The Role of Nucleons in Electromagnetic Emission Rates

Details The Role of Nucleons in Electromagnetic Emission Rates The Role of Nucleons in Electromagnetic Emission Rates

1999-01-22

arxiv.org/abs/hep-ph/9901385v2

Phys.Rev. D60 (1999) 037502

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 7 figures, minor changes

Scientific paper

10.1103/PhysRevD.60.037502

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 emphasized that the thermalized hadronic gas can be considered dilute.

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