Latest results on $\Upsilon$ production in heavy-ion collisions from the STAR experiment

TL;DR

This paper presents recent measurements of $$ meson production in heavy-ion collisions at RHIC, focusing on nuclear modification factors and suppression patterns to understand quark-gluon plasma effects.

Contribution

It provides new experimental data on $$ suppression and nuclear modification factors in U+U and Au+Au collisions at RHIC energies, including their dependence on collision centrality and binding energy.

Findings

Observed suppression of $$(1S) and $$(2S+3S) states.

Nuclear modification factors vary with the number of participants.

Suppression correlates with quark-antiquark binding energy.

Abstract

We report on the latest measurements of the production of $\Upsilon$ mesons in heavy-ion collisions from the STAR experiment at RHIC. New measurements of the nuclear modification factors of the $\Upsilon$(1S+2S+3S) and $\Upsilon$(1S) states in U+U collisions at $\sqrt{s_{NN}}$ = 193 GeV are presented as a function of the number of participants ($N_{part}$) in the collisions. In addition, the suppression of $\Upsilon$(1S) and $\Upsilon$(2S+2S) is presented versus the quark-antiquark binding energy. Preliminary results on Upsilon suppression in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV, reconstructed via the dimuon channel, are also reported.