Measurement of the branching fraction and CP asymmetry in B0 → π0 π0 decays, and an improved constraint on ϕ2

Journal Article (Journal Article)

We measure the branching fraction and CP violation asymmetry in the decay B0 → π0π0, using a data sample of 752 × 106 BB¯ pairs collected at the ϒð4SÞ resonance with the Belle detector at the KEKB eþe− collider. The obtained branching fraction and direct CP asymmetry are BðB → π0π0Þ ¼ ½1.31 0.19ðstatÞ 0.19ðsystÞ × 10−6 and ACP ¼ þ0.14 0.36ðstatÞ 0.10ðsystÞ, respectively. The signal significance, including the systematic uncertainty, is 6.4 standard deviations. We combine these results with Belle’s earlier measurements of B0 → πþπ− and B → ππ0 to exclude the CP-violating parameter ϕ2 from the range 15.5° < ϕ2 < 75.0° at 95% confidence level.

Full Text

Duke Authors

Cited Authors

  • Julius, T; Sevior, ME; Mohanty, GB; Adachi, I; Aihara, H; Al Said, S; Asner, DM; Aulchenko, V; Aushev, T; Ayad, R; Babu, V; Badhrees, I; Bakich, AM; Bansal, V; Barberio, E; Barrett, M; Berger, M; Bhardwaj, V; Bhuyan, B; Biswal, J; Bloomfield, T; Bobrov, A; Bondar, A; Bonvicini, G; Bozek, A; Bračko, M; Browder, TE; Červenkov, D; Chang, MC; Chao, Y; Chekelian, V; Chen, A; Cheon, BG; Chilikin, K; Cho, K; Choi, Y; Cinabro, D; Dash, N; Di Carlo, S; Doležal, Z; Dossett, D; Drásal, Z; Dutta, D; Eidelman, S; Farhat, H; Fast, JE; Ferber, T; Fulsom, BG; Gaur, V; Gabyshev, N; Garmash, A; Gillard, R; Goldenzweig, P; Haba, J; Hara, T; Hayasaka, K; Hayashii, H; Hou, WS; Hsu, CL; Iijima, T; Inami, K; Ishikawa, A; Itoh, R; Iwasaki, Y; Jacobs, WW; Jaegle, I; Jin, Y; Joffe, D; Joo, KK; Kahn, J; Karyan, G; Katrenko, P; Kawasaki, T; Kiesling, C; Kim, DY; Kim, HJ; Kim, JB; Kim, KT; Kim, MJ; Kim, SH; Kim, YJ; Kinoshita, K; Kodyš, P; Korpar, S; Kotchetkov, D; Križan, P; Krokovny, P; Krohn, JF; Kuhr, T; Kulasiri, R; Kuzmin, A; Kwon, YJ; Lange, JS; Lee, IS; Li, CH; Li, L; Li, Y; Li Gioi, L; Libby, J; Liventsev, D

Published Date

  • December 1, 2017

Published In

Volume / Issue

  • 96 / 11

Electronic International Standard Serial Number (EISSN)

  • 2470-0029

International Standard Serial Number (ISSN)

  • 2470-0010

Digital Object Identifier (DOI)

  • 10.1103/PhysRevD.96.032007

Citation Source

  • Scopus