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

Abstract

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 ${\rm Y}(4S)$ 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 ${\varphi }_3$, as well as limits on the hadronic uncertainty in the time-dependent analysis of the angle ${\varphi }_2$.

10 pages, 1 figure, 4 tables. Submitted to Phys. Rev. D Rapid Communications. Several corrections were made

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