Bestimmung einer oberen Grenze fur die Masse des tau-Neutrinos mit dem OPAL-Detektor

An upper limit for the tau -neutrino mass has been determined from the decay tau to 5 pi /sup +or-/ nu /sub tau / using data collected with the OPAL detector from 1991 to 1995 in e/sup +/e/sup -/ collisions at square root (s) $9 approximately=M/sub Z0/. A limit of 43.2 MeV at 95Ø.000554330žL is obta...

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Detalles Bibliográficos
Autor principal: Scharf, F
Lenguaje:ger
Publicado: Bonn Univ. 1998
Materias:
Particle Physics - Experiment
Acceso en línea:http://cds.cern.ch/record/409787
Descripción
Sumario:An upper limit for the tau -neutrino mass has been determined from the decay tau to 5 pi /sup +or-/ nu /sub tau / using data collected with the OPAL detector from 1991 to 1995 in e/sup +/e/sup -/ collisions at square root (s) $9 approximately=M/sub Z0/. A limit of 43.2 MeV at 95Ø.000554330žL is obtained using a two-dimensional method in the 5 pi invariant mass and energy distribution from 22 selected events. Combining this result with OPAL's previously $9 published measurement using tau /sup +/ tau /sup -/ to 3h/sup +or-/v/sub tau /+3h/sup -or+/ nu tau decays, a new combined limit of m/sub nu tau / <27.6 MeV (95 CL) is obtained. (74 refs).

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