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  • Measurement of the branching fraction and $\it CP$ asymmetry of $B^{0} \rightarrow \pi^{0} \pi^{0}$ decays using $198 \times 10^6$ $B\overline{B}$ pairs in Belle II data
    Bahinipati, S; Bennett, J. V; Bertemes, M; Bračko, M; Branchini, P; Bussino, S; Campajola, M; Chang, M. -C; Chen, C; Cho, S. -J; Choi, S. -K; Choudhury, S; Cunliffe, S; De La Cruz-Burelo, E; De Nardo, G; De Nuccio, M; de Sangro, R; Destefanis, M; Dossett, D; Dujany, G; Eliachevitch, M; Ferlewicz, D; Finck, C; Finocchiaro, G; Frey, A; Fulsom, B. G; Giri, A; Gobbo, B; Goldenzweig, P; Granderath, S; Gudkova, K; Hazra, S; Villanueva, M. Hernández; Hsu, C. -L; Inami, K; Inguglia, G; Ishikawa, A; Iwasaki, M; Jackson, P; Ji, Q. P; Kang, S; Kiesling, C; Krokovny, P; Kuzmin, A; Kwon, Y. -J; Li, C; Li, L. K; Liptak, Z; Liventsev, D; Longo, S; Lyu, C; Maharana, S. P; Manoni, E; Massaccesi, L; Matsuda, T; McKenna, J. A; Merola, M; Milesi, M; Nakao, M; Nakayama, H; Naruki, M; Nisar, N. K; Paladino, A; Patra, S; Pedlar, T. K; Peschke, R; Piccolo, M; Piilonen, L. E; Pokharel, S; Polat, L; Prim, M. T; Rados, P; Morales, A. Ramirez; Rizzuto, L. B; Rout, N; Russo, G; Savinov, V; Schwartz, A. J; Shiu, J. -G; Simon, F; Singh, J. B; Starič, M; Sumisawa, K; Tamponi, U; Trabelsi, K; Uchida, M; Unger, K; Unno, Y; Uno, K; Vinokurova, A; Wakeling, H. M; Wang, X. L; Won, E; Yabsley, B. D; Yelton, J; Yoshihara, K; Yuan, C. Z; Zani, L; Zhang, Y; Zhukova, V. I

    arXiv (Cornell University), 03/2023
    Journal Article

    We report measurements of the branching fraction and $\it CP$ asymmetry in $B^{0} \to \pi^{0} \pi^{0}$ decays reconstructed at Belle II in an electron-positron collision sample containing $198 \times 10^{6}$ $B\overline{B}$ pairs. We measure a branching fraction $\mathcal{B}(\Bpipi) = (1.38 \pm 0.27 \pm 0.22) \times 10^{-6}$ and a $\it CP$ asymmetry $\Acp(\Bpipi) = 0.14 \pm 0.46 \pm 0.07$, where the first uncertainty is statistical and the second is systematic.

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