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

Research output: Contribution to journalJournal article


Journal publication date1995
JournalPhysics Letters B
Number of pages12
Original languageEnglish


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.