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

We study photon production in the early stage of heavy-ion collisions using a multistage model combining IP-Glasma, \kompost{} 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.