Charged-Particle Nuclear Modification Factors in XeXe Collisions at √s[subscript NN] = 5.44 TeV
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Sirunyan2018_Article_Charged-particleNuclearModific.pdf
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Author(s)
CMS Collaboration
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Azzolini, Virginia
Baty, Austin Alan
Bauer, Gerry P
Bi, Ran
Brandt, Stephanie Akemi
Busza, Wit
Cali, Ivan Amos
Date Issued
October 2018
Journal
Journal of High Energy Physics
Publisher
Springer Nature
Citation
Sirunyan, A. M. et al. “Charged-Particle Nuclear Modification Factors in XeXe Collisions at √s[subscript NN] = 5.44 TeV.” Journal of High Energy Physics 2018, 10 (October 2018): 138 © 2018 The Author(s)
Version
Final published version
Abstract
The differential yields of charged particles having pseudorapidity within |η| < 1 are measured using xenon-xenon (XeXe) collisions at √s[subscript NN] = 5.44 TeV. The data, corresponding to an integrated luminosity of 3.42 μb⁻¹, were collected in 2017 by the CMS experiment at the LHC. The yields are reported as functions of collision centrality and transverse momentum, pT, from 0.5 to 100 GeV. A previously reported pT spectrum from proton-proton collisions at s√=5.02 TeV is used for comparison after correcting for the difference in center-of-mass energy. The nuclear modification factors using this reference, R[subscript AA]* , are constructed and compared to previous measurements and theoretical predictions. In head-on collisions, the R[ subscript AA]* has a value of 0.17 in the pT range of 6–8 GeV, but increases to approximately 0.7 at 100 GeV. Above ≈6 GeV, the XeXe data show a notably smaller suppression than previous results for lead-lead (PbPb) collisions at √s[subscript NN] = 5.02 TeV when compared at the same centrality (i.e., the same fraction of total cross section). However, the XeXe suppression is slightly greater than that for PbPb in events having a similar number of participating nucleons. Keywords: Hadron-Hadron scattering (experiments); Heavy-ion collision; Quark gluon plasma
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1007/JHEP10(2018)138
