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

Hadronic b -> c decays at Belle

23 Jul 2010, 16:30
Salle 242A ()

Salle 242A

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


Mr Nikhil Jayant Joshi (Tata Institute of Fundamental Research, Mumbai)


We present a measurement of the unitarity triangle angle phi_3 using Dalitz plot analysis of three-body neutral D decays from the B^+ --> D^{(*)}K^{(*)+} process. The results are based on a large sample of B anti-{B} pairs recorded at the Upsilon(4S) resonance with the Belle detector at the KEKB e^+e^- collider. The decay B --> D^{(*)} K^{(*)} (D = D0 or anti-{D}0) includes the b --> u transition and plays a crucial role in the measurement of the CP-violating angle phi_3. We present the result of a study of the decay B --> D^{(*)} K^{(*)} where the D meson is reconstructed from K^+ \pi^-. We also report improved measurements of the branching fractions for the decays B0 --> D_s^{(*)+} \pi^- and anti-{B}0 --> D_s^{(*)+} K^-. Based on these results, we determine the ratio between the amplitudes of the doubly Cabibbo suppressed decay B0 --> D^{(*)+} pi^- and the Cabibbo favored decay B0 --> D^{(*)-} \pi^+. We studied the three-body baryonic B^+ decays, B^+ --> p \anti-Lambda D^{(*)0. The branching fractions as well as the differential branching fractions as a function of the mass of the p anti-Lambda system are presented. These results are compared with theoretical predictions based on the generalized factorization approach. We present a study of the exclusive decays B0 --> D_s^- K0_S pi^+ and B^- \to D_s^+ K^-K^-. We use the D_s^- --> phi pi^-, anti-{K}{}^{*}(892)0 K^- and K0_S K^- decay modes for D_s reconstruction.

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