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  • Search for $B^{0} \to K_S^{0}K_S^{0}\gamma$ decays at Belle
    Belle Collaboration; Kang, K. H; Said, S. Al; Asner, D. M; Aushev, T; Ayad, R; Babu, V; Bernlochner, F; Bilka, T; Bodrov, D; Branchini, P; Chang, M. -C; Chang, P; Cho, H. E; Cho, K; Choi, S. -K; Choi, Y; Cunliffe, S; Dash, N; Dhamija, R; Di Capua, F; Dingfelder, J; Dong, T. V; Ferber, T; Fulsom, B. G; Giri, A; Goldenzweig, P; Golob, B; Graziani, E; Hara, T; Hayasaka, K; Hedges, M. T; Hsu, C. -L; Inguglia, G; Itoh, R; Jacobs, W. W; Jin, Y; Joo, K. K; Kiesling, C; Kim, D. Y; Konno, T; Korobov, A; Kroeger, R; Krokovny, P; Kuhr, T; Kumar, M; Kumara, K; Lalwani, K; Li, Y; Liventsev, D; Martini, A; Masuda, M; Maurya, S. K; Metzner, F; Mizuk, R; Mohanty, G. B; Natochii, A; Nayak, L; Nayak, M; Ogawa, S; Onuki, Y; Pakhlova, G; Pardi, S; Passeri, A; Patra, S; Pestotnik, R; Piilonen, L. E; Popov, V; Röhrken, M; Sandilya, S; Sangal, A; Santelj, L; Sanuki, T; Schnell, G; Schwanda, C; Senyo, K; Sevior, M. E; Shapkin, M; Shebalin, V; Solovieva, E; Sumihama, M; Sumiyoshi, T; Takizawa, M; Tenchini, F; Uchida, M; Unno, Y; Urquijo, P; Usov, Y; Vahsen, S. E; Van Tonder, R; Varvell, K. E; Waheed, E; Wang, M. -Z; Won, E; Yan, W; Yin, J. H; Yuan, C. Z; Zhai, Y; Zhang, Z. P; Zhilich, V

    arXiv (Cornell University), 03/2022
    Journal Article

    Phys. Rev. D 106, 012006 (2022) 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 $772\times 10^6$ $B\bar{B}$ 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: $\mathcal{B}(B^0 \to K_S^0 K_S^0 \gamma) < 5.8\times10^{-7}$, $\mathcal{B}(B^0 \to f_2 \gamma)\times \mathcal{B}(f_2 (1270) \to K_S^0 K_S^0 ) < 3.1\times10^{-7}$, and $\mathcal{B}(B^0 \to f_2^{\prime} \gamma)\times \mathcal{B}(f_2^{\prime} (1525) \to K_S^0 K_S^0 ) < 2.1\times10^{-7}$. 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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