Electromagnetic Emission Rates and Spectral Sum Rules

Details Electromagnetic Emission Rates and Spectral Sum Rules Electromagnetic Emission Rates and Spectral Sum Rules

1998-02-05

arxiv.org/abs/hep-ph/9802256v1

Nucl.Phys. A638 (1998) 495c-498c

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages (Latex), 2 embedded ps figures, espcrc1 style, talk given at Quark Matter 97, December 97, Tsukuba, Japan

Scientific paper

10.1016/S0375-9474(98)00339-X

The electromagnetic emission rates at SPS energies satisfy spectral constraints in leading order in the pion and nucleon densities. These constraints follow from the strictures of broken chiral symmetry. We saturate these constraints using available data, leading to model independent emission rates from a hadronic gas. With a simple fire-ball scenario, only large nucleon densities may account for the present CERES data.

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