Centrality, rapidity and transverse momentum dependence of isolated prompt photon production in lead-lead collisions at √s.sub.NN./sub. = 2.76 TeV measured with the ATLAS detector

0470792 - FZÚ 2017 RIV US eng J - Journal Article
Aad, G. - Abbott, B. - Abdallah, J. - Böhm, Jan - Chudoba, Jiří - Havránek, Miroslav - Hejbal, Jiří - Jakoubek, Tomáš - Kepka, Oldřich - Kupčo, Alexander - Kůs, Vlastimil - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek - Vrba, Václav … Total 2882 authors
Centrality, rapidity and transverse momentum dependence of isolated prompt photon production in lead-lead collisions at √s_NN = 2.76 TeV measured with the ATLAS detector.
Physical Review C. Roč. 93, č. 3 (2016), s. 1-28, č. článku 034914. ISSN 2469-9985. E-ISSN 2469-9993
Institutional support: RVO:68378271
Keywords : ATLAS * transverse momentum dependence * quantum chromodynamics * perturbation theory * CERN LHC Coll
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 3.820, year: 2016

Prompt photon production in sNN=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, |η|<1.37 and 1.52≤|η|<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.

Permanent Link: http://hdl.handle.net/11104/0268346