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Lepton flavor violating <Emphasis Type="Italic">Z</Emphasis>-decays in supersymmetric seesaw model

Authors:	J Cao Z Xiong J M Yang

Institution:	(1) CCAST (World Laboratory), P.O. Box 8730, 100080 Beijing, P.R. China;(2) Institute of Theoretical Physics, Academia Sinica, 100080 Beijing , P.R. China;(3) Graduate School of Science, Hiroshima University, 937-6256 Hiroshima, Japan;(4) Department of Physics, Tohoku University, 980-8578 Sendai, Aoba-ku, Japan

Abstract:	In the supersymmetric seesaw model, large flavor mixings of sleptons induce the lepton flavor violating (LFV) interactions $\ell_I \bar\ell_J V$ ( $V = \gamma, Z$ ), which give rise to various LFV processes. In this work we examine the LFV decays $Z\to\ell_I \bar\ell_J$ . Subject to the constraints from the existing neutrino oscillation data and the experimental bounds on the decays $\ell_J\to\ell_I\gamma$ , these LFV Z-decays are found to be sizable, and among them the largest-rate channel $Z\to \tau \bar{\mu}$ can occur with a branching ratio of 10^-8 and may be accessible at the LHC or GigaZ experiment.Received: 1 September 2003, Published online: 20 November 2003

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