Evidence of b-Jet Quenching in PbPb Collisions at √s[subscript NN] = 2.76 TeV
Author(s)
Apyan, Aram; Busza, Wit; Cali, Ivan Amos; Chan, M.; Di Matteo, Leonardo; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Gulhan, Doga Can; Klute, Markus; Lai, Yue Shi; Ma, Teng; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Velicanu, Dragos Alexandru; Veverka, Jan; Wyslouch, Boleslaw; Yoon, A. S.; Zanetti, Marco; Roland, Gunther M; Stoeckli, Fabian; Sumorok, Konstanty C; Yang, Mingming; Wyslouch, Victoria; Barbieri, Richard Alexander; Bauer, Gerry P; Dutta, Valentina; Lee, Yen-Jie; Levin, Andrew Michael; Luckey Jr, P David; Roland, Christof E; ... Show more Show less
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The production of jets associated to bottom quarks is measured for the first time in PbPb collisions at a center-of-mass energy of 2.76 TeV per nucleon pair. Jet spectra are reported in the transverse momentum (p[subscript T]) range of 80–250 GeV/c, and within pseudorapidity |η| < 2. The nuclear modification factor (R[subscript AA]) calculated from these spectra shows a strong suppression in the b-jet yield in PbPb collisions relative to the yield observed in pp collisions at the same energy. The suppression persists to the largest values of p[subscript T] studied, and is centrality dependent. The R[subscript AA] is about 0.4 in the most central events, similar to previous observations for inclusive jets. This implies that jet quenching does not have a strong dependence on parton mass and flavor in the jet p[subscript T] range studied.
Date issued
2014-09Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of ScienceJournal
Physical Review Letters
Publisher
American Physical Society
Citation
Chatrchyan, S., V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, et al. “Evidence of b-Jet Quenching in PbPb Collisions at √s[subscript NN] = 2.76 TeV.” Physical Review Letters 113, no. 13 (September 2014). © 2014 CERN, for the CMS Collaboration
Version: Final published version
ISSN
0031-9007
1079-7114