Limits on the Mass of the Tau Neutrino from CLEO

Details Limits on the Mass of the Tau Neutrino from CLEO Limits on the Mass of the Tau Neutrino from CLEO

1998-11-02

arxiv.org/abs/hep-ex/9811002v1

Nucl.Phys.Proc.Suppl.76:403-408,1999

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 8 figures ; invited talk at the 5th International Workshop on Tau Lepton Physics (Tau'98), September 1998, Santander,

Scientific paper

10.1016/S0920-5632(99)00499-5

A limit on the mass of the tau neutrino is derived from 4.5x10^6 tau pairs produced at a center of mass energy of 10.6 GeV. The measurement technique involves a two-dimensional extended likelihood analysis, including the dependence of the end-point population on the tau neutrino mass, and allows for the first time an explicit background contribution. We use the decays of the tau to five charged pions and a neutrino and to 3 charged pions, 2 neutral pions and a neutrino to obtain an upper limit of 30 MeV, as well as a preliminary limit of 31 MeV from the decay of a tau to 3 charged hadrons, a neutral pi and a neutrino.

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