Observation of the ${\rm Y}$(3S) meson and suppression of ${\rm Y}$ states in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

Abstract

The production of ${\rm Y}$(2S) and ${\rm Y}$(3S) mesons in lead-lead (PbPb) and proton-proton (pp) collisions is studied in their dimuon decay channel using the CMS detector at the LHC. The ${\rm Y}$(3S) meson is observed for the first time in PbPb collisions, with a significance above five standard deviations. The ratios of yields measured in PbPb and pp collisions are reported for both the ${\rm Y}$(2S) and ${\rm Y}$(3S) mesons, as functions of transverse momentum and PbPb collision centrality. These ratios, when appropriately scaled, are significantly less than unity, indicating a suppression of ${\rm Y}$ yields in PbPb collisions. This suppression increases from peripheral to central PbPb collisions. Furthermore, the suppression is stronger for ${\rm Y}$(3S) mesons compared to ${\rm Y}$(2S) mesons, extending the pattern of sequential suppression of quarkonium states in nuclear collisions previously seen for the $\psi$/J, $\psi$(2S), ${\rm Y}$(1S), and ${\rm Y}$(2S) mesons.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplementary figures and tables, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-21-007 (CMS Public Pages)

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• Multiplicity dependence of ${\rm Y}$ production at forward rapidity in pp collisions at $\sqrt{s}$ = 13 TeV
• In-medium Y(1S,2S,3S) suppression in Pb-Pb collisions at sqrt(s_NN)=5.02 TeV
• Non-Markovian dynamics of bottomonia in the QGP