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Asner, D. \\v{C}ervenkov, D. Y. Kim, E. Graziani, E. Kovalenko, E. Prencipe, E. Solovieva, E. Won, F. Di Capua, F. Meier, F. Metzner, F. Tenchini, G. B. Mohanty, G. De Nardo, G. De Pietro, G. Pakhlova, G. Russo, G. Schnell, H. Aihara, H. Atmacan, H. E. Cho, H. Hayashii, H. Ono, H. Park, I. Adachi, I. Nakamura, J. Bennett, J. Borah, J. Dingfelder, J.-G. Shiu, J. Libby, J. Park, K. Belous, K. Chilikin, K. Cho, K. E. Varvell, K. Gudkova, K. Hayasaka, K.-H. Kim, K. Kinoshita, K. K. Joo, K. Kumara, K. Miyabayashi, K. Senyo, K. Sumisawa, K. Tanida, K. Trabelsi, L. Cao, L. E. Piilonen, L. K. Li, L. Li Gioi, L. Nayak, L. Santelj, L. Yuan, M. Bessner, M. Bra\\v{c}ko, M. Campajola, M.-C. Chang, M. E. Sevior, M. Iwasaki, M. Masuda, M. Merola, M. Nakao, M. Nayak, M. Niiyama, M. R\\\"ohrken, M. Stari\\v{c}, M. Takizawa, M. T. Hedges, M. T. Prim, M. Uchida, M.-Z. Wang, N. Ipsita, P. Branchini, P. Chang, P. Ecker, P. Goldenzweig, P. Kody\\v{s}, P. Kri\\v{z}an, P. Krokovny, P. Urquijo, R. Ayad, R. Dhamija, R. Itoh, R. Kumar, R. Mizuk, R. Mussa, R. Pestotnik, R. Tiwary, S. Al Said, S. Bahinipati, S. Choudhury, S. C. Lee, S. Das, S. Dubey, S. E. Vahsen, S. Hazra, S.-H. Park, S. Jia, S.-K. Choi, S. K. Maurya, S. Korpar, S. Nishida, S. Ogawa, S. Pardi, S. Paul, S. Sandilya, S. Uno, S. Watanuki, Sw. Banerjee, T. Ferber, T. Gu, T. Kawasaki, T. Kuhr, T. Kumita, T. Luo, T. Matsuda, T. Podobnik, T. V. Dong, U. Tamponi, V. Bhardwaj, V. Gaur, V. Savinov, V. Zhilich, V. Zhukova, W. Shan, W.-S. Hou, W. W. Jacobs, W. Yan, X. Xu, Y. B. Li, Y. Choi, Y. Jin, Y. J. Kim, Y.-J. Kwon, Y.-K. Kim, Y. Li, Y. Seino, Y.-T. Lai, Y. Unno, Y. Usov, Y. Yook, Z. Dole\\v{z}al, Z. Natkaniec, Z. P. Zhang","submitted_at":"2024-01-09T16:13:06Z","abstract_excerpt":"We present a measurement of $B^{0} \\rightarrow \\omega \\omega$, a charmless decay into two vector mesons, using 772 $\\times 10^6$ $B\\overline{B}$ pairs collected with the Belle detector at the KEKB $e^+e^-$ collider. The decay is observed with a significance of 7.9 standard deviations. 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Bobrov, A. Bozek, A. Budano, A. Giri, A. Ishikawa, A. J. Schwartz, A. Korobov, A. Natochii, A. Vinokurova, B. Bhuyan, B. D. Yabsley, Belle Collaboration: Y. Guan, B. G. Cheon, B. G. Fulsom, C. Hadjivasiliou, C. H. Kim, C.-L. Hsu, C. Schwanda, D. Biswas, D. Bodrov, D. Epifanov, D. Ferlewicz, D. Levit, D. Liventsev, D. M. Asner, D. \\v{C}ervenkov, D. Y. Kim, E. Graziani, E. Kovalenko, E. Prencipe, E. Solovieva, E. Won, F. Di Capua, F. Meier, F. Metzner, F. Tenchini, G. B. Mohanty, G. De Nardo, G. De Pietro, G. Pakhlova, G. Russo, G. Schnell, H. Aihara, H. Atmacan, H. E. Cho, H. Hayashii, H. Ono, H. Park, I. Adachi, I. Nakamura, J. Bennett, J. Borah, J. Dingfelder, J.-G. Shiu, J. Libby, J. Park, K. Belous, K. Chilikin, K. Cho, K. E. Varvell, K. Gudkova, K. Hayasaka, K.-H. Kim, K. Kinoshita, K. K. Joo, K. Kumara, K. Miyabayashi, K. Senyo, K. Sumisawa, K. Tanida, K. Trabelsi, L. Cao, L. E. Piilonen, L. K. Li, L. Li Gioi, L. Nayak, L. Santelj, L. Yuan, M. Bessner, M. Bra\\v{c}ko, M. 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