Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-05-09
Phys.Lett.B639:159-164,2006
Physics
High Energy Physics
High Energy Physics - Experiment
9 pages, 3figures, submitted to Phys.Lett. B
Scientific paper
10.1016/j.physletb.2006.05.086
We have searched for the lepton flavor violating decays $\tau^-\to \ell^-\ks$ ($\ell = e {or} \mu$), using a data sample of 281 fb$^{-1}$ collected with the Belle detector at the KEKB $e^+e^-$ asymmetric-energy collider. No evidence for a signal was found in either of the decay modes, and we set the following upper limits for the branching fractions: ${\cal{B}}(\tau^-\to e^-\ks) < 5.6\times 10^{-8}$ and ${\cal{B}}(\tau^-\to \mu^-\ks) < 4.9\times 10^{-8}$ at the 90% confidence level. These results improve the previously published limits set by the CLEO collaboration by factors of 16 and 19, respectively.
for the Belle Collaboration
Miyazaki Yasuhito
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