Measurement of the branching ratio of B¯0→D∗+τ−ν¯τ relative to B¯0→D∗+ℓ−ν¯ℓdecays with a semileptonic tagging method

Abstract

We report a measurement of the ratio between B¯0→D∗+τ−ν¯τ relative to B¯0→D∗+ℓ−ν¯ℓdecays with a semileptonic tagging method. The results are based on a data sample containing 772 × 106 BB¯ pairsrecorded at the ϒ(4S) resonance with the Belle detector at the KEKB e+e- collider.