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Suppression of Excited Υ States Relative to the Ground State in Pb-Pb Collisions at √sNN=5.02  TeV

Research output: Contribution to journalArticle

  • CMS Collaboration
Original languageEnglish
Article number142301
Number of pages17
JournalPhysical Review Letters
Issue number14
Early online date2 Apr 2018
DateAccepted/In press - 16 Jan 2018
DateE-pub ahead of print - 2 Apr 2018
DatePublished (current) - 6 Apr 2018


The relative yields of Υ mesons produced in pp and Pb-Pb collisions at √sNN=5.02 TeV and reconstructed via the dimuon decay channel are measured using data collected by the CMS experiment. Double ratios are formed by comparing the yields of the excited states, Υ(2S) and Υ(3S), to the ground state, Υ(1S), in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios, [Υ(nS)/Υ(1S)]Pb−Pb/[Υ(nS)/Υ(1S)]pp, are measured to be 0.308±0.055(stat)±0.019(syst) for the Υ(2S) and less than 0.26 at 95% confidence level for the Υ(3S). No significant
Υ(3S) signal is found in the Pb-Pb data. The double ratios are studied as a function of collision centrality, as well as Υ transverse momentum and rapidity. No significant dependencies are observed.

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