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Observation of Sequential Υ Suppression in PbPb Collisions

S. Chatrchyan et al. (CMS Collaboration)
Phys. Rev. Lett. 109, 222301 – Published 26 November 2012; Erratum Phys. Rev. Lett. 120, 199903 (2018)
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Abstract

The suppression of the individual Υ(nS) states in PbPb collisions with respect to their yields in pp data has been measured. The PbPb and pp data sets used in the analysis correspond to integrated luminosities of 150μb1 and 230nb1, respectively, collected in 2011 by the CMS experiment at the LHC, at a center-of-mass energy per nucleon pair of 2.76 TeV. The Υ(nS) yields are measured from the dimuon invariant mass spectra. The suppression of the Υ(nS) yields in PbPb relative to the yields in pp, scaled by the number of nucleon-nucleon collisions, RAA, is measured as a function of the collision centrality. Integrated over centrality, the RAA values are 0.56±0.08(stat)±0.07(syst), 0.12±0.04(stat)±0.02(syst), and lower than 0.10 (at 95% confidence level), for the Υ(1S), Υ(2S), and Υ(3S) states, respectively. The results demonstrate the sequential suppression of the Υ(nS) states in PbPb collisions at LHC energies.

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  • Received 13 August 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.222301

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2012 CERN, for the CMS Collaboration

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New Temperature Probe for Quark-Gluon Plasma

Published 26 November 2012

The population of Upsilon mesons in quark-gluon plasma can be used to measure the plasma’s temperature.

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Vol. 109, Iss. 22 — 30 November 2012

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