Search for Lepton and Baryon Number Violating τ− Decays into p¯γ, p¯π0, Λ¯π−, and Λπ−

We have searched for decays that violate both lepton and baryon number using data collected by the Belle detector at the KEKB asymmetric e+e− collider. No signals are found in τ−→p¯γ, τ−→p¯π0, τ−→Λ¯π−, and τ−→Λπ− and we set upper limits on the branching fractions of B(τ−→p¯γ)<3.0×10−7, B(τ−→p¯π0)<6.5×10−7, B(τ−→Λ¯π−)<1.3×10−7, and B(τ−→Λπ−)<0.70×10−7 at the 90% confidence level.