Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2003-11-28
Phys.Rev.D69:111102,2004
Physics
High Energy Physics
High Energy Physics - Experiment
10 pages, 1 figure, 4 tables. Submitted to Phys. Rev. D Rapid Communications. Several corrections were made
Scientific paper
10.1103/PhysRevD.69.111102
We report improved measurements of branching fractions for $B\to K\pi$, $\pi^+\pi^-$, $\pi^+\pi^0$ and $K\bar{K}$ decays based on a data sample of 85.0 million $B\bar{B}$ pairs collected at the $\Upsilon (4S)$ resonance with the Belle detector at the KEKB $e^+e^-$ storage ring. This data sample is almost three times larger than the sample previously used. We observe clear signals for $B\to K\pi$, $\pi^+\pi^-$ and $\pi^+\pi^0$ decays and set upper limits on $B\to K\bar{K}$ decays. The results can be used to give model-dependent constraints on the CKM angle $\phi_3$, as well as limits on the hadronic uncertainty in the time-dependent analysis of the angle $\phi_2$.
Chao Yuan
Suzuki Kaori
The Belle Collaboration
Unno Yoshinobu
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