Pions at finite temperature

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.49.1556· OSTI ID:5287992

Song, C ^[1]

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1. School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 (United States)

The properties of pions in hot hadronic matter are analyzed with an effective chiral Lagrangian which includes vector and axial-vector mesons. To obtain the dispersion relation and the absorptive properties of the pions in hot matter, the real and imaginary parts of the pion self-energy are calculated to one-loop order. The dispersion relation is very similar to that of free pions even at [ital T][similar to]160 MeV. The mean free path is estimated from the imaginary part of the self-energy. The mass is obtained from the pole position of the propagator and from the screening limit of the pion self-energy. Even though the deviation of the mass at finite temperature is small, both masses decrease as [ital T] increases. Pions remain massless in the chiral limit at finite temperature. Possible mixing of the pions with the [ital A][sub 1] mesons at finite temperature is discussed.

• DOE Contract Number: FG02-87ER40328
• OSTI ID: 5287992
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 49:3; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

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662240 -- Models for Strong Interactions-- (1992-)
662420 -- Properties of Mesons & Meson Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CHIRAL SYMMETRY
DISPERSION RELATIONS
ELEMENTARY PARTICLES
ENERGY
FIELD THEORIES
FUNCTIONS
HADRONS
LAGRANGIAN FUNCTION
MASS
MEAN FREE PATH
MESONS
PIONS
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SELF-ENERGY
SYMMETRY
TEMPERATURE DEPENDENCE