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

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<mark>Journal publication date</mark>04/1998
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number3
Volume2
Number of pages12
Pages (from-to)395-406
Publication StatusPublished
<mark>Original language</mark>English

Abstract

A bound on the tau neutrino mass is established using the data collected from 1991 to 1995 at s√≃mZ with the ALEPH detector. Two separate limits are derived by fitting the distribution of visible energy vs invariant mass in τ−→2π−π+ντ and τ−→3π−2π+(π0)ντ decays. The two results are combined to obtain a 95% confidence level upper limit of 18.2 MeV/c 2 on the mass of the tau neutrino.