Production of ${\rm Y}(\text{nS})$ mesons in Pb+Pb and $pp$ collisions at 5.02 TeV

Abstract

A measurement of the production of vector bottomonium states, ${\rm Y}(\text{1S})$, ${\rm Y}(\text{2S})$, and ${\rm Y}(\text{3S})$, in Pb+Pb and $pp$ collisions at a center-of-mass energy per nucleon pair of 5.02 TeV is presented. The data correspond to integrated luminosities of 1.38~${\text{nb}}^{-1}$ of Pb+Pb data collected in 2018, 0.44 ${\text{nb}}^{-1}$ of Pb+Pb data collected in 2015, and 0.26 ${\text{fb}}^{-1}$ of $pp$ data collected in 2017 by the ATLAS detector at the Large Hadron Collider. The measurements are performed in the dimuon decay channel for transverse momentum $p_{\text{T}}^{\mu \mu }<30$~ GeV, absolute rapidity $|y^{\mu \mu }|<1.5$, and Pb+Pb event centrality 0-80%. The production rates of the three bottomonium states in Pb+Pb collisions are compared with those in $pp$ collisions to extract the nuclear modification factors as functions of event centrality, $p_{\text{T}}^{\mu \mu }$, and $|y^{\mu \mu }|$. In addition, the suppression of the excited states relative to the ground state is studied. The results are compared with theoretical model calculations.

arXiv comment39 pages in total, Author lis starting in page 22, 7 figures, 1 table, published in Phys. Rev. C. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2021-12/

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• Regeneration of bottomonia in an open quantum systems approach
• Observation of the ${\rm Y}$(3S) meson and suppression of ${\rm Y}$ states in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Bottomonium suppression at RHIC and LHC in an open quantum system approach
• Transverse momentum dependent feed-down fractions for bottomonium production
• In-medium mass shift of two-flavored heavy mesons, $B_c$, $B_c^{\ast }$, $B_s$, $B_s^{\ast }$, $D_s$ and $D_s^{\ast }$
• Multiplicity dependence of ${\rm Y}$ production at forward rapidity in pp collisions at $\sqrt{s}$ = 13 TeV
• Non-Markovian dynamics of bottomonia in the QGP
• In-medium Y(1S,2S,3S) suppression in Pb-Pb collisions at sqrt(s_NN)=5.02 TeV