The Role of Nucleons in Electromagnetic Emission Rates

Abstract

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.

9 pages, 7 figures, minor changes

References in corpus (5)

• A Microscopic Calculation of Photoabsorption Cross Sections on Protons and Nuclei
• Dilepton and Photon Emission Rates from a Hadronic Gas II
• Dilepton and Photon Emission Rates from a Hadronic Gas III
• e+e- yields in Pb+Au collisions at 158 AGeV/c: Assessment of baryonic contributions
• Electromagnetic Emission Rates and Spectral Sum Rules

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• The Vector Probe in Heavy-Ion Reactions
• Photon and dilepton emission rates from high density quark matter
• Isospin Fluctuations in QCD and Relativistic Heavy-Ion Collisions
• Dileptons and Medium Effects in Heavy-Ion Collisions
• Master formula approach to broken chiral U(3)xU(3) symmetry