Refraction of Gluon jet in QGP

TL;DR

This paper proposes a photon-like refraction model for gluon jets in quark-gluon plasma, explaining dihadron angular distributions and their dependence on jet type and energy, aligning qualitatively with experimental data.

Contribution

It introduces a novel refraction mechanism for gluon jets in QGP and combines it with energy loss to explain dihadron angular correlations.

Findings

Three peaks at intermediate $p_T$ due to quark-gluon interactions

Single peak at high $p_T$ dominated by quark-quark pairs

Qualitative agreement with experimental dihadron distribution data

Abstract

We introduce photon-like refraction for gluon jet in quark gluon plasma created in high energy nucleus-nucleus collisions. A quark jet goes straightly while a gluon jet is assumed to bend in the non-homogeneous medium. Combining refraction and energy loss, we calculate the away-side dihadron $\Delta\phi$ distribution in central $Au+Au$ collisions at RHIC energy. The dihadrons from quark-quark pair center around $\Delta\phi=\pi$, while the dihadrons from quark-gluon and gluon-gluon pair are deflected from $\Delta\phi=\pi$. The resulting distribution shows three peaks at intermediate $p_T$ since both quark-quark and quark-gluon are important. However we only observe one center peak at high $p_T$, where the quark-quark contribution dominates. These observation qualitatively agrees with the experiment data.