Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2002-05-16
Physics
High Energy Physics
High Energy Physics - Experiment
6pages, 9 figures; proceedings of the XXXVIIth Recontres de Moriond on Electroweak Interactions and Unified Theories, Les Arcs
Scientific paper
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 $\Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^+e^-$ storage ring. The $b \to s \gamma$ transition was studied through exclusive decays: $B \to K^{*} \gamma$, $B^0 \to K_{2}^{*}(1430)^0 \gamma$, $B^+ \to K^+\pi^-\pi^- \gamma$, $B^+ \to K^{*0} \pi^+ \gamma$ and $B^+ \to K^+\rho^0 \gamma$. The $b \to s \ell^+ \ell^-$ transition was searched through both exclusive decays, $B \to K^{(*)} \ell^+ \ell^-$, 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.
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