Photon yield and elliptic flow from gluon fusion and splitting induced by magnetic fields in relativistic heavy-ion collisions

by Prof. Alejandro Ayala (UNAM, Mexico City, Mexico)

Tuesday 13 Oct 2020, 19:30 → 21:30 Asia/Tehran

Online

Webinar on Quark Matter and Relativistic Hydrodynamics

Abstract:

We study the gluon fusion and the closely related gluon splitting process, that represent channels induced by the presence of a magnetic field in semicentral HIC's, for photon production. The aim is to compute the photon yield and elliptic flow coefficient. The calculation accounts for the high gluon occupation number at early times when the field strength is significant. We compare this excess to the difference between PHENIX data and recent hydrodynamic calculations for the photon transverse momentum distribution and elliptic flow coefficient v_2​. The time evolution of the field strength and reaction volume is computed using UrQMD. We show that with reasonable values for the saturation scale, the calculation helps to better describe the experimental results obtained at RHIC energies for the lowest part of the transverse photon momentum at different centralities.

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