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Author: Jon Urheim (Caltech, representing the CLEO Collaboration)

Title: New Limits on Tau Neutrino Mass from CLEO II

Abstract: I report on two studies of tau neutrino mass recently carried out using data collected with the CLEO II detector at the CESR e+e- collider. First I present the results of an analysis of 473 decays of the type tau- --> nu_tau 3pi- 2pi+ and tau- --> nu_tau 2pi- pi+ 2pi0, from which a 95% CL upper limit on m_{nu_tau} of 30 MeV is obtained. Results are also presented from a preliminary analysis of the decay tau- --> nu_tau 2pi- pi+ pi0, using a sample of 29,000 reconstructed events. In addition, I report on a study of hadronic structure in tau- --> nu_tau pi- 2pi0, and discuss the implications for neutrino mass analyses based on the nu_tau 3pi decay channel. Prospects for improved constraints on m_{nu_tau} in the near future are examined.

Comments: 8 pages, Latex, figures in 9 encapsulated postscript filesReport-no: DPF '99 Talk # 2-02


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DPF99