QM 2022

J/ψ Forward rapidity azimuthal anisotropy in Au+Au collisions and multiplicity dependence in p+p and p+Au at sNN=200 GeV measured by the PHENIX Experiment

7 Apr 2022, 15:40

20m

medium aula B (Auditorium Maximum UJ)

Oral presentation Heavy flavors, quarkonia, and strangeness production Parallel Session T11: Heavy flavors, quarkonia, and strangeness production

Speaker

Luis Bichon (Vanderbilt University)

Description

Nearly twenty $c\overline{c}$ 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/$\psi \to {\mu }^{+}{\mu }^{-}$ 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$/\psi \to {\mu }^{+}{\mu }^{-}$ 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.

Presentation materials

Quark Matter Final Presentation.pdf