Effects of the regularization on the restoration of chiral and axial symmetries
Journal Article
·
· Physical Review. D, Particles Fields
- Departamento de Fisica, Universidade de Coimbra, P-3004-516 Coimbra (Portugal)
The effects of a type of regularization for finite temperatures on the restoration of chiral and axial symmetries are investigated within the SU(3) Nambu-Jona-Lasinio model. The regularization consists in using an infinite cutoff in the integrals that are convergent at finite temperature, a procedure that allows one to take into account the effects of high momentum quarks at high temperatures. It is found that the critical temperature for the phase transition is closer to lattice results than the one obtained with the conventional regularization, and the restoration of chiral and axial symmetries, signaled by the behavior of several observables, occurs simultaneously and at a higher temperature. The restoration of the axial symmetry appears as a natural consequence of the full recovering of the chiral symmetry that was dynamically broken. By using an additional ansatz that simulates instanton suppression effects, by means of a convenient temperature dependence of the anomaly coefficient, we found that the restoration of U(2) symmetry is shifted to lower values, but the dominant effect at high temperatures comes from the new regularization that enhances the decrease of quark condensates, especially in the strange sector.
- OSTI ID:
- 21250165
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AXIAL SYMMETRY
CHIRAL SYMMETRY
CHIRALITY
CRITICAL TEMPERATURE
INSTANTONS
LATTICE FIELD THEORY
PHASE TRANSFORMATIONS
QUANTUM CHROMODYNAMICS
QUARK CONDENSATION
QUARKS
SIMULATION
SU-3 GROUPS
SYMMETRY BREAKING
TEMPERATURE DEPENDENCE
U-2 GROUPS
UNITARY SYMMETRY
AXIAL SYMMETRY
CHIRAL SYMMETRY
CHIRALITY
CRITICAL TEMPERATURE
INSTANTONS
LATTICE FIELD THEORY
PHASE TRANSFORMATIONS
QUANTUM CHROMODYNAMICS
QUARK CONDENSATION
QUARKS
SIMULATION
SU-3 GROUPS
SYMMETRY BREAKING
TEMPERATURE DEPENDENCE
U-2 GROUPS
UNITARY SYMMETRY