CP-violating correlations in electron-positron annihilation intoτleptons

Abstract

An analysis of CP-violating effects in $e^{+}$ $e^{\mathrm{-}}$→${\tau }^{+}$ ${\tau }^{\mathrm{-}}$ is outlined. Some tensor observables sensitive to CP-odd couplings arising from possible electric or weak dipole moments $d_{\tau }$,d${̃}_{\tau }$ of the τ are presented. For the case where both τ’s decay via τ→π${\nu }_{\tau }$ we estimate the accuracies with which d${̃}_{\tau }$ and $d_{\tau }$ can be measured at the Z resonance and at a τ-charm or B factory, respectively.