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Search for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mi mathvariant="bold-italic">B</mml:mi><mml:mi mathvariant="bold-italic">s</mml:mi><mml:mn mathvariant="bold-italic">0</mml:mn></mml:msubsup><mml:mo stretchy="false">→</mml:mo><mml:mi mathvariant="bold-italic">γ</mml:mi><mml:mi mathvariant="bold-italic">γ</mml:mi></mml:mrow></mml:math>and a measurement of the branching fraction for<mml:math xmlns:mml="http://www.w3.org/1998/Math/…
We search for the decay B0s→γγ and measure the branching fraction for B0s→ϕγ using 121.4 fb−1 of data collected at the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The B0s→ϕγ branching fraction is measured to be (3.6±0.5(stat)±0.3(syst)±0.6(fs))×10−5, where fs is the fraction of B(*)s¯B(*)s in …