Speaker
Jacek Stypuła
(H. Niewodniczański Institute of Nuclear Physics Kraków)
Description
We present a measurement of the decay B --> tau nu in a large data sample recorded with the Belle detector at the KEKB asymmetric energy e^+ e^- collider. We obtain the branching fraction for B --> tau nu and present a direct determination of the product of the B meson decay constant f_B and the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |V_{ub}|. The resulting constraints on a charged Higgs boson are also discussed. We also present studies of B^+ --> \bar{D}^{*0} tau^+ nu and B^+ --> \bar{D}0 tau^+ nu decays. The events are tagged by inclusively reconstructing the accompanying B meson. Measurements of branching fractions and distributions characterizing signal decays are presented.
Primary author
Collaboration BELLE
(KEK)
