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HK: Hadronen und Kerne
HK 24: Heavy Ion Reactions III, Ultrarelativistic Energies
HK 24.5: Gruppenbericht
Dienstag, 17. März 1998, 15:15–15:45, P
Hard Thermal Loop Resummation Technique in Non-Equilibrium — •M.H. Thoma1, M.E. Carrington2, and H. Defu3 — 1Institut für Theoretische Physik, Universität Giessen, 35392 Giessen — 2Physics Department, Brandon University, Brandon Manitoba R7A 6A9, Canada — 3Institute of Particle Physics, Huazhong Normal University, 430070 Wuhan, China
The hard thermal loop (HTL) resummation technique has been proved to be a powerful method for predicting properties and signatures of an equilibrated quark-gluon plasma (QGP) possibly formed in ultrarelativistic heavy ion collisions [1]. However, the use of this method is restricted by the fact that the fireball is not in equilibrium at least for the early stage of the collision. Here we present an extension of the HTL resummation technique to non-equilibrium situations starting from the real time formalism in the Keldysh representation [2]. As a first example we calculate the HTL photon self energy, from which we obtain the resummed photon propagator. This propagator is applied to the computation of the damping rate of a hard electron in a non-equilibrium QED plasma. In particular we discuss the role of pinch terms in these quantities. As an example we consider the case of a chemical non-equilibrium. Furthermore, we show that the HTL electron propagator and the HTL electron-photon vertex fulfill the Ward identity also in non-equilibrium [3].
[1] M.H. Thoma, in: "Quark-Gluon Plasma 2", ed.: R.C. Hwa (World Scientific, Singapore 1995), p.51
[2] M.E. Carrington, H. Defu, and M.H. Thoma, hep-ph/9708363, submitted to Phys. Rev. D.
[3] M.E. Carrington, H. Defu, and M.H. Thoma, in preparation