Limit on Tau Neutrino Mass from $\tau^{-}\to \pi^{-}\pi^{+}\pi^{-}\pi^{0}\nu_{\tau}$

TL;DR

Using data from tau decays observed in the CLEO detector, the study establishes an upper limit of 28 MeV on the tau neutrino mass with 95% confidence, contributing to particle physics constraints.

Contribution

The paper provides a new upper limit on the tau neutrino mass based on experimental data, improving existing bounds.

Findings

Tau neutrino mass limit of 28 MeV at 95% confidence

Analysis of 29058 tau decay events

First limit derived from this specific decay channel

Abstract

From a data sample of 29058 $\tau^\pm\to\pi^\pm\pi^+\pi^-\pi^0\nu_\tau$ decays observed in the CLEO detector we derive a 95% confidence upper limit on the tau neutrino mass of 28 MeV.