Thermal photon $v_2$ with slow quark chemical equilibration

Abstract

Elliptic flow of direct photons in high-energy heavy ion collisions has been a topic of great interest as it is experimentally found larger than most hydrodynamic expectations. I discuss the implication of possible late formation of quark component in the hot QCD medium on the photon elliptic flow as quarks are the source of thermal photons in the deconfined phase. Hydrodynamic equations are numerically solved with the evolution equations for quark and gluon number densities. The numerical results suggest that thermal photon $v_2$ is visibly enhanced by the slow chemical equilibration of quarks and gluons, reducing the aforementioned problem.

5 pages, 3 figures

References in corpus (5)

• Elliptic and triangular flow in event-by-event (3+1)D viscous hydrodynamics
• Anisotropic flow in sqrt(s)=2.76 TeV Pb+Pb collisions at the LHC
• Elliptic flow of thermal photons and formation time of quark gluon plasma at RHIC
• Enhancement of thermal photon production in event-by-event hydrodynamics
• The Magneto-Sono-Luminescence and its signatures in photon and dilepton production in heavy ion collisions

Cited by in corpus (6)

• Production and Elliptic Flow of Dileptons and Photons in the semi-Quark Gluon Plasma
• Universal Parametrization of Thermal Photon Rates in Hadronic Matter
• Benchmarking a Non-Equilibrium Approach to Photon Emission in Relativistic Heavy-Ion Collisions
• Constraining the equation of state with identified particle spectra
• Effects of quark chemical equilibration on thermal photon elliptic flow
• Hydrodynamic modeling of a pure-glue initial scenario in high-energy hadron and heavy-ion collisions