Dilepton Enhancement by Thermal Pion Annihilation in the CERES Experiment

Details Dilepton Enhancement by Thermal Pion Annihilation in the CERES Experiment Dilepton Enhancement by Thermal Pion Annihilation in the CERES Experiment

1996-07-26

arxiv.org/abs/nucl-th/9607055v1

Phys.Lett. B386 (1996) 429-436

Physics

Nuclear Physics

Nuclear Theory

9 pages, RevTex, 4 eps figures, To appear in Phys. Lett. B

Scientific paper

10.1016/0370-2693(96)00908-2

We compare the recent CERES data on dielectron production in 200 GeV/u S+Au collisions with the theoretical predictions due to pion annihilation in a thermal hadronization and a string fragmentation scenario. Both models yield similar results for the dilepton mass spectrum. A satisfactory description of the experimental spectrum requires an in-medium reduction of the rho-mass and a freeze-out temperature of about 150 MeV in the thermal model. We emphasize and discuss the influence of experimental acceptance and resolution corrections.

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