Damping of energetic gluons and quarks in high-temperature QCD
- Department of Physics, McGill University, 3600 University Street, Montreal, Quebec, H3A2T8 (Canada)
When a gluon or a quark is sent through the hot QCD plasma it acquires a damping rate that is given by {gamma}({bold p})={ital cg}{sup 2} ln(1/{ital g}){ital T}+{ital O}({ital g}{sup 2}{ital T}) for {vert bar}{bold p}{vert bar}{much gt}{ital gT}. We show that very simple arguments suffice to fix the numerical coefficient {ital c} in this expression and to show that the {ital O}({ital g}{sup 2}{ital T}) contributon is incalculable in perturbation theory without further assumptions. For QCD with {ital N}{sub {ital c}} colors we find {ital c}{sub {ital g}}=+{ital N}{sub {ital c}}/4{pi} for gluons and {ital c}{sub {ital q}}=+({ital N}{sub {ital c}}{sup 2}{minus}1)/8{pi}{ital N}{sub {ital c}} for quarks, in agreement with more detailed calculations of Pisarski {ital et} {ital al}. but not with those of Lebedev {ital et} {ital al}. The simplicity of the calculation permits a direct verification of the gauge invariance and the physical sign of the result.
- OSTI ID:
- 5135948
- Journal Information:
- Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 45:1; ISSN PRVDA; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
DAMPING
DISPERSION RELATIONS
DISTRIBUTION FUNCTIONS
ELEMENTARY PARTICLES
ENERGY LOSSES
FERMIONS
FIELD THEORIES
FUNCTIONS
GAUGE INVARIANCE
GLUONS
INFRARED DIVERGENCES
INVARIANCE PRINCIPLES
LOSSES
MATTER
PERTURBATION THEORY
PLASMA
POSTULATED PARTICLES
PROPAGATOR
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MATTER
QUARKS
TEMPERATURE DEPENDENCE
VACUUM POLARIZATION