Prompt and Non-prompt $J/\psi$ Elliptic Flow in Pb+Pb Collisions at 5.02 TeV with the ATLAS Detector

The elliptic flow of prompt and non-prompt $J/\psi$ was measured in Pb+Pb collisions at $\sqrt{s_\text{NN}}=5.02$ TeV with an integrated luminosity of $0.42~\mathrm{nb}^{-1}$ with ATLAS at the LHC. The prompt and non-prompt signals are separated using a two-dimensional simultaneous fit of the invariant mass and pseudo-proper time in the dimuon decay channel. The measurement is performed in the kinematic range $9<p_\mathrm{T}<30$ GeV, $|y|<2$ and $0-60\%$ collision centrality. The elliptic flow is evaluated with respect to the event plane and the results are presented as a function of transverse momentum, rapidity and centrality. It is observed that prompt and non-prompt $J/\psi$ mesons have non-zero elliptic flow. Prompt $J/\psi$ $v_2$ decreases as a function of $p_\mathrm{T}$, while non-prompt $J/\psi$ $v_2$ is flat over the studied kinematical region. There is no observed dependence on rapidity or centrality.