Regular Article – Theoretical Physics
Baryonic sources of thermal photons
Piedmont College, 30535, Demorest, GA, USA
2 Department of Physics and Astronomy, Cyclotron Institute, Texas A&M University, College Station, 77843, TX, USA
Accepted: 6 November 2020
Published online: 20 November 2020
Thermal radiation of photons and dileptons from hadronic matter plays an essential role in understanding electromagnetic emission spectra in high-energy heavy-ion collisions. In particular, baryons and anti-baryons have been found to be strong catalysts for electromagnetic radiation, even at collider energies where the baryon chemical potential is small. Here, we conduct a systematic analysis of - and -meson-induced reactions off a large set of baryon states. The interactions are based on effective hadronic Lagrangians where the parameters are quantitatively constrained by empirical information from vacuum decay branchings and scattering data, and gauge invariance is maintained by suitable regularization procedures. The thermal emission rates are computed using kinetic theory but can be directly compared to previous calculations using hadronic many-body theory. The comparison to existing calculations in the literature reveals our newly identified contributions to be rather significant.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020