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)