Suppression of ϒ(1S), ϒ(2S), and ϒ(3S) quarkonium states in PbPb collisions at sNN=2.76TeV

The CMS collaboration

研究成果: Article査読

68 被引用数 (Scopus)

抄録

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 166μb−1 and 5.4pb−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 20GeV/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.

本文言語English
ページ(範囲)357-379
ページ数23
ジャーナルPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
770
DOI
出版ステータスPublished - 2017 7 10

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

フィンガープリント 「Suppression of ϒ(1S), ϒ(2S), and ϒ(3S) quarkonium states in PbPb collisions at s<sub>NN</sub>=2.76TeV」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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