Abstract
A limit on the tau neutrino mass is obtained using all the Z 0 → τ + τ − 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 τ decays into five charged pions (1–5 topology) have been used. The neutrino mass is determined from a bidimensional fit on the invariant mass m 5π ∗ and on the energy E 5 π of the five π ± system. The result found is m ν τ < 48.0 MeV/c 2 at 95% confidence level.
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