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Relative Modification of Prompt ψ(2S) and J/ψ Yields from pp to PbPb Collisions at sNN=5.02TeV

A. M. Sirunyan et al. (CMS Collaboration)
Phys. Rev. Lett. 118, 162301 – Published 20 April 2017
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Abstract

The relative modification of the prompt ψ(2S) and J/ψ yields from pp to PbPb collisions, at the center-of-mass energy of 5.02 TeV per nucleon pair, is presented. The analysis is based on pp and PbPb data samples collected by the CMS experiment at the LHC in 2015, corresponding to integrated luminosities of 28.0pb1 and 464μb1, respectively. The double ratio of measured yields of prompt charmonia reconstructed through their decays into muon pairs, (Nψ(2S)/NJ/ψ)PbPb/(Nψ(2S)/NJ/ψ)pp, is determined as a function of PbPb collision centrality and charmonium transverse momentum pT, in two kinematic intervals: |y|<1.6 covering 6.5<pT<30GeV/c and 1.6<|y|<2.4 covering 3<pT<30GeV/c. The centrality-integrated double ratios are 0.36±0.08(stat)±0.05(syst) in the first interval and 0.24±0.22(stat)±0.09(syst) in the second. The double ratio is lower than unity in all the measured bins, suggesting that the ψ(2S) yield is more suppressed than the J/ψ yield in the explored phase space.

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  • Received 4 November 2016

DOI:https://doi.org/10.1103/PhysRevLett.118.162301

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2017 CERN, for the CMS

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 118, Iss. 16 — 21 April 2017

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