Bounds on the dipole moments of the tau-neutrino via the process $e^{+}e^{-}\rightarrow \nu \bar \nu \gamma$ in a 331 model

TL;DR

This paper derives bounds on the tau-neutrino's dipole moments using LEP data within a 331 model, considering initial-state radiation and neglecting certain diagrams, providing competitive limits compared to other models.

Contribution

It introduces new limits on tau-neutrino dipole moments within a 331 model framework using LEP data, considering specific reaction mechanisms.

Findings

Limits on tau-neutrino magnetic dipole moment

Limits on tau-neutrino electric dipole moment

Comparison with other model limits

Abstract

We obtain limits on the anomalous magnetic and electric dipole moments of the $\nu_{\tau}$ through the reaction $e^{+}e^{-}\rightarrow \nu \bar \nu \gamma$ and in the framework of a 331 model. We consider initial-state radiation, and neglect $W$ and photon exchange diagrams. The results are based on the data reported by the L3 Collaboration at LEP, and compare favorably with the limits obtained in other models, complementing previous studies on the dipole moments.