Multi-quark interactions with a globally stable vacuum
Abstract
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) flavour symmetry is explicitly broken by the general current quark mass term with mu≠md≠ms.
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