It is shown that U(3)L×U(3)R eight-quark interactions stabilize the asymmetric ground state of the well-known model with four-quark Nambu -- Jona-Lasinio and six-quark 't Hooft interactions. The result remains when the reduced SU(3) f\mbox{}lavour symmetry is explicitly broken by the general current quark mass term with m^u=m^d=m^s.
@article{arxiv.hep-ph/0508058,
title = {Multi-quark interactions with a globally stable vacuum},
author = {Alexander A. Osipov and Brigitte Hiller and Joao da Providencia},
journal= {arXiv preprint arXiv:hep-ph/0508058},
year = {2009}
}
Comments
LaTeX, 17 pages, 2 figures, version to appear in Phys. Lett. B