Search for Lepton Flavor Violating tau^- Decays into l^-eta, l^-eta' and l^-pi^0
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We have searched for lepton flavor violating $τ$ decays with a pseudoscalar meson ($η$, $η'$ and $π^0$) 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: ${\cal{B}}(τ^-\to e^-η) < 9.2\times 10^{-8}$, ${\cal{B}}(τ^-\to μ^-η) < 6.5\times 10^{-8}$, ${\cal{B}}(τ^-\to e^-η') < 1.6\times 10^{-7}$, ${\cal{B}}(τ^-\to μ^-η') < 1.3\times 10^{-7}$ ${\cal{B}}(τ^-\to e^-π^0) < 8.0\times 10^{-8}$ and ${\cal{B}}(τ^-\to μ^-π^0) < 1.2\times 10^{-7}$ at the 90% confidence level, respectively. These results improve the previously published limits by factors from 2.3 to 6.4.
17 pages, 10 figures, submitted to the ICHEP06 Conference, Moscow, Russia
17 pages, 10 figures, submitted to the ICHEP06 Conference, Moscow, Russia