Speaker
Description
The PHENIX experiment at RHIC has a special ability to detect muons at the region $1.2<|y|<2.2$ from heavy quarks which are studied extensively to understand their production and modification in high energy hadron-hadron collisions. Quarkonia states like $J/\psi$ and $\psi(2S)$ of different binding energies are expected to have their yields modified differently by the medium or comoving particles. The $\psi(2S)$ is significantly more suppressed than $J/\psi$ in heavy-ion collisions by color screening effect. Quarkonia production in small collision systems like $p$+$A$ collisions is also modified due to the initial state and final state effects, and a relative modification between $J/\psi$ and $\psi(2S)$ can provide important information on final state effects. We have been studied the multiplicity dependence of the production of $J/\psi$ and $\psi(2S)$ in $p$+$p$ collisions at PHENIX to analyze the behavior of the potentially smallest QGP (collision system). In this poster, we will present the status of this study along with recent measurements of $J/\psi$ and $\psi(2S)$ in $p$+$p$ collisions at $\sqrt{s_{NN}}=200$ GeV with other experiments and theoretical models.
