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Study of jet quenching with isolated-photon+jet correlations in PbPb and pp collisions at √s[NN] = 5.02 TeV

Author(s)
Abercrombie, Daniel Robert; Allen, Brandon Leigh; Azzolini, Virginia; Barbieri, Richard Alexander; Baty, Austin Alan; Bi, Ran; Brandt, Stephanie Akemi; Busza, Wit; Cali, Ivan Amos; D'Alfonso, Mariarosaria; Demiragli, Zeynep; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hsu, Dylan George; Hu, Miao; Iiyama, Yutaro; Innocenti, Gian Michele; Klute, Markus; Kovalskyi, Dmytro; Lai, Yue Shi; Lee, Yen-Jie; Levin, Andrew Michael; Luckey Jr, P David; Maier, Benedikt; Marini, Andrea Carlo; McGinn, Christopher Francis; Mironov, Camelia Maria; Narayanan, Siddharth Madhavan; Niu, Xinmei; Paus, Christoph M. E.; Roland, Christof E; Roland, Gunther M; Salfeld-Nebgen, Jakob Maxillian Henry; Tatar, Kaya; Velicanu, Dragos Alexandru; Wang, J.; Wang, Ta-Wei; Wyslouch, Boleslaw; ... Show more Show less
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Abstract
Measurements of azimuthal angle and transverse momentum (p[subscript T]) correlations of isolated photons and associated jets are reported for pp and PbPb collisions at √s[subscript NN] = 5.02 TeV. The data were recorded with the CMS detector at the CERN LHC. For events containing a leading isolated photon with p[subscript T][superscript γ] > 40 GeV/c and an associated jet with p[subscript T][superscript jet]>30 GeV/c, the photon+jet azimuthal correlation and p[subscript T] imbalance in PbPb collisions are studied as functions of collision centrality and p[subscript T][superscript γ]. The results are compared to pp reference data collected at the same collision energy and to predictions from several theoretical models for parton energy loss. No evidence of broadening of the photon+jet azimuthal correlations is observed, while the ratio p[subscript T][superscript jet]/p[subscript T][superscript γ] decreases significantly for PbPb data relative to the pp reference. All models considered agree within uncertainties with the data. The number of associated jets per photon with p[subscript T][superscript γ] > 80 GeV/c is observed to be shifted towards lower p[subscript T][superscript jet] values in central PbPb collisions compared to pp collisions. Keywords: CMS, Heavy ion, Physics, Photon, Jet, Jet quenching
Date issued
2018-08
URI
http://hdl.handle.net/1721.1/118906
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physics Letters B
Publisher
Elsevier
Citation
Sirunyan, A. M., et al. “Study of Jet Quenching with Isolated-Photon+jet Correlations in PbPb and Pp Collisions at √s[subscript NN] = 5.02 TeV.” Physics Letters B, vol. 785, Oct. 2018, pp. 14–39. © 2018 The Authors
Version: Final published version
ISSN
0370-2693

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