On the role of $a_1(1260)$ meson in the $\tau \to 4\pi {\nu }_{\tau }$ decay

Abstract

We demonstrate that a simple model successfully describing experimental data for the process $\text{epm}\to 4\pi$ can also qualitatively account for the data of CLEOII and ALEPH obtained recently for the decay $\tau \to 4\pi {\nu }_{\tau }$. The model is based on the assumption of the $a_1(1260)\pi$ and $\omega \pi$ dominance as intermediate states. Our observation is in contrast with the claim by ARGUS that the $\rho$-meson signal in the $\tau \to 4\pi {\nu }_{\tau }$ decay can not be explained by the $a_1\pi$ intermediate state.

Comments: 18 pages, 10 figures, LaTex