Measurement of isolated photon production in pp and PbPb collisions at root s(NN)=2.76 TeV
PHYSICS LETTERS B, vol.710, no.2, pp.256-277, 2012 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 710 Issue: 2
- Publication Date: 2012
- Doi Number: 10.1016/j.physletb.2012.02.077
- Journal Name: PHYSICS LETTERS B
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.256-277
- Keywords: CMS, Physics, Heavy-ions, Photons
- Dokuz Eylül University Affiliated: Yes
Abstract
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.