Decay-product correlation ofτ+τ−frome+e−annihilation

Abstract

We analyze the ${\pi }^{+}{\pi }^{-}$ angular correlation for the process $e^{+}{e}^{-}\to {\tau }^{+}{\tau }^{-}$ with subsequent decays ${\tau }^{+}\to {\pi }^{+}{\overline{\nu }}_{\tau }$ and ${\tau }^{-}\to {\pi }^{-}{\nu }_{\tau }$ as a function of the ${\nu }_{\tau }$ mass as well as the proportion of $V+A$ to $V-A$ coupling strengths.