Measurement of nuclear modification factors of ϒ(1S), ϒ(2S), and ϒ(3S) mesons in PbPb collisions at √sNN = 5.02 TeV
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Issue Date
2019-03-10Author
Sirunyan, A.M.
Sanders, Stephen J.
The CMS Collaboration
Publisher
Elsevier
Type
Article
Article Version
Scholarly/refereed, publisher version
Rights
© 2019 The Author(s). Published by Elsevier B.V.
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The cross sections for ϒ(1S), ϒ(2S), and ϒ(3S) production in lead–lead (PbPb) and proton–proton (pp) collisions at √sNN = 5.02 TeV have been measured using the CMS detector at the LHC. The nuclear modification factors, RAA, derived from the PbPb-to-pp ratio of yields for each state, are studied as functions of meson rapidity and transverse momentum, as well as PbPb collision centrality. The yields of all three states are found to be significantly suppressed, and compatible with a sequential ordering of the suppression, RAA(ϒ(1S)) > RAA(ϒ(2S)) > RAA(ϒ(3S)). The suppression of ϒ(1S) is larger than that seen at √sNN = 2.76 TeV, although the two are compatible within uncertainties. The upper limit on the RAA of ϒ(3S) integrated over pT, rapidity and centrality is 0.096 at 95% confidence level, which is the strongest suppression observed for a quarkonium state in heavy ion collisions to date.
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This work is licensed under a Creative Commons Attribution 4.0 International License.
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Citation
A.M. Sirunyan et al., "Measurement of nuclear modification factors of ϒ(1S), ϒ(2S), and ϒ(3S) mesons in PbPb collisions at sNN=5.02 TeV", Physics Letters B, Volume 790, 2019, Pages 270-293, ISSN 0370-2693, https://doi.org/10.1016/j.physletb.2019.01.006.
(http://www.sciencedirect.com/science/article/pii/S037026931930022X)
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