Compact Muon Solenoid
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| CMS-PAS-HIN-21-007 | ||
| Observation of the $\Upsilon$(3S) meson and sequential suppression of $\Upsilon$ states in PbPb collisions at $\sqrt{\smash[b]{s_{_{\mathrm{NN}}}}}= $ 5.02 TeV | ||
| CMS Collaboration | ||
| April 2022 | ||
| Abstract: The production of $\Upsilon$(2S) and $\Upsilon$(3S) mesons in lead-lead (PbPb) and proton-proton (pp) collisions is studied using the CMS detector at the LHC. Their nuclear modification factors, $R_{\textrm{AA}}$, derived from the ratio of yields measured in PbPb to pp collisions, are reported as functions of transverse momentum and PbPb collision centrality. The $\Upsilon$(3S) meson is observed for the first time in PbPb collisions. The suppression is found to be stronger for $\Upsilon$(3S) mesons compared to $\Upsilon$(2S) mesons, extending the pattern of sequential suppression of bottomonium states in nuclear collisions previously seen for the $\Upsilon$(1S) and $\Upsilon$(2S) states. The results provide new constraints on models describing the dynamics of quarkonium states in heavy ion collisions. | ||
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Links:
CDS record (PDF) ;
Physics Briefing ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, PRL 133 (2024) 022302. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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