Addendum to the Test of CP Violation in Tau Decay

Abstract

We discuss the test of CP and CPT violation in $\tau$ decay without using the polarized electron beam by comparing partial fractions of ${\tau }^{-}$ and ${\tau }^{+}$ decay into channels with strong final state interactions. For example, $\Gamma ({\tau }^{-}\text{rarrow}{\pi }^{-}+{\pi }^0+\nu )\ne \Gamma ({\tau }^{+}\text{rarrow}{\pi }^{+}+{\pi }^0+\nu )$ signifies violation of CP. The optimum energy to investigatge CP violation in $\tau$ decay is discussed. We conclude that this energy is a few MeV below $\psi (2s)$ in order to avoid the charm contribution and over abundance of hadrons at the $\psi (2s)$ peak.

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