Measurement of prompt and nonprompt charmonium suppression in PbPb collisions at 5.02 TeV
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Author(s)
Sirunyan, A. M
Tumasyan, A.
Adam, W.
Ambrogi, F.
Asilar, E.
Bergauer, T.
Brandstetter, J.
Brondolin, E.
Dragicevic, M.
Erö, J.
Date Issued
June 2018
Journal
European Physical Journal C: Particles and Fields
Publisher
Springer Berlin Heidelberg
Citation
Sirunyan, A. M. et al. "Measurement of prompt and nonprompt charmonium suppression in PbPb collisions at 5.02 TeV." European Physical Journal C: Particles and Fields, 78 (June 2018): 509 © 2018 CERN for the benefit of the CMS collaboration
Version
Final published version
Abstract
The nuclear modification factors of J/ψ and ψ (2S) mesons are measured in PbPb collisions at a centre-of-mass energy per nucleon pair of √s[subscript NN] = 5.02 TeV. The analysis is based on PbPb
and pp data samples collected by CMS at the LHC in 2015, corresponding to integrated luminosities of 464 μb⁻¹ and 28 pb⁻¹, respectively. The measurements are performed in the dimuon rapidity range of |y| < 2.4
as a function of centrality, rapidity, and transverse momentum (p[subscript T]) from p[subscript T] = 3 GeV/c in the most forward region and up to 50 GeV/c. Both prompt and nonprompt (coming from b hadron decays)
J/ψ mesons are observed to be increasingly suppressed with centrality, with a magnitude similar to the one observed at √s[subscript NN] = 2.76 TeV
for the two J/ψ meson components. No dependence on rapidity is observed for either prompt or nonprompt J/ψ mesons. An indication of a lower prompt
J/ψ meson suppression at p[subscript T] > 25 GeV/c is seen with respect to that observed at intermediate p[subscript T]. The prompt ψ(2S) meson yield is found to be more suppressed than that of the prompt. J/ψ mesons in the entire p[subscript T] range.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-018-5950-6
