Measurement of isolated photon production in pp and PbPb collisions at root s(NN)=2.76 TeV

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doi:10.1016/j.physletb.2012.02.077

Isolated photon production is measured in proton-proton and lead-lead collisions at nucleon-nucleon centre-of-mass energies of 2.76 TeV in the pseudorapidity range vertical bar eta vertical bar < 1.44 and transverse energies E-T between 20 and 80 GeV with the CMS detector at the LHC. The measured ET spectra are found to be in good agreement with next-to-leading-order perturbative QCD predictions. The ratio of PbPb to pp isolated photon E-T-differential yields, scaled by the number of incoherent nucleon-nucleon collisions, is consistent with unity for all PbPb reaction centralities. (C) 2012 CERN. Published by Elsevier BM. All rights reserved.

Chatrchyan, S., Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., et al. (2012). Measurement of isolated photon production in pp and PbPb collisions at root s(NN)=2.76 TeV. PHYSICS LETTERS. SECTION B, 710(2), 256-277 [10.1016/j.physletb.2012.02.077].