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  • Evidence for direct CP violation in B±→ηh± and observation of B0→ηK0
    Hoi, C-T; Chang, P; Aihara, H; Asner, D M; Aushev, T; Bakich, A M; Belous, K; Bhuyan, B; Bischofberger, M; Bondar, A; Bračko, M; Chang, M-C; Chao, Y; Chen, A; Chen, K-F; Chen, P; Cheon, B G; Chilikin, K; Cho, K; Choi, Y; Danilov, M; Drásal, Z; Drutskoy, A; Eidelman, S; Fast, J E; Gaur, V; Goh, Y M; Golob, B; Hoshi, Y; Hou, W-S; Hsiung, Y B; Inami, K; Ishikawa, A; Iwabuchi, M; Iwasaki, Y; Iwashita, T; Kang, J H; Kawasaki, T; Kim, H J; Kim, H O; Kim, J B; Kim, J H; Kim, K T; Kinoshita, K; Ko, B R; Kobayashi, N; Kodyš, P; Korpar, S; Križan, P; Kuhr, T; Kumita, T; Kwon, Y-J; Lee, S-H; Li, J; Liu, Z Q; Louvot, R; Matvienko, D; McOnie, S; Miyabayashi, K; Miyata, H; Mohanty, G B; Moll, A; Nakano, E; Neubauer, S; Nishimura, K; Nitoh, O; Park, C W; Park, H K; Petrič, M; Ritter, M; Röhrken, M; Sahoo, H; Sanuki, T; Schneider, O; Schwanda, C; Schwartz, A J; Senyo, K; Sevior, M E; Shapkin, M; Shebalin, V; Shibata, T-A; Sohn, Y-S; Sokolov, A; Solovieva, E; Sumihama, M; Tanaka, S; Tatishvili, G; Trabelsi, K; Uchida, M; Uglov, T; Uno, S; Varner, G; Wang, C H; Wang, M-Z; Wang, P; Watanabe, Y; Yamaoka, J; Yusa, Y; Zhilich, V; Zupanc, A

    Physical review letters, 01/2012, Letnik: 108, Številka: 3
    Journal Article

    We report measurements of the branching fractions and CP asymmetries for B(±)→ηh(±) (h=K or π) and the observation of the decay B(0)→ηK(0) from the final data sample of 772×10(6) B ̅B pairs collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The measured branching fractions are B(B(±)→ηK(±))=(2.12±0.23±0.11)×10(-6), B(B(±)→ηπ(±))=(4.07±0.26±0.21)×10(-6), and B(B(0)→ηK(0))=(1.27(-0.29)(+0.33)±0.08)×10(-6), where the last decay is observed for the first time with a significance of 5.4 standard deviations (σ). We also find evidence for CP violation in the charged B modes, A(CP)(B(±)→ηK(±))=-0.38±0.11±0.01 and A(CP)(B(±)→ηπ(±))=-0.19±0.06±0.01 with significances of 3.8 σ and 3.0 σ, respectively. For all measurements, the first and second uncertainties are statistical and systematic, respectively.

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