Measurements of the Branching Fraction, Polarization, and $CP$ Asymmetry for the Decay $B^0\to \omega \omega$

Journal Article · 21 August 2024 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.133.081801 · OSTI ID:2434062

Guan, Y. ; Schwartz, A. J. ; Kinoshita, K. ; Adachi, I. ; Aihara, H. ; Al Said, S. ; Asner, D. M. ; Atmacan, H. ; Ayad, R. ; Bahinipati, S. ; Banerjee, Sw. ; Belous, K. ; Bennett, J. ; Bessner, M. ; Bhardwaj, V. ; Bhuyan, B. ; Biswas, D. ; Bobrov, A. ; Bodrov, D. ; Borah, J. ; Bozek, A. ; Bračko, M. ; Branchini, P. ; Browder, T. E. ; Budano, A. ; Campajola, M. ; Cao, L. ; Červenkov, D. ; Chang, M. -C. ; Chang, P. ; Cheon, B. G. ; Chilikin, K. ; Cho, H. E. ; Cho, K. ; Choi, S. -K. ; Choi, Y. ; Choudhury, S. ; Das, S. ; De Nardo, G. ; De Pietro, G. ; Dhamija, R. ; Di Capua, F. ; Dingfelder, J. ; Doležal, Z. ; Dong, T. V. ; Dubey, S. ; Ecker, P. ; Epifanov, D. ; Ferber, T. ; Ferlewicz, D. ; Fulsom, B. G. ; Gaur, V. ; Giri, A. ; Goldenzweig, P. ; Graziani, E. ; Gu, T. ; Gudkova, K. ; Hadjivasiliou, C. ; Hayasaka, K. ; Hayashii, H. ; Hazra, S. ; Hedges, M. T. ; Hou, W. -S. ; Hsu, C. -L. ; Ipsita, N. ; Ishikawa, A. ; Itoh, R. ; Iwasaki, M. ; Jacobs, W. W. ; Jia, S. ; Jin, Y. ; Joo, K. K. ; Kawasaki, T. ; Kim, C. H. ; Kim, D. Y. ; Kim, K. -H. ; Kim, Y. J. ; Kim, Y. -K. ; Kodyš, P. ; Korobov, A. ; Korpar, S. ; Kovalenko, E. ; Križan, P. ; Krokovny, P. ; Kuhr, T. ; Kumar, R. ; Kumara, K. ; Kumita, T. ; Kwon, Y. -J. ; Lai, Y. -T. ; Lee, S. C. ; Levit, D. ; Li, L. K. ; Li, Y. ; Li, Y. B. ; Li Gioi, L. ; Libby, J. ; Liventsev, D. ; Luo, T. ; Masuda, M. ; Matsuda, T. ; Maurya, S. K. ; Meier, F. ; Merola, M. ; Metzner, F. ; Miyabayashi, K. ; Mizuk, R. ; Mohanty, G. B. ; Mussa, R. ; Nakamura, I. ; Nakao, M. ; Natkaniec, Z. ; Natochii, A. ; Nayak, L. ; Nayak, M. ; Niiyama, M. ; Nishida, S. ; Ogawa, S. ; Ono, H. ; Pakhlova, G. ; Pardi, S. ; Park, H. ; Park, J. ; Park, S. -H. ; Paul, S. ; Pestotnik, R. ; Piilonen, L. E. ; Podobnik, T. ; Prencipe, E. ; Prim, M. T. ; Röhrken, M. ; Russo, G. ; Sandilya, S. ; Santelj, L. ; Savinov, V. ; Schnell, G. ; Schwanda, C. ; Seino, Y. ; Senyo, K. ; Sevior, M. E. ; Shan, W. ; Shiu, J. -G. ; Solovieva, E. ; Starič, M. ; Sumisawa, K. ; Takizawa, M. ; Tamponi, U. ; Tanida, K. ; Tenchini, F. ; Tiwary, R. ; Trabelsi, K. ; Uchida, M. ; Unno, Y. ; Uno, S. ; Urquijo, P. ; Usov, Y. ; Vahsen, S. E. ; Varvell, K. E. ; Vinokurova, A. ; Wang, M. -Z. ; Watanuki, S. ; Won, E. ; Xu, X. ; Yabsley, B. D. ; Yan, W. ; Yook, Y. ; Yuan, L. ; Zhang, Z. P. ; Zhilich, V. ; Zhukova, V.

We present a comprehensive study of $B^0\to \omega \omega$ decays using $772\times {10}^{6}B\overline{B}$ pairs collected with the Belle detector at the KEKB $e^{+}{e}^{-}$ collider. This process is a suppressed charmless decay into two vector mesons and can exhibit interesting polarization and $CP$ violation. The decay is observed for the first time with a significance of 7.9 standard deviations. We measure a branching fraction $\mathcal{B}=(1.53\pm 0.29\pm 0.17)\times {10}^{-6}$ , a fraction of longitudinal polarization $f_L=0.87\pm 0.13\pm 0.13$ , and a time-integrated $CP$ asymmetry $A_{CP}=-0.44\pm 0.43\pm 0.11$ , where the first uncertainties listed are statistical and the second are systematic. This is the first observation of $B^0\to \omega \omega$ and the first measurements of $f_L$ and $A_{CP}$ for this decay. Published by the American Physical Society 2024

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC05-76RL01830
• OSTI ID: 2434062
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 133; ISSN 0031-9007; ISSN PRLTAO
• Publisher: American Physical SocietyCopyright Statement
• Country of Publication: United States
• Language: English