Vector-meson magnetic dipole moment effects in radiative tau decays

TL;DR

This paper investigates how the magnetic dipole moment of light charged vector mesons influences radiative tau decays, proposing that photon emission patterns can reveal this property with minimal background interference.

Contribution

It introduces a method to measure the magnetic dipole moment of vector mesons through specific tau decay channels and analyzes the sensitivity of photon emission spectra to this property.

Findings

Photon energy spectrum and angular distribution are sensitive to the magnetic dipole moment.

Model-dependent effects and other electromagnetic multipoles are negligible at small angles.

Magnetic dipole moment impacts integrated decay rates and photon spectra.

Abstract

We study the possibility that the magnetic dipole moment of light charged vector mesons could be measured from their effects in \tau^- --> V^-\nu_{\tau}\gamma decays. We conclude that the energy spectrum and angular distribution of photons emitted at small angles with respect to vector mesons is sensitive the effects of the magnetic dipole moment. Model-dependent contributions and photon radiation off other electromagnetic multipoles are small in this region. We also compute the effects of the magnetic dipole moment on the integrated rates and photon energy spectrum of these $\tau$ lepton decays.