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

Hadronic B decays at Belle

7 Jul 2012, 11:45
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 Room 220 Lattice QCD / B-Physics / CP Violation, etc -TR5&7&10

Speaker

Ms T'Mir Julius (University of Melbourne (AU))

Description

The measurement of $B^0 \to \pi^0 \pi^0$ plays a vital role in the extraction of the UT angle $\phi_2 = arg[-V_{td} V_{tb}^*/V_{ud} V_{ub}^* ]$ from time-dependent CP analyses of the $B\to \pi\pi$ decays. This process is also expected to exhibit direct CP violation, a measurement of which would place additional constraints on $\phi_2$. Furthermore, an improved analysis of $B^0 \to \pi^0 \pi^0$ would help resolve the significant disagreement in the Belle and BaBar measurements of this mode. We present a new measurement of this mode using the full data set of $772 \times 10^6$ $B\bar{B}$ pairs collected by the Belle experiment at the KEKB asymmetric-energy $e^+ e^−$ collider. We present improved measurements of the branching fraction, $CP$ asymmetry and longitudinal polarization fraction for the $B^+ \to \rho^+ \rho^0$ decay based on a data sample corresponding to $772 \times 10^6$ $B\bar{B}$ pairs, collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^−$ collider. We report the results of a search for the $B^+ \to K^{*+} \overline{K}{}^{*0}$ decay based on a data sample of $772 \times 10^6$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^−$ collider. Decays of $B$ mesons to the final states with an even number of kaons, such as $B^0 \to K^+ K^- \pi^0$, are suppressed within the Standard Model (SM). Therefore, they provide a unique probe to test the SM predictions. We present a first search of this decay using the full data set of $772 \times 10^6$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^−$ collider. We search for $B\to K^+ K^-$ decay based on the fulll data sample of $772 \times 10^6$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^−$ collider.

Primary author

Ms T'Mir Julius (University of Melbourne (AU))

Presentation materials