Charged-particle nuclear modification factors in XeXe collisions at root S-NN=5.44 TeV

Sirunyan A. M., Tumasyan A., Adam W., Ambrogi F., Asilar E., Bergauer T., ...More

JOURNAL OF HIGH ENERGY PHYSICS, no.10, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: Issue: 10
  • Publication Date: 2018
  • Doi Number: 10.1007/jhep10(2018)138
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: Hadron-Hadron scattering (experiments), Heavy-ion collision, Quark gluon plasma, QUARK-GLUON PLASMA, TRANSVERSE-MOMENTUM, CENTRALITY DEPENDENCE, PB COLLISIONS, HEAVY, SPECTRA, PERSPECTIVE, RAPIDITY, LIGHT, FLOW
  • Middle East Technical University Affiliated: Yes


The differential yields of charged particles having pseudorapidity within vertical bar eta vertical bar < 1 are measured using xenon-xenon (XeXe) collisions at root S-NN = 5.44 TeV. The data, corresponding to an integrated luminosity of 3.42 mu b(-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 root 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-AA*, are constructed and compared to previous measurements and theoretical predictions. In head-on collisions, the R-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 approximate to 6 GeV, the XeXe data show a notably smaller suppression than previous results for lead-lead (PbPb) collisions at root S-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.