Speaker
Description
Measurements of heavy quarkonium in heavy-ion collisions provide a powerful tool to study the properties of the Quark-Gluon Plasma (QGP). Due to the color screening effect, the dissociation of heavy quarkonium was proposed as a direct signature of the QGP formation. Compared to charmonia, bottomonia are cleaner probes because of negligible regeneration contribution at the top RHIC energy. Moreover, different $\Upsilon$ states are expected to dissociate at different temperatures depending on their binding energies. Measurement of such sequential suppression of the $\Upsilon$ states can be used to study the QGP's thermodynamic properties.
In this talk, we report the $\Upsilon$ measurements in Au+Au and isobar (Ru+Ru and Zr+Zr) collisions at $\sqrt{s_{NN}}=200$ GeV by the STAR experiment. The yields and nuclear modification factors are presented as a function of centrality and transverse momentum. Moreover, the results are compared to those at the LHC as well as theoretical calculations.
| Theory / experiment | Experiment |
|---|---|
| Group or collaboration name | STAR Collaboration |
