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

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., Dragicevic, M., Ero, J., Fabjan, C., Friedl, M., Fruhwirth, R., Ghete, V.m., Hammer, J., Hoch, M., Hormann, N., Hrubec, J., Jeitler, M., Kiesenhofer, W., Knapitsch, A., Krammer, M., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 710:2(2012), pp. 256-277. [10.1016/j.physletb.2012.02.077]