Inclusive isolated photons in pp and PbPb collisions at 2.76 TeV with CMS
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Stephans-2013-Inclusive isolated p.pdf
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Author(s)
Stephans, George S. F.
Date Issued
May 2013
Journal
Nuclear Physics A
Publisher
Elsevier
Citation
Stephans, George. “Inclusive Isolated Photons in Pp and PbPb Collisions at 2.76 TeV with CMS.” Nuclear Physics A 904–905 (May 2013): 581c–584c. © CERN for the benefit of the CMS Collaboration
Version
Final published version
Abstract
The CMS detector at the LHC has been used to measure the yield of isolated photons in both proton–proton and lead–lead collisions at a nucleon–nucleon center of mass energy of 2.76 TeV. Photons were detected in the pseudorapidity range |η|<1.44 and with transverse energies E[subscript T] between 20 and 80 GeV. The E[subscript T] spectra found using next-to-leading-order perturbative QCD calculations are in good agreement with the data. The centrality dependence of the ratio of isolated photon yields in PbPb over those in pp is well described by the number of incoherent nucleon–nucleon collisions. Therefore, the yields of isolated photons in PbPb are consistent with there being no modification of their production in the initial state and no absorption of these photons as they traverse the hot and dense medium created in these very high energy heavy ion collisions.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1016/j.nuclphysa.2013.02.081
