# ICHEP2012

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

## Hadronic B decays at Belle

Jul 7, 2012, 11:45 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

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))

 Slides