Limits on ${\nu }_{\tau }$ mass by DELPHI

Abstract

A limit on the tau neutrino mass is obtained using all the $Z^0\to {\tau }^{+}{\tau }^{-}$ data collected at LEP by the DELPHI detector between 1992 and 1995. In this analysis events in which one of the taus decays into one charged particle, while the second $\tau$ decays into f{}ive charged pions (1-5 topology) have been used. The neutrino mass is determined from a bidimensional \fit ~on the invariant mass $m_{5\pi }^{\ast }$ and on the energy $E_{5\pi }$ of the f{}ive ${\pi }^{\pm }$ system. The result found is $m_{{\nu }_{\tau }}<$ 48.0 MeV/$c^2$ at 95% conf{}idence level.

arXiv commentInvited talk at the 7th International Workshop on Tau Lepton Physics (TAU02), Santa Cruz, Ca, USA, Sept 2002, 9 pages, LaTex, espcrc2.sty, 9 eps figures

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