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.

Replaced 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)

References in corpus (8)

• An Introduction to PYTHIA 8.2
• Heavy quarkonium: progress, puzzles, and opportunities
• Observation of long-range near-side angular correlations in proton-lead collisions at the LHC
• Static quark-antiquark pairs at finite temperature
• Color Screening and Regeneration of Bottomonia in High-Energy Heavy-Ion Collisions
• Bottomonium suppression using a lattice QCD vetted potential
• Production of inclusive ${\rm Y}$(1S) and ${\rm Y}$(2S) in p-Pb collisions at $\sqrt{{\mathbf{s}}_{\mathrm{NN}}}=5.02$ TeV
• Gluo-dissociation of Heavy Quarkonium in the Quark-Gluon Plasma Revisited

Cited by in corpus (10)

• The Present and Future of QCD
• Measurement of the prompt $D^0$ nuclear modification factor in $p$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV
• Observation of the ${\rm Y}$(3S) meson and suppression of ${\rm Y}$ states in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Recombination of $B_c$ mesons in ultra-relativistic heavy-ion collisions
• Model study on ${\rm Y}(nS)$ modification in small collision systems
• Bottomonium transport in p-Pb and Pb-Pb collisions at the LHC
• Observation of the charged-particle multiplicity dependence of ${\sigma }_{\psi (2S)}/{\sigma }_{\text{J}/\psi }$ in pPb collisions at 8.16 TeV
• Multiplicity dependence of ${\rm Y}$ production at forward rapidity in pp collisions at $\sqrt{s}$ = 13 TeV
• Exploring parameter dependence of heavy-flavor dynamics in small collision systems
• Non-Markovian dynamics of bottomonia in the QGP