Infrared sensitivity of screening and damping in a quark-gluon plasma
- Institut fuer Theoretische Physik, Universitaet Hannover, Appelstrasse 2, D-30167 Hannover (Germany)
- DESY, Theory Group, Notkestrasse 85, D-22603 Hamburg (Germany)
All the next-to-leading order contributions to the quasiparticle dispersion laws of a quark-gluon plasma, which, because of infrared singularities, are sensitive to the magnetic-mass scale, are calculated using Braaten-Pisarski resummation. These relative-order-{ital g}ln({ital g}) corrections are shown here to contribute generally to the dynamical screening of gluonic fields with frequencies below the plasma frequency as well as to the damping of propagating gluonic and fermionic quasiparticles. In the limit of a vanishing wave vector the infrared singularities disappear, but in a way that raises the possibility for formally higher orders of the Braaten-Pisarski scheme to contribute equally at next-to-leading order when the wave vector is of the order of or less than the magnetic-mass scale. This is argued to be a problem in particular for the fermionic damping rate.
- OSTI ID:
- 115945
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 5 Vol. 52; ISSN 0556-2821; ISSN PRVDAQ
- Country of Publication:
- United States
- Language:
- English
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