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Search for the radiative penguin decays $$B^{0} to K_S^{0}K_S^{0}$$$$gamma$$ in the Belle experiment

Jeon, H. B.*; 谷田 聖   ; Belle Collaboration*; 他219名*

Jeon, H. B.*; Tanida, Kiyoshi; Belle Collaboration*; 219 of others*

We report the first search for the penguin-dominated process $$B^0 rightarrow K_S^0 K_S^0 gamma$$ using the full data sample of $$772times 10^6$$ $$Bbar{B}$$ pairs collected with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider. We do not observe any statistically significant signal yield in the $$K_S^0$$-pair invariant mass range 1 GeV/$$c^2 < M_{K_S^0 K_S^0} < $$ 3 GeV/$$c^2$$, and set the following upper limits at 90% confidence level: $$mathcal{B}(B^0 to K_S^0 K_S^0 gamma) < 5.8times10^{-7}$$, $$mathcal{B}(B^0 to f_2 gamma)times mathcal{B}(f_2 (1270) to K_S^0 K_S^0 ) < 3.1times10^{-7}$$, and $$mathcal{B}(B^0 to f_2^{prime} gamma)times mathcal{B}(f_2^{prime} (1525) to K_S^0 K_S^0 ) < 2.1times10^{-7}$$. Further, 90% confidence upper limits have also been set in the range of [0.7-2.9]$$times10^{-7}$$ on the $$B^0 rightarrow K_S^0 K_S^0 gamma$$ branching fraction in bins of $$M_{K_S^0 K_S^0}$$.

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分野:Astronomy & Astrophysics

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