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: |<bar-q q>| by a factor of two and f_pi by 30%.
Keywords
Cite
@article{arxiv.nucl-th/0304003,
title = {Analysis of a quenched lattice-QCD dressed-quark propagator},
author = {M. S. Bhagwat and M. A. Pichowsky and C. D. Roberts and P. C. Tandy},
journal= {arXiv preprint arXiv:nucl-th/0304003},
year = {2010}
}
Comments
9 pages, LaTeX2e, REVTEX4, 6 figures