Forward rapidity isolated photon production in proton-nucleus collisions

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Ducloué , B , Lappi , T & Mäntysaari , H 2019 , ' Forward rapidity isolated photon production in proton-nucleus collisions ' , Nuclear Physics, Section A , vol. 982 , pp. 267-270 .

Title: Forward rapidity isolated photon production in proton-nucleus collisions
Author: Ducloué, B.; Lappi, T.; Mäntysaari, H.
Contributor organization: Helsinki Institute of Physics
Date: 2019-02
Language: eng
Number of pages: 4
Belongs to series: Nuclear Physics, Section A
ISSN: 0375-9474
Abstract: We calculate isolated photon production at forward rapidities in proton-nucleus collisions in the Color Glass Condensate framework. Our calculation uses dipole cross sections solved from the running coupling Balitsky-Kovchegov equation with an initial condition fit to deep inelastic scattering data and extended to nuclei with an optical Glauber procedure that introduces no additional parameters beyond the basic nuclear geometry. We present predictions for future forward RHIC and LHC measurements. The predictions are also compared to updated results for the nuclear modification factors for pion production, Drell-Yan dileptons and J/psi mesons in the same forward kinematics, consistently calculated in the same theoretical framework. We find that leading order, running coupling high energy evolution in the CGC picture leads to a significant nuclear suppression at forward rapidities. This nuclear suppression is stronger for photons than for pions. We also discuss how this might change with next-to-leading order high energy evolution.
Subject: 114 Physical sciences
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: publishedVersion

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