Determination of an upper limit for the mass of the τ-neutrino at LEP

The OPAL Collaboration

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


An upper limit for the ντ mass is determined through the kinematic reconstruction of the decay τ→5 π±ντ in the OPAL detector at LEP. The limit is obtained using a new method based on the comparison of the two-dimensional distribution of energy and invariant mass of the five-pion system with expectations from different neutrino mass hypotheses. From a sample of five events surviving the selection criteria we obtain an upper limit of 74 MeV at 95% confidence level. It is the first measurement at LEP energies, where the larger average multiplicity of {Mathematical expression} events makes the suppression of this background more robust compared to lower energies.

Original languageEnglish
Pages (from-to)183-188
Number of pages6
JournalEuropean Physical Journal C
Issue number2
StatePublished - 1 Jun 1995
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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