Analysis of a quenched lattice-QCD dressed-quark propagator
Abstract
Quenched lattice-QCD data on the dressed-quark Schwinger function can be correlated with dressed-gluon data via a rainbow gap equation so long as that equation’s kernel possesses enhancement at infrared momenta above that exhibited by the gluon alone. The required enhancement can be ascribed to a dressing of the quark-gluon vertex. The solutions of the rainbow gap equation exhibit dynamical chiral symmetry breaking and are consistent with confinement. The gap equation and related, symmetry-preserving ladder Bethe-Salpeter equation yield estimates for chiral and physical pion observables that suggest these quantities are materially underestimated in the quenched theory; |<q¯q>| by a factor of 2 and fπ by 30%.
- Publication:
-
Physical Review C
- Pub Date:
- July 2003
- DOI:
- 10.1103/PhysRevC.68.015203
- arXiv:
- arXiv:nucl-th/0304003
- Bibcode:
- 2003PhRvC..68a5203B
- Keywords:
-
- 12.38.Lg;
- 12.38.Gc;
- 12.38.Aw;
- 24.85.+p;
- Other nonperturbative calculations;
- Lattice QCD calculations;
- General properties of QCD;
- Quarks gluons and QCD in nuclei and nuclear processes;
- Nuclear Theory;
- High Energy Physics - Lattice;
- High Energy Physics - Phenomenology;
- Nuclear Experiment
- E-Print:
- 9 pages, LaTeX2e, REVTEX4, 6 figures