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 \title{Measurement of quarknonium production and polarization in Ru+Ru and Zr+Zr collisions at $\sqrt{s_\mathrm{NN}}$ = 200 GeV with the STAR experiment} 
 \author{Te-Chuan Huang (UIC), Dandan Shen (SDU) and Yan Wang (USTC)\\ (for the STAR Collaboration) }
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Quarkonia are important probes to the properties of the quark-gluon plasma (QGP) created in heavy-ion collisions. Production of quarkonia involves several effects, including dissociation and regeneration in the QGP and cold nuclear matter effects. To disentangle these effects and infer QGP properties, it is desirable to carry out differential measurements for different quarkonium states with high precision. The large-statistics sample from isobaric collisions ($^{96}_{44}Ru$ + $^{96}_{44}Ru$ and $^{96}_{40}Zr$ + $^{96}_{40}Zr$)  at $\sqrt{s_\mathrm{NN}}$ = 200 GeV, collected by the STAR experiment in 2018, provides us a unique opportunity to study quarkonia production in the QGP.

In this contribution, the first measurement of $\psi(2\rm{S})$ production in heavy-ion collisions at RHIC will be presented. $\psi(2\rm{S})$ is reconstructed via the $e^{+}e^{-}$ decay channel with machine learning techniques to enhance the signal significance. Centrality and transverse momentum dependence of the ratio of $\psi(2\rm{S})$ yield over that of J/$\psi$ will be shown. These results together with measurements of the yield suppression for J/$\psi$ and different $\Upsilon$ states allow a comprehensive study of binding energy dependent modifications to the quarkonium production in the medium. In addition, the first measurement of J/$\psi$ polarization in heavy-ion collisions at RHIC will also be shown in both Helicity and Collins-Soper frames, which provides a new angle for studying QGP properties and the J$/\psi$ production mechanism in these collisions.  




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