Probing violation of CP & T invariance in the transitions of τ leptons

Abstract

The SM predicts zero value for {\bf CP} \& {\bf T} violation in the decays of $\tau$ leptons -- except ${\tau }^{-}\to \nu K_S[{\pi }^{-}/{\pi }^{-}{\pi }^0...]$. Our community could establish impact of New Dynamics (ND) in a {\bf CP} asymmetry in a semi-hadronic $\tau$ transition and later in a second one. To be `practical', I suggest to our experimental colleagues to probe ${\tau }^{-}\to \nu {\bar{K}}^0[{\pi }^{-}/{\pi }^{-}{\pi }^0/{\pi }^{-}\eta ]$and ${\tau }^{-}\to \nu K^{-}[{\pi }^0/{\pi }^{+}{\pi }^{-}/\eta ]$. While I had mostly given comments about {\bf CP} violation in $\tau$ transitions, some theorists have shown how ND models could produce {\bf CP} asymmetries; I will discuss these ones, although sometimes I am not a true theorist, but as a phenomenalist here. I can hardly `dream' that {\bf CP} asymmetry in $\tau$ decays could connected with our huge asymmetry in `our' matter vs. anti-matter.

10 pages, 4 figures

References in corpus (2)

• CP violation and electric-dipole-moment at low energy $\tau$ production with polarized electrons
• "Could Charm (\& $\tau$) Transitions be the `Poor Princesses' of Deeper Understanding of Fundamental Dynamics?" -- or -- "Finding Novel Forces?"