Eur. Phys. J. C 5, 229-237
An upper limit for the -neutrino mass from decays
The OPAL Collaboration
K.Ackerstaff - et al.
CERN, European Organisation for Particle Physics, CH-1211 Geneva 23, Switzerland
Received: 15 April 1998 / Published online: 12 August 1998
An upper limit for the -neutrino mass has been determined from the decay using data collected with the OPAL detector from 1991 to 1995 in collisions at . A limit of 43.2MeV at 95% CL is obtained using a two-dimensional method in the invariant mass and energy distribution from 22 selected events. Combining this result with OPAL's previously published measurement using decays, a new combined limit of MeV (95% CL) is obtained.