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

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 and transverse energies between 20 and 80 GeV with the CMS detector at the LHC. The measured spectra are found to be in good agreement with next-to-leading-order perturbative QCD predictions. The ratio of PbPb to pp isolated photon -differential yields, scaled by the number of incoherent nucleon?nucleon collisions, is consistent with unity for all PbPb reaction centralities.

Authorship: Chatrchyan S., Khachatryan V., Sirunyan A.M., Tumasyan A., Adam W., Bergauer T., Dragicevic M., Erö J., Fabjan C., Friedl M., Frühwirth R., Ghete V.M., Hammer J., Hoch M., Hörmann N., Hrubec J., Jeitler M., Kiesenhofer W., Knapitsch A., Krammer M., Liko D., Mikulec I., Pernicka M., Rahbaran B., Rohringer C., Rohringer H., Schöfbeck R., Strauss J., Taurok A., Teischinger F., Wagner P., Waltenberger W., Walzel G., Widl E., Wulz C.

Fuente: Physics Letters, Section B, 2012, 710(2), 256-277

Publisher: Elsevier

Publication date: 01/04/2012

No. of pages: 22

Publication type: Article

DOI: 10.1016/j.physletb.2012.02.077

ISSN: 0370-2693,1873-2445

Publication Url: https://doi.org/10.1016/j.physletb.2012.02.077

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