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We report a measurement of the branching fraction of $B^+ \to \tau^+\nu_\tau$ decays using a data sample of $772 \times 10^6 B \bar{B}$ pairs,collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKBasymmetric-energy $e^+e^-$ collider. We reconstruct the accompanying $B$ mesonin a semileptonic decay and detect the $B^+ \to \tau^+ \nu_\tau$ candidate inthe recoiling event. We obtain a branching fraction of ${\cal B}(B^+ \to \tau^+\nu_\tau) = [1.25 \pm 0.28 ({\rm stat.}) \pm 0.27({\rm syst.})] \times10^{-4}$. This result is in good agreement with previous measurements and theexpectation from calculations based on the Standard Model.

Measurement of the branching fraction of $B^+ \to \tau^+ \nu_\tau$ decays with the semileptonic tagging method and the full Belle data sample