Speaker
Description
Quarkonia are excellent probes for studying the interactive properties of quark-gluon plasma formed in relativistic heavy-ion collisions. To correctly interpret the observed suppression of quarkonium production in $\text{Au}+\text{Au}$ collisions at $\sqrt{s_{\text{NN}}}$ = 200 GeV, the cold nuclear matter (CNM) effects in $p+\text{Au}$ collisions are quantified by the nuclear modification factor ($R_{p\text{Au}}$), given the long-established presumption that the energy density and the temperature produced in proton-nucleon collisions are insufficient to form QGP droplets. It is defined as the ratio of the yield of the quarkonium in $p+\text{Au}$ collisions to that in $p+p$ collisions, scaled by the average number of binary nucleon-nucleon collisions.
In this presentation, a study of cold nuclear matter (CNM) effects is reported based on STAR measurements of inclusive $J/\psi$ and $\Upsilon$ production in $p+p$ and $p+\text{Au}$ collisions at $\sqrt{s_\text{NN}}$ = 200 GeV. The $J/\psi$ $R_{p\text{Au}}$ is measured as a function of $p_{\text{T}}$, while the $\Upsilon$ $R_{p\mathrm{Au}}$ is measured separately as functions of $p_{\mathrm{T}}$ and $y$, with all other kinematic variables integrated over. The $J/\psi$ $R_{p\text{Au}}$ is consistent with unity, suggesting negligible modification of the yield by CNM effects in this kinematic region, while noticeable suppression for $\Upsilon$ is observed in covered kinematic ranges. Comparisons are made to results from other experiments as well as to model calculations and physics implications will also be discussed.
| Academic Status | I am postdoc within 5 years of obtaining doctoral degree |
|---|
