Charmonium Triangular Flow in High Energy Nuclear Collisions

TL;DR

This paper presents the first calculation of $J/psi$ triangular flow in high energy nuclear collisions, highlighting its sensitivity to medium properties and the role of charmonium regeneration.

Contribution

It introduces a novel calculation of charmonium triangular flow using transport and hydrodynamic equations, emphasizing the regeneration mechanism's importance.

Findings

Triangular flow $v_3$ is mainly due to charmonium regeneration.

$v_3$ is more sensitive to medium properties than elliptic flow.

First-time calculation of $J/psi$ $v_3$ in this context.

Abstract

We calculate, for the first time, $J/\psi$ triangular flow in high energy nuclear collisions. The charmonium motion in medium is controlled by a transport equation with loss and gain terms, and the evolution of the hot medium is governed by a single-shot hydrodynamic equation with a triangularly deformed initial condition. In comparison with the elliptic flow $v_2$, the triangular flow $v_3$ comes almost completely from the charmonium regeneration in the quark gluon plasma and therefore is more sensitive to the medium properties.