New limits for neutrinoless tau decays

Creators: Bliss, D. W.; Chadha, M.; Chan, S.; Eigen, G.; Miller, J. S.; O'Grady, C.; Schmidtler, M.; Urheim, J.; Würthwein, F.; Weinstein, Alan J.; CLEO Collaboration

Abstract

Neutrinoless 3-prong tau lepton decays into a charged lepton and either two charged particles or one neutral meson have been searched for using 4.79fb^(-1) of data collected with the CLEO II detector at Cornell Electron Storage Ring. This analysis represents an update of a previous study and the addition of six decay channels. In all channels the numbers of events found are compatible with background estimates and branching fraction upper limits are set for 28 different decay modes. These limits are either more stringent than those set previously or represent the first attempt to find these decays.

Additional Information

© 1998 The American Physical Society. Received 8 December 1997; published in the issue dated 1 May 1998. We gratefully acknowledge the effort of the CESR staff in providing us with excellent luminosity and running conditions. J.P.A., J.R.P., and I.P.J.S. thank the NYI program of the NSF, M.S. thanks the PFF program of the NSF, G.E. thanks the Heisenberg Foundation, K.K.G., M.S., H.N.N., T.S., and H.Y. thank the OJI program of DOE, J.R.P., K.H., M.S. and V.S. thank the A. P. Sloan Foundation, R.W. thanks the Alexander von Humboldt Stiftung, M.S. thanks Research Corporation, and S.D. thanks the Swiss National Science Foundation for support. This work was supported by the National Science Foundation, the U.S. Department of Energy, and the Natural Sciences and Engineering Research Council of Canada.

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