Measurement of the branching fraction of B<sup>+</sup> → τ<sup>+</sup>ν<inf>τ</inf> decays with the semileptonic tagging method and the full Belle data sample

Date Issued
01-01-2014
Author(s)
Abdesselam, A.
Adachi, I.
Adamczyk, K.
Aihara, H.
Al Said, S.
Arinstein, K.
Arita, Y.
Asner, D. M.
Aso, T.
Aulchenko, V.
Aushev, T.
Ayad, R.
Aziz, T.
Bahinipati, S.
Bakich, A. M.
Bala, A.
Ban, Y.
Bansal, V.
Barberio, E.
Barrett, M.
Bartel, W.
Bay, A.
Bedny, I.
Behera, P.
Belhorn, M.
Belous, K.
Bhardwaj, V.
Bhuyan, B.
Bischofberger, M.
Blyth, S.
Bobrov, A.
Bondar, A.
Bonvicini, G.
Bookwalter, C.
Boulahouache, C.
Bozek, A.
BraÄ ko, M.
Brodzicka, J.
Brovchenko, O.
Browder, T. E.
ÄŒervenkov, D.
Chang, M. C.
Chang, P.
Chao, Y.
Chekelian, V.
Chen, A.
Chen, K. F.
Chen, P.
Cheon, B. G.
Chilikin, K.
Chistov, R.
Cho, K.
Chobanova, V.
Choi, S. K.
Choi, Y.
Cinabro, D.
Crnkovic, J.
Dalseno, J.
Danilov, M.
Dingfelder, J.
Doležal, Z.
Drásal, Z.
Drutskoy, A.
Dutta, D.
Dutta, K.
Eidelman, S.
Epifanov, D.
Esen, S.
Farhat, H.
Fast, J. E.
Feindt, M.
Ferber, T.
Frey, A.
Frost, O.
Fujikawa, M.
Gaur, V.
Gabyshev, N.
Ganguly, S.
Garmash, A.
Gillard, R.
Giordano, F.
Glattauer, R.
Goh, Y. M.
Golob, B.
Grosse Perdekamp, M.
Grzymkowska, O.
Guo, H.
Haba, J.
Hamer, P.
Han, Y. L.
Hara, K.
Hara, T.
Hasegawa, Y.
Hasenbusch, J.
Hayasaka, K.
Hayashii, H.
He, X. H.
Heck, M.
Heffernan, D.
Heider, M.
Abstract
We report a measurement of the branching fraction of B+ → τ+ντ decays using a data sample of 772 × 106BB pairs, collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We reconstruct the accompanying B meson in a semileptonic decay and detect the B+ → τ+ντ candidate in the recoiling event. We obtain a branching fraction of B(B+ → τ+ντ) = [1.25 ± 0.28(stat.) ± 0.27(syst.)] × 10−4. This result is in good agreement with previous measurements and the expectation from calculations based on the Standard Model.