Rare B Decays at Belle

Abstract

Recent results of rare B decay analyses based on 31.9 million $B\bar{B}$ collected with the Belle detector at the KEKB asymmetric $e^{+}{e}^{-}$ collider are presented. We have made the first observation of charmless baryonic decay $B^{\pm }\to p\bar{p}{K}^{\pm }$, the three-body $B^0\to K^0{\pi }^{+}{\pi }^{-}$ and $B^0\to K^0{K}^{+}{K}^{-}$. The measured branching fractions are $\mathcal{B}(B^{+}\to p\bar{p}{K}^{+})=(4.3_{-0.9}^{+1.1}\pm 0.5)\times 10^{-6}$, $\mathcal{B}(B^0{\to}K^0π^+π^-) = (\brkspp) \times 10^{-6}$, and ${\mathcal{B}}(B^0{\to}K^0 K^+ K^-) = (\brkskk) \times 10^{-6}$. We also see strong evidence of $B^{\pm }\to \eta K^{\pm }$ and $B^{\pm }\to \eta {\pi }^{\pm }$, and observed the decay $B^{\pm }\to \omega K^{\pm }$ with $\mathcal{B}(B^{\pm }\to \omega K^{\pm })=(9.9_{-2.4}^{+2.7}\pm 1.0)\times 10^{-6}$. Preliminary results of improved measurements of the branching fractions for the decays $B\to K\pi$ and $\pi \pi$ are reported. No evidence for direct CP violation is found in the decays $B^{\pm }\to K^{\pm }{\pi }^{\mp }$, $K^{\pm }{\pi }^0$, $K^0{\pi }^{\pm }$, ${\pi }^{\pm }{\pi }^0$, and $\omega K^{\pm }$.

8 pages, 6 figures, proceedings of the XXXVII Rencontres de Moriond on Electroweak Interactions and Unified Theories, Les Arcs, France, 9-16 March 2002

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• XXXVIIiéme Rencontres de Moriond: Electroweak 2002 Conference Summary