Covariant Model for Dynamical Quark Confinement

Based on a recent manifestly covariant time-ordered approach to the relativistic many-body problem, the quark propagator is defined by a nonlinear Dyson--Schwinger-type integral equation, with a one-gluon loop. The resulting energy-dependent quark mass is such that the propagator is singularity-free for real energies, thus ensuring confinement. The self-energy integral converges without regularization, due to the chiral limit of the quark mass itself. Moreover, the integral determines the low-energy limit of the quark-gluon coupling constant, for which a value of $g^2/4\pi =4.712$ is found.Comment: 7 pages, REVTeX; 2 figures, available from the author (by fax, or as postscript files by email

Comment on ``Relativistic cluster dynamics of nucleons and mesons. II. Formalism and examples''

In a recent paper [Phys.\ Rev.\ C{\bf 49}, 2142 (1994)], Haberzettl presented cluster N-body equations for arbitrarily large systems of nucleons and mesons. Application to the three-nucleon system is claimed to yield a new kind of three-nucleon force. We demonstrate that these three-nucleon equations contain double counting.Comment: 6 pages in Revtex 3.0, 6 Postscript figures. Accepted for publication in Phys. Rev.

Covariant Model for Dynamical Quark Confinement

Based on a recent manifestly covariant time-ordered approach to the relativistic many-body problem, the quark propagator is defined by a nonlinear Dyson--Schwinger-type integral equation, with a one-gluon loop. The resulting energy-dependent quark mass is such that the propagator is singularity-free for real energies, thus ensuring confinement. The self-energy integral converges without regularization, due to the chiral limit of the quark mass itself. Moreover, the integral determines the low-energy limit of the quark-gluon coupling constant, for which a value of $g^2/4\pi =4.712$ is found.Comment: 7 pages, REVTeX; 2 figures, available from the author (by fax, or as postscript files by email