Perturbative approach to UA(1) breaking
Abstract
The six-quark instanton induced 't Hooft interaction is considered in combination with the Nambu-Jona-Lasinio (NJL) type UL(3)X UR(3) chiral symmetric Lagrangian. We discuss the bosonization of this multi-quark interaction, taking the UA(1) breaking as a perturbation. We discuss its relation with the usual approach.
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