Gauge model for the pion mass and the rho' vector boson

We propose a gauge model which realizes the pseudo-Goldstone idea for the pion, and we calculate its mass. We find ${m_{\pi }}^2$ as a function of the ρ and A₁ masses and the mass and coupling constant of a new vector meson, which we tentatively identify as the recently discovered ρ′ vector boson. In our model, chiral symmetry is broken by the absence of the axial-vector partner of the ρ′.