Abstract
We report searches for the radiative penguin decays Bs0 → ϕγ and Bs0 → γγ based on a 23.6 fb-1 data sample collected with the Belle detector at the KEKB e+e− energy-asymmetric collider operating at the γ(5S) resonance. We obtain the first observation of a radiative penguin decay of the Bs0 meson in the Bs0 → ϕγ mode and we measure ß(Bs0-+ ϕγ) = (57-15+18 (stat) -17+12 (syst)) × 10-6. No significant Bs0 → γγ signal is observed and we set an upper limit at 90% confidence level of ß(Bs0 → γγ) < 8.6 × 10-6. These results are preliminary.
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