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


Chatrchyan S., Khachatryan V., Sirunyan A. M. , Tumasyan A., Adam W., Bergauer T., ...Daha Fazla

PHYSICS LETTERS B, cilt.710, ss.256-277, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 710 Konu: 2
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1016/j.physletb.2012.02.077
  • Dergi Adı: PHYSICS LETTERS B
  • Sayfa Sayıları: ss.256-277

Özet

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.