Event-plane decorrelation of photons produced in the early stage of heavy-ion collisions

Abstract

We study photon production in the early stage of heavy-ion collisions using a multistage model combining IP-Glasma, Kø{}MPø{}ST and relativistic hydrodynamics. We discuss the small momentum anisotropy of these photons, highlighting the role of the photon-hadron event-plane decorrelation. We comment that this singular characteristic of early photons could be used to provide dynamical information on the complex pre-hydrodynamics phase of heavy-ion collisions.

Comments: 5 pages, 2 figures, contribution to proceedings of 10th Hard and Electromagnetic Probes International Conference (HP2020)