Observation of Bs to phi gamma and Search for Bs to gamma gamma Decays at Belle
Abstract
We search for the radiative penguin decays Bs to phi gamma and Bs to gamma gamma in a 23.6 fb-1 data sample collected at the Upsilon(5S) resonance with the Belle detector at the KEKB e+e- asymmetric-energy collider. We observe for the first time a radiative penguin decay of the Bs meson in the Bs to phi gamma mode. No significant Bs to gamma gamma signal is observed.
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