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An upper limit for the τ neutrino mass from τ → 5π(π0)ντ decays

Research output: Contribution to journalJournal article

Published

<mark>Journal publication date</mark>1995
<mark>Journal</mark>Physics Letters B
Issue4
Volume349
Number of pages12
Pages585-596
<mark>Original language</mark>English

Abstract

From a sample of 152,000 τ decays collected by the ALEPH detector at LEP an upper limit of 24 MeV at 95% CL on the τ neutrino mass has been determined. The limit is obtained using a two dimensional likelihood fit of the visible energy and the invariant mass distribution of 25 τ → 5π(π0)ντ events.