Measurement of the branching fraction and CP asymmetry in B0 → π0π0 decays, and an improved constraint on ϕ2

T. Julius; M. E. Sevior; G. B. Mohanty; I. Adachi; H. Aihara; S. Al Said; D. M. Asner; V. Aulchenko; T. Aushev; R. Ayad; V. Babu; I. Badhrees; A. M. Bakich; V. Bansal; E. Barberio; M. Barrett; M. Berger; V. Bhardwaj; B. Bhuyan; J. Biswal; T. Bloomfield; A. Bobrov; A. Bondar; G. Bonvicini; A. Bozek; M. Bračko; T. E. Browder; D. Červenkov; M. C. Chang; Y. Chao; V. Chekelian; A. Chen; B. G. Cheon; K. Chilikin; K. Cho; Y. Choi; D. Cinabro; N. Dash; S. Di Carlo; Z. Doležal; D. Dossett; Z. Drásal; D. Dutta; S. Eidelman; H. Farhat; J. E. Fast; T. Ferber; B. G. Fulsom; V. Gaur; N. Gabyshev; A. Garmash; R. Gillard; P. Goldenzweig; J. Haba; T. Hara; K. Hayasaka; H. Hayashii; W. S. Hou; C. L. Hsu; T. Iijima; K. Inami; A. Ishikawa; R. Itoh; Y. Iwasaki; W. W. Jacobs; I. Jaegle; Y. Jin; D. Joffe; K. K. Joo; J. Kahn; G. Karyan; P. Katrenko; T. Kawasaki; C. Kiesling; D. Y. Kim; H. J. Kim; J. B. Kim; K. T. Kim; M. J. Kim; S. H. Kim; Y. J. Kim; K. Kinoshita; P. Kodyš; S. Korpar; D. Kotchetkov; P. Križan; P. Krokovny; J. F. Krohn; T. Kuhr; R. Kulasiri; A. Kuzmin; Y. J. Kwon; J. S. Lange; I. S. Lee; C. H. Li; L. Li; Y. Li; L. Li Gioi; J. Libby; D. Liventsev; T. Luo; J. MacNaughton; M. Masuda; T. Matsuda; M. Merola; K. Miyabayashi; H. Miyata; R. Mizuk; H. K. Moon; T. Mori; R. Mussa; E. Nakano; M. Nakao; T. Nanut; K. J. Nath; Z. Natkaniec; M. Nayak; N. K. Nisar; S. Nishida; S. Ogawa; H. Ono; P. Pakhlov; G. Pakhlova; B. Pal; S. Pardi; C. S. Park; H. Park; L. Pesántez; R. Pestotnik; L. E. Piilonen; C. Pulvermacher; M. Ritter; H. Sahoo; Y. Sakai; M. Salehi; S. Sandilya; L. Santelj; T. Sanuki; Y. Sato; V. Savinov; O. Schneider; G. Schnell; C. Schwanda; A. J. Schwartz; Y. Seino; K. Senyo; V. Shebalin; T. A. Shibata; J. G. Shiu; B. Shwartz; A. Sokolov; E. Solovieva; M. Starič; T. Sumiyoshi; U. Tamponi; K. Tanida; F. Tenchini; K. Trabelsi; M. Uchida; S. Uehara; T. Uglov; Y. Unno; S. Uno; P. Urquijo; Y. Usov; C. Van Hulse; G. Varner; K. E. Varvell; A. Vossen; E. Waheed; C. H. Wang; M. Z. Wang; P. Wang; M. Watanabe; Y. Watanabe; E. Widmann; K. M. Williams; E. Won; Y. Yamashita; H. Ye; C. Z. Yuan; Y. Yusa; Z. P. Zhang; V. Zhilich; V. Zhulanov; A. Zupanc

doi:10.1103/PhysRevD.96.032007

Measurement of the branching fraction and CP asymmetry in B⁰ → π⁰π⁰ decays, and an improved constraint on ϕ₂

T. Julius
, M. E. Sevior
, G. B. Mohanty
, I. Adachi
, H. Aihara
, S. Al Said
, D. M. Asner
, V. Aulchenko
, T. Aushev
, R. Ayad
, V. Babu
, I. Badhrees
, A. M. Bakich
, V. Bansal
, E. Barberio
, M. Barrett
, M. Berger
, V. Bhardwaj
, B. Bhuyan
, J. Biswal

T. Bloomfield, A. Bobrov, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, M. C. Chang, Y. Chao, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, Y. Choi, D. Cinabro, N. Dash, S. Di Carlo, Z. Doležal, D. Dossett, Z. Drásal, D. Dutta, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, B. G. Fulsom, V. Gaur, N. Gabyshev, A. Garmash, R. Gillard, P. Goldenzweig, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, W. S. Hou, C. L. Hsu, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, Y. Iwasaki, W. W. Jacobs, I. Jaegle, Y. Jin, D. Joffe, K. K. Joo, J. Kahn, G. Karyan, P. Katrenko, T. Kawasaki, C. Kiesling, D. Y. Kim, H. J. Kim, J. B. Kim, K. T. Kim, M. J. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, P. Krokovny, J. F. Krohn, T. Kuhr, R. Kulasiri, A. Kuzmin, Y. J. Kwon, J. S. Lange, I. S. Lee, C. H. Li, L. Li, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, T. Luo, J. MacNaughton, M. Masuda, T. Matsuda, M. Merola, K. Miyabayashi, H. Miyata, R. Mizuk, H. K. Moon, T. Mori, R. Mussa, E. Nakano, M. Nakao, T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, N. K. Nisar, S. Nishida, S. Ogawa, H. Ono, P. Pakhlov, G. Pakhlova, B. Pal, S. Pardi, C. S. Park, H. Park, L. Pesántez, R. Pestotnik, L. E. Piilonen, C. Pulvermacher, M. Ritter, H. Sahoo, Y. Sakai, M. Salehi, S. Sandilya, L. Santelj, T. Sanuki, Y. Sato, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, A. J. Schwartz, Y. Seino, K. Senyo, V. Shebalin, T. A. Shibata, J. G. Shiu, B. Shwartz, A. Sokolov, E. Solovieva, M. Starič, T. Sumiyoshi, U. Tamponi, K. Tanida, F. Tenchini, K. Trabelsi, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, C. Van Hulse, G. Varner, K. E. Varvell, A. Vossen, E. Waheed, C. H. Wang, M. Z. Wang, P. Wang, M. Watanabe, Y. Watanabe, E. Widmann, K. M. Williams, E. Won, Y. Yamashita, H. Ye, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

University of Melbourne
Tata Institute of Fundamental Research
The Graduate University for Advanced Studies
High Energy Accelerator Research Organization, Tsukuba
The University of Tokyo
King Abdulaziz University
University of Tabuk
Pacific Northwest National Laboratory
RAS - Budker Institute of Nuclear Physics
Novosibirsk State University
Moscow Institute of Physics and Technology
King Abdulaziz City for Science and Technology
The University of Sydney
University of Hawai'i at Mānoa
Austrian Academy of Sciences
Indian Institute of Science Education and Research Mohali
Indian Institute of Technology Guwahati
Jožef Stefan Institute
Wayne State University
H. Niewodniczanski Institute of Nuclear Physics
University of Maribor
Charles University
Fu Jen Catholic University
National Taiwan University
Max Planck Institute for Physics (Werner Heisenberg Institute)
National Central University
Hanyang University
RAS - P.N. Lebedev Physics Institute
Moscow Engineering Physics Institute
Korea Institute of Science and Technology Information
Sungkyunkwan University
Indian Institute of Technology Bhubaneswar
German Electron Synchrotron
Virginia Polytechnic Institute and State University
Karlsruhe Institute of Technology
Niigata University
Nara Women's University
Nagoya University
Tohoku University
Indiana University Bloomington
University of Florida
Kennesaw State University
Chonnam National University
Ludwig Maximilian University of Munich
Soongsil University
Korea University
University of Cincinnati
University of Ljubljana
Yonsei University
Justus Liebig University Giessen
University of Science and Technology of China
Indian Institute of Technology Madras
University of Pittsburgh
University of Miyazaki
National Institute for Nuclear Physics
Osaka Metropolitan University
Toho University
Nippon Dental University
Kyungpook National University
University of Bonn
University of Malaya
Swiss Federal Institute of Technology Lausanne
University of the Basque Country
Ikerbasque Basque Foundation for Science
Yamagata University
Institute of Science Tokyo
Institute for High Energy Physics
Tokyo Metropolitan University
University of Turin
Japan Atomic Energy Agency
National United University Taiwan
CAS - Institute of High Energy Physics
Kanagawa University

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

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 e^þe⁻ collider. The obtained branching fraction and direct CP asymmetry are BðB → π⁰π⁰Þ ¼ ½1.31 0.19ðstatÞ 0.19ðsystÞ × 10⁻⁶ and A_CP 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 → π^þπ⁻ and B → ππ⁰ to exclude the CP-violating parameter ϕ₂ from the range 15.5° < ϕ₂ < 75.0° at 95% confidence level.

Original language	English
Article number	032007
Journal	Physical Review D
Volume	96
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevD.96.032007
State	Published - 1 Dec 2017

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10.1103/PhysRevD.96.032007

Cite this

Julius, T., Sevior, M. E., Mohanty, G. B., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Bansal, V., Barberio, E., Barrett, M., Berger, M., Bhardwaj, V., Bhuyan, B., ... Zupanc, A. (2017). Measurement of the branching fraction and CP asymmetry in B⁰ → π⁰π⁰ decays, and an improved constraint on ϕ₂ Physical Review D, 96(11), Article 032007. https://doi.org/10.1103/PhysRevD.96.032007

@article{5fe69bc0ce4545d6b93d259223cdb509,

title = "Measurement of the branching fraction and CP asymmetry in B0 → π0π0 decays, and an improved constraint on ϕ2 ",

abstract = "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 ϒ{\dh}4S{\TH} resonance with the Belle detector at the KEKB e{\th}e− collider. The obtained branching fraction and direct CP asymmetry are B{\dh}B → π0π0{\TH} ¼ ½1.31 0.19{\dh}stat{\TH} 0.19{\dh}syst{\TH} × 10−6 and ACP ¼ {\th}0.14 0.36{\dh}stat{\TH} 0.10{\dh}syst{\TH}, respectively. The signal significance, including the systematic uncertainty, is 6.4 standard deviations. We combine these results with Belle{\textquoteright}s earlier measurements of B0 → π{\th}π− and B → ππ0 to exclude the CP-violating parameter ϕ2 from the range 15.5° < ϕ2 < 75.0° at 95\% confidence level.",

author = "T. Julius and Sevior, \{M. E.\} and Mohanty, \{G. B.\} and I. Adachi and H. Aihara and \{Al Said\}, S. and Asner, \{D. M.\} and V. Aulchenko and T. Aushev and R. Ayad and V. Babu and I. Badhrees and Bakich, \{A. M.\} and V. Bansal and E. Barberio and M. Barrett and M. Berger and V. Bhardwaj and B. Bhuyan and J. Biswal and T. Bloomfield and A. Bobrov and A. Bondar and G. Bonvicini and A. Bozek and M. Bra{\v c}ko and Browder, \{T. E.\} and D. {\v C}ervenkov and Chang, \{M. C.\} and Y. Chao and V. Chekelian and A. Chen and Cheon, \{B. G.\} and K. Chilikin and K. Cho and Y. Choi and D. Cinabro and N. Dash and \{Di Carlo\}, S. and Z. Dole{\v z}al and D. Dossett and Z. Dr{\'a}sal and D. Dutta and S. Eidelman and H. Farhat and Fast, \{J. E.\} and T. Ferber and Fulsom, \{B. G.\} and V. Gaur and N. Gabyshev and A. Garmash and R. Gillard and P. Goldenzweig and J. Haba and T. Hara and K. Hayasaka and H. Hayashii and Hou, \{W. S.\} and Hsu, \{C. L.\} and T. Iijima and K. Inami and A. Ishikawa and R. Itoh and Y. Iwasaki and Jacobs, \{W. W.\} and I. Jaegle and Y. Jin and D. Joffe and Joo, \{K. K.\} and J. Kahn and G. Karyan and P. Katrenko and T. Kawasaki and C. Kiesling and Kim, \{D. Y.\} and Kim, \{H. J.\} and Kim, \{J. B.\} and Kim, \{K. T.\} and Kim, \{M. J.\} and Kim, \{S. H.\} and Kim, \{Y. J.\} and K. Kinoshita and P. Kody{\v s} and S. Korpar and D. Kotchetkov and P. Kri{\v z}an and P. Krokovny and Krohn, \{J. F.\} and T. Kuhr and R. Kulasiri and A. Kuzmin and Kwon, \{Y. J.\} and Lange, \{J. S.\} and Lee, \{I. S.\} and Li, \{C. H.\} and L. Li and Y. Li and \{Li Gioi\}, L. and J. Libby and D. Liventsev and T. Luo and J. MacNaughton and M. Masuda and T. Matsuda and M. Merola and K. Miyabayashi and H. Miyata and R. Mizuk and Moon, \{H. K.\} and T. Mori and R. Mussa and E. Nakano and M. Nakao and T. Nanut and Nath, \{K. J.\} and Z. Natkaniec and M. Nayak and Nisar, \{N. K.\} and S. Nishida and S. Ogawa and H. Ono and P. Pakhlov and G. Pakhlova and B. Pal and S. Pardi and Park, \{C. S.\} and H. Park and L. Pes{\'a}ntez and R. Pestotnik and Piilonen, \{L. E.\} and C. Pulvermacher and M. Ritter and H. Sahoo and Y. Sakai and M. Salehi and S. Sandilya and L. Santelj and T. Sanuki and Y. Sato and V. Savinov and O. Schneider and G. Schnell and C. Schwanda and Schwartz, \{A. J.\} and Y. Seino and K. Senyo and V. Shebalin and Shibata, \{T. A.\} and Shiu, \{J. G.\} and B. Shwartz and A. Sokolov and E. Solovieva and M. Stari{\v c} and T. Sumiyoshi and U. Tamponi and K. Tanida and F. Tenchini and K. Trabelsi and M. Uchida and S. Uehara and T. Uglov and Y. Unno and S. Uno and P. Urquijo and Y. Usov and \{Van Hulse\}, C. and G. Varner and Varvell, \{K. E.\} and A. Vossen and E. Waheed and Wang, \{C. H.\} and Wang, \{M. Z.\} and P. Wang and M. Watanabe and Y. Watanabe and E. Widmann and Williams, \{K. M.\} and E. Won and Y. Yamashita and H. Ye and Yuan, \{C. Z.\} and Y. Yusa and Zhang, \{Z. P.\} and V. Zhilich and V. Zhulanov and A. Zupanc",

note = "Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

month = dec,

day = "1",

doi = "10.1103/PhysRevD.96.032007",

language = "English",

volume = "96",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "11",

}

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, Luo, T, MacNaughton, J, Masuda, M, Matsuda, T, Merola, M, Miyabayashi, K, Miyata, H, Mizuk, R, Moon, HK, Mori, T, Mussa, R, Nakano, E, Nakao, M, Nanut, T, Nath, KJ, Natkaniec, Z, Nayak, M, Nisar, NK, Nishida, S, Ogawa, S, Ono, H, Pakhlov, P, Pakhlova, G, Pal, B, Pardi, S, Park, CS, Park, H, Pesántez, L, Pestotnik, R, Piilonen, LE, Pulvermacher, C, Ritter, M, Sahoo, H, Sakai, Y, Salehi, M, Sandilya, S, Santelj, L, Sanuki, T, Sato, Y, Savinov, V, Schneider, O, Schnell, G, Schwanda, C, Schwartz, AJ, Seino, Y, Senyo, K, Shebalin, V, Shibata, TA, Shiu, JG, Shwartz, B, Sokolov, A, Solovieva, E, Starič, M, Sumiyoshi, T, Tamponi, U, Tanida, K, Tenchini, F, Trabelsi, K, Uchida, M, Uehara, S, Uglov, T, Unno, Y, Uno, S, Urquijo, P, Usov, Y, Van Hulse, C, Varner, G, Varvell, KE, Vossen, A, Waheed, E, Wang, CH, Wang, MZ, Wang, P, Watanabe, M, Watanabe, Y, Widmann, E, Williams, KM, Won, E, Yamashita, Y, Ye, H, Yuan, CZ, Yusa, Y, Zhang, ZP, Zhilich, V, Zhulanov, V & Zupanc, A 2017, 'Measurement of the branching fraction and CP asymmetry in B⁰ → π⁰π⁰ decays, and an improved constraint on ϕ₂ ', Physical Review D, vol. 96, no. 11, 032007. https://doi.org/10.1103/PhysRevD.96.032007

TY - JOUR

T1 - Measurement of the branching fraction and CP asymmetry in B0 → π0π0 decays, and an improved constraint on ϕ2

AU - Julius, T.

AU - Sevior, M. E.

AU - Mohanty, G. B.

AU - Adachi, I.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Ayad, R.

AU - Babu, V.

AU - Badhrees, I.

AU - Bakich, A. M.

AU - Bansal, V.

AU - Barberio, E.

AU - Barrett, M.

AU - Berger, M.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Biswal, J.

AU - Bloomfield, T.

AU - Bobrov, A.

AU - Bondar, A.

AU - Bonvicini, G.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Červenkov, D.

AU - Chang, M. C.

AU - Chao, Y.

AU - Chekelian, V.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, K.

AU - Choi, Y.

AU - Cinabro, D.

AU - Dash, N.

AU - Di Carlo, S.

AU - Doležal, Z.

AU - Dossett, D.

AU - Drásal, Z.

AU - Dutta, D.

AU - Eidelman, S.

AU - Farhat, H.

AU - Fast, J. E.

AU - Ferber, T.

AU - Fulsom, B. G.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Gillard, R.

AU - Goldenzweig, P.

AU - Haba, J.

AU - Hara, T.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Hou, W. S.

AU - Hsu, C. L.

AU - Iijima, T.

AU - Inami, K.

AU - Ishikawa, A.

AU - Itoh, R.

AU - Iwasaki, Y.

AU - Jacobs, W. W.

AU - Jaegle, I.

AU - Jin, Y.

AU - Joffe, D.

AU - Joo, K. K.

AU - Kahn, J.

AU - Karyan, G.

AU - Katrenko, P.

AU - Kawasaki, T.

AU - Kiesling, C.

AU - Kim, D. Y.

AU - Kim, H. J.

AU - Kim, J. B.

AU - Kim, K. T.

AU - Kim, M. J.

AU - Kim, S. H.

AU - Kim, Y. J.

AU - Kinoshita, K.

AU - Kodyš, P.

AU - Korpar, S.

AU - Kotchetkov, D.

AU - Križan, P.

AU - Krokovny, P.

AU - Krohn, J. F.

AU - Kuhr, T.

AU - Kulasiri, R.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Lange, J. S.

AU - Lee, I. S.

AU - Li, C. H.

AU - Li, L.

AU - Li, Y.

AU - Li Gioi, L.

AU - Libby, J.

AU - Liventsev, D.

AU - Luo, T.

AU - MacNaughton, J.

AU - Masuda, M.

AU - Matsuda, T.

AU - Merola, M.

AU - Miyabayashi, K.

AU - Miyata, H.

AU - Mizuk, R.

AU - Moon, H. K.

AU - Mori, T.

AU - Mussa, R.

AU - Nakano, E.

AU - Nakao, M.

AU - Nanut, T.

AU - Nath, K. J.

AU - Natkaniec, Z.

AU - Nayak, M.

AU - Nisar, N. K.

AU - Nishida, S.

AU - Ogawa, S.

AU - Ono, H.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Pal, B.

AU - Pardi, S.

AU - Park, C. S.

AU - Park, H.

AU - Pesántez, L.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Pulvermacher, C.

AU - Ritter, M.

AU - Sahoo, H.

AU - Sakai, Y.

AU - Salehi, M.

AU - Sandilya, S.

AU - Santelj, L.

AU - Sanuki, T.

AU - Sato, Y.

AU - Savinov, V.

AU - Schneider, O.

AU - Schnell, G.

AU - Schwanda, C.

AU - Schwartz, A. J.

AU - Seino, Y.

AU - Senyo, K.

AU - Shebalin, V.

AU - Shibata, T. A.

AU - Shiu, J. G.

AU - Shwartz, B.

AU - Sokolov, A.

AU - Solovieva, E.

AU - Starič, M.

AU - Sumiyoshi, T.

AU - Tamponi, U.

AU - Tanida, K.

AU - Tenchini, F.

AU - Trabelsi, K.

AU - Uchida, M.

AU - Uehara, S.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, S.

AU - Urquijo, P.

AU - Usov, Y.

AU - Van Hulse, C.

AU - Varner, G.

AU - Varvell, K. E.

AU - Vossen, A.

AU - Waheed, E.

AU - Wang, C. H.

AU - Wang, M. Z.

AU - Wang, P.

AU - Watanabe, M.

AU - Watanabe, Y.

AU - Widmann, E.

AU - Williams, K. M.

AU - Won, E.

AU - Yamashita, Y.

AU - Ye, H.

AU - Yuan, C. Z.

AU - Yusa, Y.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zhulanov, V.

AU - Zupanc, A.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85048697874

U2 - 10.1103/PhysRevD.96.032007

DO - 10.1103/PhysRevD.96.032007

M3 - Article

AN - SCOPUS:85048697874

SN - 2470-0010

VL - 96

JO - Physical Review D

JF - Physical Review D

IS - 11

M1 - 032007

ER -

Measurement of the branching fraction and CP asymmetry in B⁰ → π⁰π⁰ decays, and an improved constraint on ϕ₂

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