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Gauge covariant approach to the electroweak interactions of mesons in the Nambu-Jona-Lasinio model with spin-1 states
Authors: A. A. Osipov; B. Hiller; P. M. Zhang
Ref.: Mod. Phys. Lett. A 34, 36 (2019)
Abstract: An extended Nambu–Jona-Lasinio (NJL) model with chiral group U(2)×U(2) and spin-0 and spin-1 four quark interactions is used to develop the gauge covariant approach to the diagonalization of the π−a1 mixing in the presence of electroweak forces. This allows for manifestly gauge covariant description of both the non-anomalous and anomalous parts of the effective Lagrangian. It is shown that in the non-anomalous sector the theory is equivalent to the standard non-covariant approach.
