Charged-Particle Nuclear Modification Factors in PbPb and pPb Collisions at √sNN = 5.02 TeV
Name
JHEP04(2017)039.pdf
Size
813.7 KB
Format
Adobe PDF
Checksum (MD5)
52311916e07607baee648fecbe094920
Author(s)
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Apyan, Aram
Azzolini, Virginia
Barbieri, Richard Alexander
Baty, Austin Alan
Bi, Ran
Bierwagen, Katharina
Brandt, Stephanie Akemi
Busza, Wit
Date Issued
April 2017
Journal
Journal of High Energy Physics
Publisher
Springer Nature
Citation
Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, E. Asilar, T. Bergauer, et al. “Charged-Particle Nuclear Modification Factors in PbPb and pPb Collisions at √sNN = 5.02 TeV.” Journal of High Energy Physics 2017, no. 4 (April 2017). © 2017 The Authors
Version
Final published version
Abstract
The spectra of charged particles produced within the pseudorapidity window |η| < 1 at √sNN=5.02 TeV are measured using 404 μb[superscript −1] of PbPb and 27.4 pb[superscript −1] of pp data collected by the CMS detector at the LHC in 2015. The spectra are presented over the transverse momentum ranges spanning 0.5 < p[subscript T] < 400 GeV in pp and 0.7 < p T < 400 GeV in PbPb collisions. The corresponding nuclear modification factor, R AA , is measured in bins of collision centrality. The R AA in the 5% most central collisions shows a maximal suppression by a factor of 7-8 in the p T region of 6-9 GeV. This dip is followed by an increase, which continues up to the highest p T measured, and approaches unity in the vicinity of p[subscript T] = 200 GeV. The R[subscript AA] is compared to theoretical predictions and earlier experimental results at lower collision energies. The newly measured pp spectrum is combined with the pPb spectrum previously published by the CMS collaboration to construct the pPb nuclear modification factor, R[subscript pA], up to 120 GeV. For p T > 20 GeV, R][subscript pA] exhibits weak momentum dependence and shows a moderate enhancement above unity.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 4.0 International License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/JHEP04(2017)039
