Centrality, rapidity, and transverse momentum dependence of isolated prompt photon production in lead-lead collisions at √<i>S<sub>NN</sub></i>=2.76 TeV measured with the ATLAS detector



Aad, G, Abbott, B, Abdallah, J, Khalek, S Abdel, Abdinov, O, Aben, R, Abi, B, Abolins, M, AbouZeid, OS, Abramowicz, H
et al (show 2872 more authors) (2016) Centrality, rapidity, and transverse momentum dependence of isolated prompt photon production in lead-lead collisions at √<i>S<sub>NN</sub></i>=2.76 TeV measured with the ATLAS detector. PHYSICAL REVIEW C, 93 (3). 034914-.

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Abstract

Prompt photon production in $\sqrt{s_{\mathrm{NN}}} = 2.76$ 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$^{-1}$. 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, $|\eta| < 1.37$ and $1.52 < |\eta| < 2.37$. 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 calculations from JETPHOX. The measured cross sections agree well with the predictions for proton-proton collisions within statistical and systematic uncertainties. Both the yields and ratios are also compared to two other pQCD calculations, one which uses the isospin content appropriate to colliding lead nuclei, and another which includes the EPS09 nuclear modifications to the nucleon parton distribution functions.

Item Type: Article
Additional Information: 28 pages plus author list (45 pages total), 8 figures, 8 tables, Submitted to Phys. Rev. C., all figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2012-02/
Uncontrolled Keywords: hep-ex, hep-ex, nucl-ex
Depositing User: Symplectic Admin
Date Deposited: 20 Mar 2017 11:23
Last Modified: 17 Oct 2023 03:09
DOI: 10.1103/PhysRevC.93.034914
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3006015