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

Abstract

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
Volume65
Issue number2
DOIs
StatePublished - 1 Jun 1995
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Fingerprint

Dive into the research topics of 'Determination of an upper limit for the mass of the τ-neutrino at LEP'. Together they form a unique fingerprint.

Cite this