Charmonium is an important to probe the properties of the quark-gluon plasma (QGP) created in heavy-ion collisions due to the modification of its yield by the effects of dissociation and regeneration in QGP. About 2 billion events each in isobaric collisions ($^{96}_{44}Ru$ + $^{96}_{44}Ru$ and $^{96}_{40}Zr$ + $^{96}_{40}Zr$) at $\sqrt{s_\mathrm{NN}}$ = 200 GeV has been collected by STAR in...
The phase diagram of Quantum Chromodynamics (QCD) is a fundamental framework for understanding strongly interacting matter under extreme conditions. Heavy-ion collision experiments provide a unique opportunity to study the QCD phase transition between hadronic matter and quark-gluon plasma (QGP) by recreating high-temperature and/or high-baryon-density environments. Investigating this phase...
Heavy quarkonium states, predominantly generated via initial hard scatterings, traverse the evolution of the Quark-Gluon Plasma (QGP), thus serving as ideal probes to study the properties of the QGP. The suppression of these states due to color screening suggests direct evidence of QGP formation. In heavy-ion collisions, the strong electromagnetic fields produced by colliding nuclei can be...
Lattice QCD predicts a phase transition from hadronic matter to the Quark-Gluon Plasma (QGP) at high temperature and low baryon chemical potential. Thermal dileptons can be produced throughout the entire evolution of relativistic heavy-ion collisions and do not involve strong interactions. As a result, they can carry original information about their emission source, and are therefore suggested...
Photoproduction is the interaction with two nuclei collisions, a linearly polarized quasi-real photon from one nucleus can interact with the other nucleus to produce a vector meson, such as $\rho^{0}$. Recently, some measurements by various experiments in ultra-peripheral collisions have observed spin-interference in $\rho^{0}$ photoproduction from STAR, marking a breakthrough in Fermi-scale...
