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K. Ackerstaff et al. | Zendy

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An upper limit for the

Author(s) -

K. Ackerstaff et al.

Publication year - 1998

Publication title -

the european physical journal c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.938

H-Index - 198

eISSN - 1434-6052

pISSN - 1434-6044

DOI - 10.1007/s100520050264

Subject(s) - physics , limit (mathematics) , neutrino , particle physics , invariant mass , bar (unit) , tau neutrino , nuclear physics , neutrino oscillation , mathematics , mathematical analysis , meteorology

An upper limit for the tau-neutrino mass has been determined from the decaytau -> 5pi+- \nu_tau using data collected with the OPAL detector from 1991 to1995 in e+e- collisions at \sqrt{s} ~ M_Z. A limit of 43.2 MeV at 95% CL isobtained using a two-dimensional method in the 5pi invariant mass and energydistribution from 22 selected events. Combining this result with OPAL'spreviously published measurement using tau+tau- -> 3h+- \bar{nu}_tau 3h-+\nu_tau decays, a new combined limit of m_{nu_tau} < 27.6 MeV (95% CL) isobtained.Comment: 17 pages, LaTeX, 4 eps figures included, submitted to Eur. Phys.

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