Probing violation of CP & T invariance in the transitions of {\tau} leptons

TL;DR

This paper discusses the potential for detecting CP and T violation in tau lepton decays as a sign of new physics beyond the Standard Model, proposing specific decay channels for experimental investigation.

Contribution

It suggests practical experimental approaches to probe CP violation in tau decays and discusses how new physics models could generate observable asymmetries.

Findings

Standard Model predicts zero CP violation in tau decays except specific modes.

Proposes specific tau decay channels for experimental CP violation searches.

Highlights potential links between tau CP asymmetries and new physics models.

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.