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HK: Physik der Hadronen und Kerne

HK 25: Theorie IV

HK 25.1: Talk

Tuesday, March 20, 2001, 16:30–16:45, F

Model for Dilepton Production from an Expanding Fireball — •Thorsten Renk, Roland Schneider, and Wolfram Weise — Technische Universität München

Perturbative thermal field theory is unable to provide an accurate description of the thermodynamic properties of the quark-gluon plasma (QGP) phase in an expanding fireball. We propose an approach which uses a quasiparticle description of the QGP phase motivated by thermal lattice QCD where nonperturbative input in terms of thermally generated effective quark and gluon masses is used. Including effects of finite baryon density and temperature on the hadronic spectral function, we show that this approach is able to describe the dilepton yield in Pb-Au collisions as measured by CERES/NA45. We discuss regions of the spectrum which are most sensitive to details of the fireball evolution and propose key observables in future measurements.

Work supported in part by BMBF and GSI.