Low-energy Lagrangian for pseudoscalar mesons and the linear σ model
Andreev I. V. , Tsypin M. M.
The linear SU (3) X SU (3) σ model is shown to describe satisfactorily the low-energy interactions of pseudoscalar mesons if the corrections taking into account the vector-meson exchange are incorporated. Scalar mesons with a mass of about 1500 MeV arise in this theory.