Constraining energy loss from high-$p_{\mathrm{T}}$ azimuthal asymmetries

Abstract

The nuclear modification factor $R_{\mathrm{AA}}$ has been satisfactorily described by various jet quenching models. Nonetheless, all these formalisms, until very recently, underpredicted the high-$p_{\mathrm{T}}$ (> 10 GeV) elliptic flow $v_2$. We find that the simultaneous description of these observables requires to strongly suppress the quenching for the first $\sim 0.6$ fm after the collision. This shows the potential of jet quenching observables to constrain the dynamics of the initial stages of the evolution.

Comments: Proceedings of the Hard Probes 2018 conference. 4 pages. 2 figures