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Measurement of jet fragmentation in PbPb and pp 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; wy, Boleslaw; Yoon, A. S.; zan, Marco; Wyslouch, Boleslaw; Zanetti, Marco; Dutta, Valentina; Lee, Yen-Jie; Luckey Jr, P David; Roland, Christof E; Sumorok, Konstanty C; Yang, Mingming; Bauer, Gerry P; Levin, Andrew Michael; Roland, Gunther M; Stoeckli, Fabian; Wyslouch, Victoria; Barbieri, Richard Alexander; ... Show more Show less
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Abstract
The jet fragmentation function of inclusive jets with transverse momentum p[subscript T] above 100GeV/c in PbPb collisions has been measured using reconstructed charged particles with p[subscript T] above 1 GeV/c in a cone of radius 0.3 around the jet axis. A data sample of PbPb collisions collected in 2011 at a nucleon-nucleon center-of-mass energy of √s[subscript NN] = 2.76TeV corresponding to an integrated luminosity of 150 μb[superscript −1] is used. The results for PbPb collisions as a function of collision centrality and jet transverse momentum are compared to reference distributions based on pp data collected at the same center-of-mass energy in 2013, with an integrated luminosity of 5.3 pb[superscript −1]. A centrality-dependent modification of the fragmentation function is found. For the most central collisions, a significant enhancement is observed in the PbPb/pp fragmentation function ratio for charged particles with p[subscript T] less than 3 GeV/c. This enhancement is observed for all jet p[subscript T] bins studied.
Date issued
2014-08
URI
http://hdl.handle.net/1721.1/91220
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of Science
Journal
Physical Review C
Publisher
American Physical Society
Citation
Chatrchyan, S., V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, et al. “Measurement of Jet Fragmentation in PbPb and pp Collisions at √s[subscript NN] = 2.76 TeV.” Phys. Rev. C 90, no. 2 (August 2014). © 2014 CERN, for the CMS Collaboration
Version: Final published version
ISSN
0556-2813
1089-490X

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