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Dresden 2000 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 14: Postersitzung / Theorie

HK 14.42: Poster

Donnerstag, 23. März 2000, 10:15–12:45, B 113

Dilepton rates from hot and dense matter — •Roland Schneider and Wolfram Weise — Technische Universität München

Lattice QCD simulations suggest that hadronic matter ’melts’ at temperatures of about TC = 150 MeV and dissolves into a gas of weakly interacting quarks and gluons. Such phenomena are probed in ultrarelativistic heavy ion collisions. Emitted lepton pairs carry signatures of the hot and dense medium produced at early stages of such collisions. We calculate the dilepton emission rate from the hadronic and quark-gluon plasma phase using finite temperature field theory. Above TC, we work with thermally excited quark-antiquark pairs, below TC we use an improved Vector Meson Dominance Model to model the relevant hadronic degrees of freedom, the π, K, ρ, ω and φ mesons. We compare our results with data from the CERES/NA45 experiment and find good agreement. As a side effect, we find that the ω meson broadens considerably at T > 50 MeV due to its scattering off thermally excited pions.
(supported in part by BMBF and GSI)

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