EPJ

2023 Impact factor 4.2
EPJ C - Particles and Fields
Particles and Fields
Eur. Phys. J. C 2, 395-406
DOI 10.1007/s100529800850

An upper limit on the $\tau$ neutrino mass from three- and five-prong tau decays

ALEPH Collaboration, R.Barate et al.

Laboratoire de Physique des Particules (LAPP), IN2P3-CNRS, F-74019 Annecy-le-Vieux Cedex, France

Received: 30 October 1997 / Published online: 10 March 1998

Abstract
A bound on the tau neutrino mass is established using the data collected from 1991 to 1995 at $\sqrt{s} \simeq m_{Z}$with the ALEPH detector. Two separate limits are derived by fitting the distribution of visible energy vs invariant mass in $\tau^{-} \rightarrow 2\pi^{-} \pi^{+} \nu_{\tau}$ and $\tau^{-} \rightarrow 3\pi^{-} 2\pi^{+} (\pi^{0}) \nu_{\tau }$ decays. The two results are combined to obtain a $95\%$ confidence level upper limit of $18.2 {\mathrm MeV}/c^{2}$on the mass of the tau neutrino.

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