2023 Impact factor 4.2
Particles and Fields
Eur. Phys. J. C 32, 245-252 (2004)
DOI: 10.1140/epjc/s2003-01391-1

Lepton flavor violating Z-decays in supersymmetric seesaw model

J. Cao1, 2, Z. Xiong3 and J.M. Yang2, 4

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

(Received: 1 September 2003 / / Published online: 20 November 2003)

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.

© Società Italiana di Fisica, Springer-Verlag 2004