Artículos de revistas
Interplay of dynamical and explicit chiral symmetry breaking effects on a quark
Fecha
2019-05-01Registro en:
Physical Review D, v. 99, n. 9, 2019.
2470-0029
2470-0010
10.1103/PhysRevD.99.094027
2-s2.0-85066957217
Autor
DCTA
Universidade Estadual Paulista (UNESP)
Universidade Cruzeiro Do sul
Institución
Resumen
The relative contributions of explicit and dynamical chiral symmetry breaking in QCD models of the quark-gap equation are studied in dependence of frequently employed Ansätze for the dressed interaction and quark-gluon vertex. The explicit symmetry breaking contributions are defined by a constituent-quark sigma term whereas the combined effects of explicit and dynamical symmetry breaking are described by a Euclidean constituent-mass solution. We extend this study of the gap equation to a quark-gluon vertex beyond the Abelian approximation complemented with numerical gluon- and ghost-dressing functions from lattice QCD. We find that the ratio of the sigma term over the Euclidean mass is largely independent of nonperturbative interaction and vertex models for current-quark masses, mu,d(μ)≤m(μ)≤mb(μ), and equal contributions of explicit and dynamical chiral symmetry breaking occur at m(μ)≈400 MeV. For massive solutions of the gap equation with lattice propagators this value decreases to about 220 MeV.