Suppression of non-prompt J/ψ, prompt J/ψ, and Y(1S) in PbPb collisions at √s NN = 2.76 TeV

Chatrchyan, S ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1007/JHEP05(2012)063
  3. Publisher: 2012
  4. Abstract:
  5. Yields of prompt and non-prompt J/ψ, as well as Y(1S) mesons, are measured by the CMS experiment via their μ +μ - decays in PbPb and pp collisions at √/s NN = 2.76 TeV for quarkonium rapidity |y| < 2.4. Differential cross sections and nuclear modification factors are reported as functions of y and transverse momentum pT, as well as collision centrality. For prompt J/ψ with relatively high pT (6.5 < pT < 30 GeV/c), a strong, centrality-dependent suppression is observed in PbPb collisions, compared to the yield in pp collisions scaled by the number of inelastic nucleon-nucleon collisions. In the same kinematic range, a suppression of non-prompt J/ψ, which is sensitive to the in-medium b-quark energy loss, is measured for the first time. Also the low-pT Y(1S) mesons are suppressed in PbPb collisions
  6. Keywords:
  7. Heavy ions
  8. Source: Journal of High Energy Physics ; Volume 2012, Issue 5 , 2012 ; 11266708 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2FJHEP05(2012)063