Known decays of a_1(1260)-

(Only the first generation of decays, no cascades)

Final state Branching
$a^{-}_{1}(1260)$ $\to$ $\rho^{0}_{}(770)$ $\pi^{-}_{}$ 4.9e-1
$a^{-}_{1}(1260)$ $\to$ $\rho^{-}_{}(770)$ $\pi^{0}_{}$ 5.0e-1