Nuclear modification of ${\rm Y}$ states in pPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV

Abstract

Production cross sections of ${\rm Y}$(1S), ${\rm Y}$(2S), and ${\rm Y}$(3S) states decaying into ${\mu }^{+}{\mu }^{-}$ in proton-lead (pPb) collisions are reported using data collected by the CMS experiment at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV. A comparison is made with corresponding cross sections obtained with pp data measured at the same collision energy and scaled by the Pb nucleus mass number. The nuclear modification factor for ${\rm Y}$(1S) is found to be $R_{\mathrm{pPb}}({\rm Y}(1S))$ = 0.806 $\pm$ 0.024 (stat) $\pm$ 0.059 (syst). Similar results for the excited states indicate a sequential suppression pattern, such that $R_{\mathrm{pPb}}({\rm Y}(1S))$ $>$ $R_{\mathrm{pPb}}({\rm Y}(2S))$ $>$ $R_{\mathrm{pPb}}({\rm Y}(3S))$. The suppression is much less pronounced in pPb than in PbPb collisions, and independent of transverse momentum $p_{\mathrm{T}}^{{\rm Y}}$ and center-of-mass rapidity $y_{\mathrm{CM}}^{{\rm Y}}$ of the individual ${\rm Y}$ state in the studied range $p_{\mathrm{T}}^{{\rm Y}}$ $<$ 30 GeV$/c$ and $|y_{\mathrm{CM}}^{{\rm Y}}|$ $<$ 1.93. Models that incorporate sequential suppression of bottomonia in pPb collisions are in better agreement with the data than those which only assume initial-state modifications.

arXiv commentReplaced with the published version. Added the journal reference. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-18-005 (CMS Public Pages)

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