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Suppression of ϒ(1S), ϒ(2S), and ϒ(3S) quarkonium states in PbPb collisions at √ sNN = 2.76 TeV
CMS Collaboration
CMS Collaboration
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Abstract
The production yields of ϒ(1S), ϒ(2S), and ϒ(3S) quarkonium states are measured through their decays
into muon pairs in the CMS detector, in PbPb and pp collisions at the centre-of-mass energy per nucleon
pair of 2.76 TeV. The data correspond to integrated luminosities of 166 μb−1 and 5.4 pb−1 for PbPb and
pp collisions, respectively. Differential production cross sections are reported as functions of ϒ rapidity
y up to 2.4, and transverse momentum pT up to 20 GeV/c. A strong centrality-dependent suppression is
observed in PbPb relative to pp collisions, by factors of up to ≈2 and 8, for the ϒ(1S) and ϒ(2S) states,
respectively. No significant dependence of this suppression is observed as a function of y or pT. The ϒ(3S)
state is not observed in PbPb collisions, which corresponds to a suppression for the centrality-integrated
data by at least a factor of ≈7 at a 95% confidence level. The observed suppression is in agreement with
theoretical scenarios modeling the sequential melting of quarkonium states in a quark gluon plasma.
Description
Date
2017-07
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Publisher
Elsevier
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Keywords
CMS, Physics, Heavy ions, Dimuons, Bottomonia
Citation
CMS Collaboration. "Suppression of ϒ(1S), ϒ(2S), and ϒ(3S) quarkonium states in PbPb collisions at √ sNN = 2.76 TeV”, Physics Letters B. (2017) 770: 357-379. https://doi.org/10.1016/j.physletb.2017.04.031