Penguin-mediated B Decays at Belle

Abstract

We report on the results of penguin-mediated B decays at the Belle experiment. The analyses were based on approximately 32 million $B\bar{B}$ events collected at the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB $e^{+}{e}^{-}$ storage ring. The $b\to s\gamma$ transition was studied through exclusive decays: $B\to K^{\ast }\gamma$, $B^0\to K_2^{\ast }(1430{)}^0\gamma$, $B^{+}\to K^{+}{\pi }^{-}{\pi }^{-}\gamma$, $B^{+}\to K^{\ast 0}{\pi }^{+}\gamma$ and $B^{+}\to K^{+}{\rho }^0\gamma$. The $b\to s{\ell }^{+}{\ell }^{-}$ transition was searched through both exclusive decays, $B\to K^{(\ast )}{\ell }^{+}{\ell }^{-}$, and inclusive decay, $B\to X_s{\ell }^{+}{\ell }^{-}$. We observed the decay processes $B^{+}\to K^{+}{\pi }^{+}{\pi }^{-}\gamma$ and $B\to K{\ell }^{+}{\ell }^{-}$ for the first time.

6pages, 9 figures; proceedings of the XXXVIIth Recontres 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