22-28 July 2010
Palais des Congrès de Paris
Europe/Paris timezone

B-> tau nu & B->D(*)tau nu decays at Belle

23 Jul 2010, 11:28
Salle 242A ()

Salle 242A

Parallel Session Talk 06 - CP violation, CKM and Rare Decays 06 - CP violation, CKM and Rare Decays


Jacek Stypuła (H. Niewodniczański Institute of Nuclear Physics Kraków)


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.

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