Search for $B^0\to K_S^0{K}_S^0\gamma$ decays at Belle

Abstract

We report the first search for the penguin-dominated process $B^0\to K_S^0{K}_S^0\gamma$ using the full data sample of $772\times 10^6$ $B\bar{B}$ 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: $\mathcal{B}(B^0\to K_S^0{K}_S^0\gamma )<5.8\times 10^{-7}$, $\mathcal{B}(B^0\to f_2\gamma )\times \mathcal{B}(f_2(1270)\to K_S^0{K}_S^0)<3.1\times 10^{-7}$, and $\mathcal{B}(B^0\to f_2^{\prime }\gamma )\times \mathcal{B}(f_2^{\prime }(1525)\to K_S^0{K}_S^0)<2.1\times 10^{-7}$. Further, 90% confidence upper limits have also been set in the range of [0.7-2.9]$\times 10^{-7}$ on the $B^0\to K_S^0{K}_S^0\gamma$ branching fraction in bins of $M_{K_S^0{K}_S^0}$.

To be submitted to Physical Review D

References in corpus (5)

• Updated NNLO QCD predictions for the weak radiative B-meson decays
• Radiative and Electroweak Penguin Decays of B Mesons
• Measurement of the $\bar{B}\to X_s\gamma$ Branching Fraction with a Sum of Exclusive Decays
• Measurement of the ratio of branching fractions BR(B0 -> K*0 gamma)/BR(Bs0 -> phi gamma) and the direct CP asymmetry in B0 -> K*0 gamma
• Evidence for Isospin Violation and Measurement of $CP$ Asymmetries in $B\to K^{\ast }(892)\gamma$