Thermal photon emission from the πρω system
Abstract
We investigate thermal photon emission rates in hot hadronic matter from a system consisting of π, ρ, and ω 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 ω →π0 γ 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 πρ → πγ processes in the energy regime of 1-3 GeV. We expect that our new sources will provide a non-negligible contribution to the total hadronic rates, thereby enhancing calculated thermal photon spectra from heavy-ion collisions, which could improve the description of current direct-photon data from experiment.
- Publication:
-
Nuclear Physics A
- Pub Date:
- January 2016
- DOI:
- 10.1016/j.nuclphysa.2015.09.008
- arXiv:
- arXiv:1506.09205
- Bibcode:
- 2016NuPhA.945....1H
- Keywords:
-
- Thermal photons;
- Photon spectra;
- v<SUB>2</SUB>;
- Thermal field theory;
- Kinetic theory;
- Photon emission;
- High Energy Physics - Phenomenology;
- Nuclear Theory
- E-Print:
- 14 pages, 16 figures, published in Nuclear Physics A