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Observation and studies of jet quenching in PbPb collisions at √sNN=2.76 TeV

Author(s)
Alver, Burak Han; Bendavid, Joshua L.; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; Chan, M.; Dutta, Valentina; Everaerts, Pieter Bruno Bart; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hahn, Kristian Allan; Kim, Y.; Klute, Markus; Li, W.; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Sung, Kevin Kai Hong; Wenger, Edward Allen; Xie, Si; Yilmaz, Yetkin; Zanetti, Marco; Wyslouch, Boleslaw; Luckey Jr, P David; Roland, Gunther M; Harris, Philip Coleman; Lee, Yen-Jie; Loizides, Constantinos; Roland, Christof E; Rudolph, Matthew Scott; Sumorok, Konstanty C; Yang, Mingming; Yoon, A. S.; Bauer, Gerry P; ... Show more Show less
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Abstract
Jet production in PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV was studied with the Compact Muon Solenoid (CMS) detector at the LHC, using a data sample corresponding to an integrated luminosity of 6.7 μb[superscript −1]. Jets are reconstructed using the energy deposited in the CMS calorimeters and studied as a function of collision centrality. With increasing collision centrality, a striking imbalance in dijet transverse momentum is observed, consistent with jet quenching. The observed effect extends from the lower cutoff used in this study (jet p[subscript T]=120 GeV/c) up to the statistical limit of the available data sample (jet p[subscript T]≈210 GeV/c). Correlations of charged particle tracks with jets indicate that the momentum imbalance is accompanied by a softening of the fragmentation pattern of the second most energetic, away-side jet. The dijet momentum balance is recovered when integrating low transverse momentum particles distributed over a wide angular range relative to the direction of the away-side jet.
Date issued
2011-08
URI
http://hdl.handle.net/1721.1/67342
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review C
Publisher
American Physical Society
Citation
Chatrchyan, S. et al. “Observation and studies of jet quenching in PbPb collisions at sqrt[s_{NN}]=2.76 TeV.” Physical Review C 84 (2011): n. pag. Web. 1 Dec. 2011. © 2011 American Physical Society
Version: Final published version
ISSN
0556-2813

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