Chiral transformations of spin-1 mesons in the non-symmetric vacuum

摘要

A new sort of chiral transformations for spin-1 states is obtained as a result of a linearized diagonalization of pi a(1) mixing in the effective meson Lagrangian. Using this symmetry argument, we argue that there is no physical distinction between such theory and the theory in which a covariant nonlinear diagonalization is used instead. As an illuminating example, the Nambu-Jona-Lasinio type model with the broken SU(2) x SU(2) chiral symmetry in the one quark-loop approximation is considered. (C) 2017 Elsevier Inc. All rights reserved.