Artigo
Critical coupling for dynamical chiral-symmetry breaking with an infrared finite gluon propagator
Fecha
1997-01-30Registro en:
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v. 392, n. 3-4, p. 444-451, 1997.
0370-2693
10.1016/S0370-2693(96)01573-0
WOS:A1997WE56700033
2-s2.0-0039385920
Autor
Universidade Estadual Paulista (Unesp)
Resumen
We compute the critical coupling constant for the dynamical chiral-symmetry breaking in a model of quantum chromodynamics, solving numerically the quark self-energy using infrared finite gluon propagators found as solutions of the Schwinger-Dyson equation for the gluon, and one gluon propagator determined in numerical lattice simulations. The gluon mass scale screens the force responsible for the chiral breaking, and the transition occurs only for a larger critical coupling constant than the one obtained with the perturbative propagator. The critical coupling shows a great sensibility to the gluon mass scale variation, as well as to the functional form of the gluon propagator.