Aspects of Dynamical Chiral Symmetry Breaking

Abstract

Dynamical chiral symmetry breaking is a nonperturbative phenomenon that may be studied using QCD's gap equation. Model-independent results can be obtained with a nonperturbative and symmetry preserving truncation. The gap equation yields the massive dressed-quark propagator, which has a spectral representation when considered as a function of the current-quark mass. This enables an explication of the connection between the infrared limit of the QCD Dirac operator's spectrum and the quark condensate appearing in the operator product expansion.

arXiv comment11, LaTeX2e, ws-procs9x6; contribution to proceedings of the "5th International Conference on Quark Confinement and the Hadron Spectrum," Gargnano, Italy, 10-14/Sept./03