Search for Lepton Flavor Violating tau^- Decays into \ell^-η, \ell^-η' and \ell^-π^0

Details Search for Lepton Flavor Violating tau^- Decays into \ell^-η, \ell^-η' and \ell^-π^0 Search for Lepton Flavor Violating tau^- Decays into \ell^-η, \ell^-η' and \ell^-π^0

2007-03-04

arxiv.org/abs/hep-ex/0703009v1

Phys.Lett.B648:341-350,2007

Physics

High Energy Physics

High Energy Physics - Experiment

16 pages, 15 figures, submitted to Phys.Lett. B

Scientific paper

10.1016/j.physletb.2007.03.027

We have searched for lepton-flavor-violating $\tau$ decays with a pseudoscalar meson ($\eta$, $\eta'$ {and} $\pi^0$) using a data sample of 401 fb$^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. No evidence for these decays is found and we set the following upper limits on the branching fractions: ${\cal{B}}(\tau^-\to e^-\eta) < 9.2\times 10^{-8}$, ${\cal{B}}(\tau^-\to \mu^-\eta) < 6.5\times 10^{-8}$, ${\cal{B}}(\tau^-\to e^-\eta') < 1.6\times 10^{-7}$, ${\cal{B}}(\tau^-\to \mu^-\eta') < 1.3\times 10^{-7}$, ${\cal{B}}(\tau^-\to e^-\pi^0) < 8.0\times 10^{-8}$ and ${\cal{B}}(\tau^-\to \mu^-\pi^0) < 1.2\times 10^{-7}$ at the 90% confidence level. These results improve our previously published upper limits by factors from 2.3 to 6.3.

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