Hard thermal loops near the light-cone

Details Hard thermal loops near the light-cone Hard thermal loops near the light-cone

1996-08-22

arxiv.org/abs/hep-ph/9608410v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, LATeX. Invited talk at the Workshop on Quantum Chromodynamics, 3 - 8 June 1996, American University of Paris, France

Scientific paper

In hot gauge theories, perturbation theory at the scale of the Debye screening mass requires the resummation of the so-called hard thermal loops, which corresponds to using an effective action obtained by integrating out the modes with momentum of order of the temperature. As is well-known, quantities which are sensitive to the nonperturbative magnetic screening mass still remain incalculable in this resummed perturbation theory. A different breakdown of the latter occurs whenever external momenta are light-like, because the hard thermal loops themselves develop collinear singularities. However, taking into account asymptotic thermal masses for the hard modes regulates the hard thermal loops without spoiling their gauge invariance.

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