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  • Evidence for the decay B0->eta pi^0
    Abdesselam, A; Aihara, H; S Al Said; Asner, D M; Aulchenko, V; Badhrees, I; Bakich, A M; Bračko, M; Browder, T E; Červenkov, D; M -C Chang; Chekelian, V; Cheon, B G; Chobanova, V; Choi, Y; Dalseno, J; Doležal, Z; Drásal, Z; Dutta, D; Farhat, H; Fast, J E; Ferber, T; Gaur, V; Gabyshev, N; Ganguly, S; Garmash, A; Getzkow, D; Gillard, R; Glattauer, R; Golob, B; Hayasaka, K; Hayashii, H; He, X H; W -S Hou; Huschle, M; Ishikawa, A; Jaegle, I; Kiesling, C; Kim, D Y; Kim, J B; Kim, J H; Kim, S H; Kim, Y J; Kinoshita, K; Ko, B R; Korpar, S; Kuhr, T; Kuzmin, A; Y -J Kwon; Lange, J S; Lee, D H; Lee, I S; Lukin, P; Matvienko, D; Moon, H K; Nakamura, K R; Nanut, T; Nayak, M; Nishida, S; Pakhlov, P; Pakhlova, G; Park, C W; Park, H; Pedlar, T K; Pesántez, L; Petrič, M; Piilonen, L E; Pulvermacher, C; Sakai, Y; Sandilya, S; Santelj, L; Sanuki, T; Schneider, O; Senyo, K; Shapkin, M; Shebalin, V; Shen, C P; T -A Shibata; J -G Shiu; Sibidanov, A; Simon, F; M Su mihama; Teramoto, Y; Thorne, F; Uchida, M; Uehara, S; Unno, Y; C Van Hulse; Vanhoefer, P; Vorobyev, V; Vossen, A; Wang, C H; M -Z Wang; Wang, P; Watanabe, Y; Yamaoka, J; Yashchenko, S; Zhang, Z P; lich, V Zhi; Zhulanov, V

    arXiv.org, 07/2015
    Paper, Journal Article

    We report a search for the charmless hadronic decay \(B^0\to\eta \pi^0\) with a data sample corresponding to an integrated luminosity of 694 \(\rm fb^{-1}\) containing \(753\times10^6\) \(B\bar{B}\) pairs. The data were collected by the Belle experiment running on the \(\Upsilon(4S)\) resonance at the KEKB \(e^+e^-\) collider. We measure a branching fraction \(\mathcal{B}(B^0\to\eta\pi^0)=(4.1^{+1.7+0.5}_{-1.5-0.7})\times 10^{-7}\), where the first uncertainty is statistical and the second is systematic. Our measurement gives an upper limit of \(\mathcal{B}(B^0\to\eta\pi^0)<6.5\times 10^{-7}\) at 90\% confidence level. The signal has a significance of \(3.0\) standard deviations and constitutes the first evidence for this decay mode.

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