Extended NJL model with eight-quark interactions

TL;DR

This paper explores an extended three-flavor NJL model incorporating six- and eight-quark interactions, analyzing stability issues and phenomenological implications of multi-quark interactions in quantum chromodynamics.

Contribution

It introduces an extended NJL model with higher-order quark interactions and investigates their effects on stability and phenomenology.

Findings

Enhanced stability with eight-quark interactions

Implications for meson phenomenology

Insights into U(1)_A symmetry breaking

Abstract

We present the results obtained in the three-flavour ($N_f=3$) Nambu--Jona-Lasinio model which is extended by the $U(1)_A$ breaking six-quark 't Hooft interaction and eight-quark interactions. We address the problem of stability, and some phenomenological consequences of the models with multi-quark interactions.