Effects of anomalous charged current dipole moments of the tau on the decay $\tau^-\to\nu_\tau\pi^-\pi^0$

TL;DR

This paper investigates how anomalous charged current dipole moments of the tau lepton influence its decay into a neutrino and pions, providing bounds on these moments based on experimental data.

Contribution

It introduces a detailed analysis of tau decay considering anomalous dipole moments and derives experimental bounds on these moments.

Findings

Measured bounds on tau's anomalous magnetic dipole moment: κ = 0.16 ± 0.08.

Measured bounds on tau's electric dipole moment: |κ̃| = 0.88^{+0.25}_{-0.35}.

Analyzed decay rate modifications due to anomalous dipole interactions.

Abstract

We analyse the process $\tau^-\to\nu_\tau\pi^-\pi^0$ allowing for anomalous weak charged current magnetic and electric dipole moment interactions and determine the effects on the differential and total decay rates. Using recent experimental data we determine the following values for the anomalous magnetic and electric dipole moment parameters, respectively: $\kappa = 0.16 \pm 0.08; and |\tilde\kappa| = 0.88^{+0.25}_{-0.35}.$