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Improved Measurements of Branching Fractions for B->Kpi, pipi and KK Decays

The Belle Collaboration·Y. Chao·K. Suzuki·Y. Unno
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Abstract

We report improved measurements of branching fractions for $B\to Kπ$, $π^+π^-$, $π^+π^0$ and $K\bar{K}$ decays based on a data sample of 85.0 million $B\bar{B}$ pairs collected at the $Υ(4S)$ 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 $B\to Kπ$, $π^+π^-$ and $π^+π^0$ 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 $ϕ_3$, as well as limits on the hadronic uncertainty in the time-dependent analysis of the angle $ϕ_2$.

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The Belle Collaboration, Y. Chao, K. Suzuki, Y. Unno. 2004-03-14. Improved Measurements of Branching Fractions for B->Kpi, pipi and KK Decays. https://doi.org/10.1103/physrevd.69.111102

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