Centrality, rapidity, and transverse momentum dependence of isolated prompt photon production in lead-lead collisions at
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Centrality, rapidity, and.pdf
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823.59 KB
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Author(s)
Taylor, Frank E
Date Issued
March 2016
Journal
Physical Review C
Publisher
American Physical Society
Citation
Aad, G. et al. “Centrality, Rapidity, and Transverse Momentum Dependence of Isolated Prompt Photon Production in Lead-Lead Collisions at √SNN = 2.76 TeV Measured with the ATLAS Detector.” Physical Review C 93.3 (2016): n. pag. © 2016 CERN for the ATLAS Collaboration
Version
Final published version
Abstract
Prompt photon production in √sNN = 2.76-TeV Pb + Pb collisions has been measured by the ATLAS experiment at the Large Hadron Collider using data collected in 2011 with an integrated luminosity of 0.14 nb[superscript −1]. Inclusive photon yields, scaled by the mean nuclear thickness function, are presented as a function of collision centrality and transverse momentum in two pseudorapidity intervals, |η| < 1.37 and 1.52 ≤ |η| < 2.37. The scaled yields in the two pseudorapidity intervals, as well as the ratios of the forward yields to those at midrapidity, are compared to the expectations from next-to-leading-order perturbative QCD (pQCD) calculations. The measured cross sections agree well with the predictions for proton-proton collisions within statistical and systematic uncertainties. Both the yields and the ratios are also compared to two other pQCD calculations, one which uses the isospin content appropriate to colliding lead nuclei and another which includes nuclear modifications to the nucleon parton distribution functions.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevC.93.034914
