Search for the Lepton Flavor Violating Decays <i>B</i><SUP>+</SUP> → <i>K</i><SUP>+</SUP> τ<SUP>±</SUP> <i>l</i><SUP>∓</SUP> (<i>l</i> = <i>e</i>, μ) at Belle

Abstract

We present a search for the lepton flavor violating decays B+→K+τ±ℓ∓, with ℓ=(e,μ), using the full data sample of 772×106 BB¯ pairs recorded by the Belle detector at the KEKB asymmetric-energy e+e- collider. We use events in which one B meson is fully reconstructed in a hadronic decay mode. We find no evidence for B±→K±τℓ decays and set upper limits on their branching fractions at the 90% confidence level in the (1-3)×10-5 range. The obtained limits are the world's best results.