Role of nucleons in electromagnetic emission rates

James V. Steele, Ismail Zahed
1999 Physical Review D, Particles and fields  
Electromagnetic emission rates from a thermalized hadronic gas are important for the interpretation of dilepton signals from heavy-ion collisions. Although there is a consensus in the literature about rates for a pure meson gas, qualitative differences appear with a finite baryon density. We show this to be essentially due to the way in which the pi-N background is treated in regards to the nucleon resonances. Using a background constrained by unitarity and broken chiral symmetry, it is
more » ... etry, it is emphasized that the thermalized hadronic gas can be considered dilute.
doi:10.1103/physrevd.60.037502 fatcat:zqmiwdemzrd4hldggre4l6emh4