Search for tau -> e gamma decay at Belle

We have searched for the lepton-flavor-violating decay tau -> e gamma using a data sample of 86.7/fb collected with the Belle detector at the KEKB asymmetric e^+ e^- collider. No evidence for a signal is obtained, and we set an upper limit for the branching fraction Br(tau -> e gamma) < 3.9 x 10^-7 at the 90% C.L.Comment: 11 pages, 10 figures, ReVTeX4, eps

Search for lepton flavor violating decays tau- -> l- pi0, l- eta, l- eta'

We have searched for lepton flavor violating semileptonic tau decays using a data sample of 153.8/fb accumulated with the Belle detector at the KEKB e+e- collider. For the six decay modes studied, the observed yield is compatible with the estimated background and the following upper limits are set at the 90% confidence level: B(tau- -> e- eta) mu- eta) < 1.5 x 10^-7, B(tau- -> e- pi0) mu- pi0) < 4.1 x 10^-7, B(tau- -> e- eta') mu- eta') < 4.7 x 10^-7. These results are 10 to 64 times more restrictive than previous limits.Comment: 14 pages, 13 figures, RevTex