The heavy fermion damping rate puzzle

Abstract

: We examine again the problem of the damping rate of a moving heavy fermion in a hot plasma within the resummed perturbative theory of Pisarski and Braaten. The ansatz for its evaluation which relates it to the imaginary part of the fermion propagator pole in the framework of a self-consistent approach is critically analyzed. As already pointed out by various authors, the only way to define the rate is through additional implementation of magnetic screening. We show in detail how the ansatz works in this case and where we disagree with other authors. We conclude that the self-consistent approach is not satisfactory.

17 pages

Cited by in corpus (27)

• The Quark-Gluon Plasma: Collective Dynamics and Hard Thermal Loops
• Three-loop HTLpt thermodynamics at finite temperature and chemical potential
• Advances in perturbative thermal field theory
• Lifetimes of quasiparticles and collective excitations in hot QED plasmas
• Nonabelian Debye Screening in One-Loop Resummed Perturbation Theory
• Lifetime of quasiparticles in hot QED plasmas
• Dynamical renormalization group resummation of finite temperature infrared divergences
• The Bloch-Nordsieck propagator at finite temperature
• Dilepton rate and quark number susceptibility with the Gribov action
• Damping Rate of a Hard Photon in a Relativistic Plasma
• The Infrared Sensitivity of Screening and Damping in a Quark-Gluon Plasma
• Damping Rate of a Yukawa Fermion at Finite Temperature
• Non-perturbative dynamics of hot non-Abelian gauge fields: beyond leading log approximation
• Anomalous Kinetics of Hard Charged Particles: Dynamical Renormalization Group Resummation
• On the Damping Rate of a Fast Fermion in Hot QED
• Damping Rates and Mean Free Paths of Soft Fermion Collective Excitations in a Hot Fermion-Gauge-Scalar Theory
• An introduction to Thermal Field Theory and Some of its Application
• Three-loop HTLpt thermodynamics at finite temperature and chemical potential
• Hard Thermal Loop -- theory and applications
• Is \lq\lq Heavy Quark Damping Rate Puzzle'' in Hot QCD Really the Puzzle?
• Analytic Properties of Finite-Temperature Self-Energies
• Screening of mass singularities and finite soft-photon production rate in hot QCD
• Photon Production from a Quark--Gluon Plasma
• Mass-Shell Behavior of Electron Propagator at Low Temperature
• A simple criterion for effects beyond hard thermal loops
• Self-consistent determination of hard modes in hot QCD
• The electron thermal propagator at p>>T: An entire function of p_{0}