Search for neutrinoless decays τ→ℓhh

We have searched for neutrinoless τ lepton decays into one electron or niuon and two charged pion or kaon using a 158 fb−1 data sample collected with the Belle detector at the KEKB e+e− collider. Since the number of signal candidate events is compatible with the expected background, we set 90% confidence level upper limits on the branching fractions in the range (2.2 −15.5) × 10−7 for various decay modes τ→ℓhh where ℓ and h represent e or μ and π± or K±, respectively.