CP Violation in $\tau \to 3\pi {\nu }_{\tau }$

S. Y. Choi, K. Hagiwara, M. Tanabashi

We consider CP violating effects in the decays $\tau \to (3\pi ){\nu }_{\tau }$ where both the ${\mathrm{J}}^{\mathrm{P}}=1^{+}$ resonance, $a_1$, and ${\mathrm{J}}^{\mathrm{P}}=0^{-}$ resonance, ${\pi }^{\prime }$, can co…