Lepton flavor violating $Z$-decays in supersymmetric seesaw model

J. Cao; Z. Xiong; J.M. Yang

doi:doi:10.1140/epjc/s2003-01391-1

EPJ

a
b
c
d
e
ap
st
h
plus
ds
pv
ti
qt
am
n

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. Cao^{1, 2}, Z. Xiong³ and J.M. Yang^{2, 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)

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.