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Centrality, rapidity, and transverse momentum dependence of isolated prompt photon production in lead-lead collisions at root S-NN=2.76 TeV measured with the ATLAS detector
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
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Rekke forfattare: 28822016 (engelsk)Inngår i: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 93, nr 3, artikkel-id 034914Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Prompt photon production in root S-NN = 2.76-TeV Pb + Pb collisions has been measured by the ATLAS experiment at the Large Hadron Collider using data collected in 2011 with an integrated luminosity of 0.14 nb(-1). Inclusive photon yields, scaled by the mean nuclear thickness function, are presented as a function of collision centrality and transverse momentum in two pseudorapidity intervals, vertical bar eta vertical bar < 1.37 and 1.52 <= vertical bar eta vertical bar < 2.37. The scaled yields in the two pseudorapidity intervals, as well as the ratios of the forward yields to those at midrapidity, are compared to the expectations from next-to-leading-order perturbative QCD (pQCD) calculations. The measured cross sections agree well with the predictions for proton-proton collisions within statistical and systematic uncertainties. Both the yields and the ratios are also compared to two other pQCD calculations, one which uses the isospin content appropriate to colliding lead nuclei and another which includes nuclear modifications to the nucleon parton distribution functions.

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American Physical Society , 2016. Vol. 93, nr 3, artikkel-id 034914
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Identifikatorer
URN: urn:nbn:se:kth:diva-185945DOI: 10.1103/PhysRevC.93.034914ISI: 000372800000003Scopus ID: 2-s2.0-84966391989OAI: oai:DiVA.org:kth-185945DiVA, id: diva2:924834
Forskningsfinansiär
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Merknad

QC 20160429

Tilgjengelig fra: 2016-04-29 Laget: 2016-04-29 Sist oppdatert: 2017-11-30bibliografisk kontrollert

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Jovicevic, JelenaKuwertz, EmmaLund-Jensen, BengtMorley, AnthonyStrandberg, Jonas
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