Elsevier

Physics Letters B

Volume 710, Issue 2, 4 April 2012, Pages 256-277
Physics Letters B

Measurement of isolated photon production in pp and PbPb collisions at sNN=2.76 TeV

https://doi.org/10.1016/j.physletb.2012.02.077Get rights and content
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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 |η|<1.44 and transverse energies ET 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 ET-differential yields, scaled by the number of incoherent nucleon–nucleon collisions, is consistent with unity for all PbPb reaction centralities.

Keywords

CMS
Physics
Heavy-ions
Photons

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E-mail address: [email protected].

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1

Also at CERN, European Organization for Nuclear Research, Geneva, Switzerland.