Negative Elliptic Flow of $J/\psi$'s: A Qualitative Signature for Charm Collectivity at RHIC

TL;DR

The paper suggests that the observed negative elliptic flow of $J/$ mesons at RHIC indicates charm quark collectivity, with a lower limit on charm quark transverse velocity compatible with light quark flow.

Contribution

It introduces the negative elliptic flow of $J/$ as a qualitative signature of charm quark collectivity at RHIC and estimates the necessary charm quark transverse velocity.

Findings

Negative $v_2$ observed for $J/$ at intermediate $p_T$

Negative elliptic flow implies charm quark collectivity

Charm quark transverse velocity estimated at 0.55-0.6c

Abstract

We discuss one of the most prominent features of the very recent preliminary elliptic flow data of $J/\Psi$ meson from the PHENIX collaboration \cite{Silvestre:2008tw}. Even within the the rather large error bars of the measured data a negative elliptic flow parameter ($v_2$) for $J/\Psi$ in the range of $p_T=0.5-2.5 \GeV/c$ is visible. We argue that this negative elliptic flow at intermediate $p_T$ is a clear and qualitative signature for the collectivity of charm quarks produced in nucleus-nucleus reactions at RHIC. Within a parton recombination approach we show that a negative elliptic flow puts a lower limit on the collective transverse velocity of heavy quarks. The numerical value of the transverse flow velocity $\beta_T$ for charm quarks that is necessary to reproduce the data is $\beta_T(charm)\sim 0.55-0.6c$ and therefore compatible with the flow of light quarks.