Directed flow of open charm in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV using a quark coalescence model

TL;DR

This study investigates the directed flow of open charm mesons in high-energy gold collisions using a multi-phase transport model, revealing that charm quarks retain more initial condition information than light quarks, with significantly larger flow magnitudes.

Contribution

It demonstrates that charm quarks exhibit a much larger directed flow than light quarks in Au+Au collisions, highlighting their potential to probe initial collision conditions.

Findings

Charm quark $v_{1}$ is about 7 times larger than light quarks at large rapidity.

Charm quarks retain more initial condition information than light quarks.

$D^{0}$ meson $v_{1}$ is significantly larger than that of pions at large rapidity.

Abstract

The directed flow ($v_{1}$) of open charm meson ($D^{0}$) is studied in Au+Au collisions at $\sqrt{s_{NN}}$ = 200~GeV using A Multi-Phase Transport (AMPT) model framework with partonic interactions (string melting version). Within this framework, it is found that although the initial spatial eccentricity ($\epsilon_{1}$) of charm quark is smaller than light quarks, the charm quark $v_{1}$ magnitude is found to be approximately 7 times larger than that of the light u quark at large rapidity. This indicates that the charm quarks can retain more information from initial condition than the light quarks. We have studied the directed flow of $D^{0}$ as a function of rapidity and transverse momentum using quark coalescence as the mechanism for hadron production. Like charm quark, the $D^{0}$ $v_{1}$ magnitude is found to be about 7 times larger than that of the light ($\pi$) hadrons at large rapidity.