Baryonic Sources of Thermal Photons

TL;DR

This paper investigates how baryons influence thermal photon emission in high-energy heavy-ion collisions, revealing significant contributions from baryon-induced reactions using a systematic, empirically constrained hadronic model.

Contribution

It provides a comprehensive analysis of baryon-induced reactions on mesons, identifying previously unaccounted contributions to thermal photon emission rates.

Findings

Baryons significantly enhance electromagnetic radiation in heavy-ion collisions.

New reaction channels involving baryons contribute notably to photon emission rates.

The model aligns well with existing theoretical calculations, highlighting the importance of baryonic effects.

Abstract

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 $\pi$- and $\omega$-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.