New constraints on the tau neutrino mass and fourth generation mixing

Details New constraints on the tau neutrino mass and fourth generation mixing New constraints on the tau neutrino mass and fourth generation mixing

1997-12-15

arxiv.org/abs/hep-ph/9712383v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

2 pages, no figures. Submitted to Phys. Rev. D

Scientific paper

We present new constraints on the mass $m_{\nu_\tau}$ of the tau neutrino and its mixing with a fourth generation neutrino. From an analysis of the partial widths of tau lepton decays we obtain the following bounds at the 90% confidence level: $m_{\nu_\tau} < 32$ MeV and $\sin^2\theta < 0.007$, where $\theta$ describes the Cabibbo-like mixing of the third and fourth generation neutrinos.

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