Is \lq\lq Heavy Quark Damping Rate Puzzle'' in Hot QCD Really the Puzzle?

Details Is \lq\lq Heavy Quark Damping Rate Puzzle'' in Hot QCD Really the Puzzle? Is \lq\lq Heavy Quark Damping Rate Puzzle'' in Hot QCD Really the Puzzle?

1994-04-21

arxiv.org/abs/hep-ph/9404318v1

Phys.Rev.Lett. 73 (1994) 2023-2026

Physics

High Energy Physics

High Energy Physics - Phenomenology

13pages, OCU-PHYS-154

Scientific paper

10.1103/PhysRevLett.73.2023

Within the framework of perturbative resummation scheme of Pisarski and Braaten, the decay- or damping-rate of a moving heavy quark (muon) to leading order in weak coupling in hot QCD (QED) is examined. Although, as is well known, the conventionally-defined damping rate diverges logarithmically at the infrared limit, shown is that no such divergence appears in the physically measurable decay rate. The cancellation occurs between the contribution from the \lq\lq real'' decay diagram and the contribution from the diagrams with \lq\lq thermal radiative correction''.

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