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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/53167
Title: Studies of jet quenching using isolated-photon+jet correlations in PbPb and pp collisions at √sNN = 2.76 TeV
Authors: Brochero Cifuentes, J. A.; Cabrillo, I. J.; Calderón-Urrea, Alejandro; Chuang, S. H.; Duarte Campderros, J.; Felcini, M.; Fernández, M.; Gómez, G.; González Sánchez, J.; Jorda, C.; Lobelle Pardo, P.; López Virto, A.; Marco, Jesús; Marco, Rafael; Martínez-Rivero, Celso; Matorras, Francisco; Muñoz Sánchez, F. J.; Rodrigo, Teresa; Rodriguez Marrero, Ana Y.; Ruiz Jimeno, Alberto; Scodellaro, Luca; Sobron Sañudo, M.; Vila, Iván; Vilar, Rocío; Chatrchyan, S.; CMS Collaboration
Issue Date: May-2012
Publisher: Elsevier
Citation: Physics Letters B 718(3): 773-794 (2012)
Abstract: Results from the first study of isolated-photon+jet correlations in relativistic heavy ion collisions are reported. The analysis uses data from PbPb collisions at a centre-of-mass energy of 2.76 TeV per nucleon pair corresponding to an integrated luminosity of 150 inverse microbarns recorded by the CMS experiment at the LHC. For events containing an isolated photon with transverse momentum pt(gamma) > 60 GeV and an associated jet with pt(Jet) > 30 GeV, the photon+jet pt imbalance is studied as a function of collision centrality and compared to pp data and PYTHIA calculations at the same collision energy. Using the pt(gamma) of the isolated photon as an estimate of the momentum of the associated parton at production, this measurement allows an unbiased characterisation of the in-medium parton energy loss. For more central PbPb collisions, a significant decrease in the ratio pt(Jet)/pt(gamma) relative to that in the PYTHIA reference is observed. Furthermore, significantly more pt(gamma) > 60 GeV photons in PbPb are observed not to have an associated pt(Jet) > 30 GeV jet, compared to the reference. However, no significant broadening of the photon+jet azimuthal correlation is observed.
Description: This article is published Open Access at sciencedirect.com. It is distributed under the terms of the Creative Commons Attribution License 3.0.-- CMS Collaboration: et al.
Publisher version (URL): http://dx.doi.org/10.1016/j.physletb.2012.11.003
URI: http://hdl.handle.net/10261/53167
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2012.11.003
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