Münster 2002 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 16: Theory II
HK 16.5: Vortrag
Dienstag, 12. März 2002, 18:00–18:15, A
Thermal QCD on the Lattice: Quasiparticles And Confinement — •Roland A. Schneider1 and Wolfram Weise1,2 — 1Physik-Department, Technische Universität München, Garching, Germany — 2ECT*, Villazzano (Trento), Italy
We propose a novel quasiparticle interpretation of the equation of state
of deconfined QCD at finite
temperature. Using appropriate thermal masses, we introduce a
phenomenological parametrization of the
onset of confinement in the vicinity of the predicted phase transition.
Lattice results of the energy
density, the pressure and the interaction measure of pure SU(3) gauge
theory are excellently
reproduced. We find a relationship between the thermal energy density
of the Yang-Mills vacuum and the
chromomagnetic condensate ⟨ B2 ⟩T. Finally, an
extension to QCD with dynamical
quarks is discussed. Good agreement with lattice data for 2, 2+1 and 3
flavour QCD is obtained. We also
present the QCD equation of state for realistic quark masses.
Applications to dilepton production in heavy-ion collisions are
outlined. Published in Phys. Rev. C64 (2001) 055201.
Work supported in part by BMBF and GSI.