Speaker
Description
Nearly twenty $c\bar{c}$ pairs are produced in central Au+Au collisions at
the top RHIC energy of $\sqrt{s_{NN}}=$200 GeV, with the largest yields at
mid-rapidity. The enhanced production of charmonium states from combinations of independently produced charm quarks could contribute to the observation that, in Au+Au collisions at RHIC, J/$\psi$ yields are smaller at forward rapidity than at mid-rapidity relative to observations in $p+p$ collisions at the same energy. A signature of such charmonium coalescence could be the presence of J/$\psi$ flow. The PHENIX experiment collected a large sample of J/$\psi\rightarrow \mu^+\mu^-$ decays at the pseudorapidity region of 1.2$<\eta<$2.2 in Au+Au collisions during the 2014 and 2016 runs. These data will allow the most precise measurement so far of J/$\psi$ flow component $v_2$ in a region where the number of charm quark pairs is smaller than at mid-rapidity.
The PHENIX experiment has also a large sample of J$/\psi\rightarrow\mu^+\mu^-$ decays measured at a forward rapidity of 1.2$<\eta<$2.2 in $p$+$p$ and $p$+Au collisions at $\sqrt{s_{NN}}$=200 GeV. The yields can be measured as a function of the multiplicity determined over a broad range of rapidity, a golden channel for multiparton interaction studies. A comparison between yields observed in $p$+$p$ and $p$+Au at the same multiplicity could help explain how the multiparton interactions (in $p$+$p$) can affect the measurement of multinucleon interactions (in $p$+Au), as well as the measured nuclear modification factors, after evaluating the competing effects such as charmonium breakup in co-moving particles. This presentation will show preliminary results of J/$\psi$ azimuthal anisotropy and the status of the J/$\psi$ studies in different event activity categories.
