Vector-axial-vector mixing from a chiral effective field theory at finite temperature

Journal Article · Mon Dec 01 00:00:00 EST 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.114003· OSTI ID:21250991

Harada, Masayasu ^[1]; Sasaki, Chihiro; Weise, Wolfram ^[2]

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1. Department of Physics, Nagoya University, Nagoya, 464-8602 (Japan)
2. Physik-Department, Technische Universitaet Muenchen, D-85747 Garching (Germany)

We study the vector-axial-vector mixing in a hot medium and its evolution toward the chiral phase transition using different symmetry restoration scenarios based on the generalized hidden local symmetry framework. We show that the presence of the a{sub 1} meson reduces the vector spectral function around the {rho} meson mass and enhances it around the a{sub 1} meson mass. The coupling strength of a{sub 1} to {rho} and {pi} vanishes at the critical temperature due to the degenerate {rho}-a{sub 1} masses. This feature holds rigorously in the chiral limit and still stays intact to good approximation for the physical pion mass.

• OSTI ID: 21250991
• Journal Information: Physical Review. D, Particles Fields, Vol. 78, Issue 11; Other Information: DOI: 10.1103/PhysRevD.78.114003; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
APPROXIMATIONS
CHIRALITY
COUPLING
CRITICAL TEMPERATURE
EVOLUTION
FIELD THEORIES
MASS
MIXING
PHASE TRANSFORMATIONS
PIONS
SPECTRAL FUNCTIONS
SYMMETRY
V-A THEORY
VECTORS