Limits on $ν_τ$ mass by DELPHI

Details Limits on $ν_τ$ mass by DELPHI Limits on $ν_τ$ mass by DELPHI

2002-09-25

arxiv.org/abs/hep-ex/0209067v1

eConf C0209101 (2002) TH01

Physics

High Energy Physics

High Energy Physics - Experiment

Invited talk at the 7th International Workshop on Tau Lepton Physics (TAU02), Santa Cruz, Ca, USA, Sept 2002, 9 pages, LaTex,

Scientific paper

10.1016/S0920-5632(03)02185-6

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 $m^{*}_{5 \pi}$ and on the energy $E_{5 \pi}$ of the f{}ive $\pi^{\pm}$ system. The result found is $m_{\nu_{\tau}}<$ 48.0 MeV$\slash c^{2}$ at 95% conf{}idence level.

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