The three-pion decays of the $a_1(1260)$

Xu Zhang, Ju-Jun Xie

We investigate the decay of $a_1^{+}(1260)\to {\pi }^{+}{\pi }^{+}{\pi }^{-}$ with the assumption that the $a_1(1260)$ is dynamically generated from the coupled channel $\rho \pi$ and $\bar{K}{K}^{\ast }$ interacti…