Towards a determination of the tau lepton dipole moments

TL;DR

This paper proposes a method to measure the tau lepton's magnetic and electric dipole moments with higher precision using data from high-luminosity B factories, aiming to improve current bounds.

Contribution

It introduces a novel approach to determine the tau lepton dipole moments with improved accuracy through analysis of specific tau decay channels.

Findings

Feasibility of measuring a_tau with O(10^-3) precision

Potential to improve existing limits on d_tau

Method applicable to high-luminosity B factory data

Abstract

The tau anomalous magnetic moment (a_tau) and electric dipole moment (d_tau) have not yet been observed. The present bounds on their values are of order 10^-2 and 10^-17 e*cm, respectively. We propose to measure a_tau with a precision of O(10^-3) or better and improve the existing limits on d_tau using precise tau- -> l- nu_tau \bar{nu}_l gamma (l=e or mu) data from high-luminosity B factories. A detailed feasibility study of this method is underway.