# ICHEP2012

Jul 4 – 11, 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

## Leptonic and semileptonic B decays at Belle

Jul 5, 2012, 10:00 AM
15m
Room 220 (Melbourne Convention and Exhibition Centre)

### Room 220

#### Melbourne Convention and Exhibition Centre

Melbourne Australia
Parallel Sessions Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy

### Speaker

Mr Youngmin Yook (Yonsei University)

### Description

We present a measurement of the decay $B\to\tau\nu$ using the full Belle data set including $772 \times 10^6$ $B\bar{B}$ collected at the KEKB asymmetric-energy $e^+e^-$ collider. The $B\bar B$ pair events are tagged by fully reconstructing one B meson decaying in a hadronic mode and detecting the $B\to\tau\nu$ candidate in the recoil. We obtain the branching fraction for $B\to\tau\nu$ 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 the charged Higgs boson are also discussed.

### Primary author

Mr Youngmin Yook (Yonsei University)

 Slides