Measurement of jet fragmentation in PbPb and pp collisions at √s[subscript NN] = 2.76 TeV
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Chatrchyan-2014-Measurement of jet fragmentation.pdf
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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
Date Issued
August 2014
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
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Final published version
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevC.90.024908
