Search for Lepton Flavor Violating tau Decays into Three Leptons

Understand

We search for lepton-flavor-violating tau decays into three leptons (electron or muon) using 535 fb^{-1} of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider.

• No evidence for these decays is observed and we set 90% confidence level upper limits on the branching fractions between 2.0x10^{-8} and 4.1x10^{-8}.
• These results improve the best previously published upper limits by factors from 4.9 to 7.0.