Thermal photon emission from the pi-rho-omega system

Understand

We investigate thermal photon emission rates in hot hadronic matter from a system consisting of pi, rho, and omega mesons.

• The rates are calculated using both relativistic kinetic theory with Born diagrams as well as thermal field theory at the two-loop level.
• This enables us to cross-check our calculations and to manage a pole contribution that arises in the Born approximation corresponding to the omega -> pi^0 gamma radiative decay.
• After implementing hadronic form factors to account for finite-size corrections, we find that the resulting photo-emission rates are comparable to existing results from pi rho -> pi gamma processes in the energy regime of 1-3 GeV.