in high-energy heavy-ion collisions at the LHC
• How robust is a thermal photon interpretation of the ALICE low-p_T data?
• Neutron-skin effect in direct-photon and charged hadron-production in Pb+Pb collisions at the LHC
• Shadowing in inelastic nucleon-nucleon cross section?
• Study of isolated prompt photon production in $p$-Pb collisions for the ALICE kinematics
• The color dipole picture for prompt photon production in $pp$ and $pPb$ collisions at the CERN-LHC
• Triangular flow of thermal photons from an event-by-event hydrodynamic model for 2.76A TeV Pb+Pb collisions at LHC
• Probing nuclear modifications of parton distribution functions through the isolated prompt photon production at the LHC
• Predictions for the isolated prompt photon production at the LHC at $\sqrt{s}=$13 TeV
• Constraining nPDFs with inclusive pions and direct photons at forward rapidities in p+Pb collisions at the LHC
• Centrality and rapidity dependence of inclusive pion and prompt photon production in p+Pb collisions at the LHC with EPS09s nPDFs