Constraints on the tau neutrino mass and mixing from precise measurements of tau decay rates

Details Constraints on the tau neutrino mass and mixing from precise measurements of tau decay rates Constraints on the tau neutrino mass and mixing from precise measurements of tau decay rates

1996-10-04

arxiv.org/abs/hep-ph/9610242v1

Phys.Rev.D55:1-4,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 2 figures

Scientific paper

10.1103/PhysRevD.55.1

We have derived constraints on the tau neutrino mass and fourth generation mixing from an analysis of the partial widths of tau lepton decays, in particular: tau -> e nu nu_tau, tau -> mu nu nu_tau, tau -> pi nu_tau, tau -> K nu_tau. We present predictions for the tau decay widths, allowing for a non-zero tau neutrino mass, m(nu_tau), and for mixing with a neutrino of mass m(nu_L) > M_Z/2, which is parametrised using a Cabibbo-like mixing angle, theta_L. By comparison of these theoretical predictions with the experimental measurements, we obtain the following bounds at the 90% confidence level: m(nu_tau) < 42 MeV and sin^2(theta_L) < 0.014.

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