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. BiswalT. 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

Department of Physics

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

20 Citations (Scopus)

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
Publication status	Published - 2017 Dec 1

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

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), [032007]. https://doi.org/10.1103/PhysRevD.96.032007

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

@article{a8db787df6c34fbaa0338cdb329b426b,

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 = "Funding Information: computing group for valuable computing and SINET5 network support. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan, the Japan Society for the Promotion of Science (JSPS), and the Tau-Lepton Physics Research Center of Nagoya University; the Australian Research Council; Austrian Science Fund under Grant No. P 26794-N20; the National Natural Science Foundation of China under Contracts No. 10575109, No. 10775142, No. 10875115, No. 11175187, No. 11475187, No. 11521505 and No. 11575017; the Chinese Academy of Science Center for Excellence in Particle Physics; the Ministry of Education, Youth and Sports of the Czech Republic under Contract No. LTT17020; the Carl Zeiss Foundation, the Deutsche Forschungsgemeinschaft, the Excellence Cluster Universe, and the VolkswagenStiftung; the Department of Science and Technology of India; the Istituto Nazionale di Fisica Nucleare of Italy; the WCU program of the Ministry of Education, National Research Foundation (NRF) of Korea Grants No. 2011-0029457, No. 2012-0008143, No. 2014R1A2A2A01005286, No. 2014R1A2A2A01002734, No. 2015R1A2A2A01003280, No. 2015H1A2A1033649, No. 2016R1D1A1B01010135, No. 2016K1A3A7A09005603, No. 2016K1A3A7A09005604, No. 2016R1D1A1B02012900, No. 2016K1A3A7A09005606, No. NRF-2013K1A3A7A06056592; the Brain Korea 21-Plus program, Radiation Science Research Institute, Foreign Large-size Research Facility Application Supporting project and the Global Science Experimental Data Hub Center of the Korea Institute of Science and Technology Information; the Polish Ministry of Science and Higher Education and the National Science Center; the Ministry of Education and Science of the Russian Federation and the Russian Foundation for Basic Research; the Slovenian Research Agency; Ikerbasque, Basque Foundation for Science and MINECO (Juan de la Cierva), Spain; the Swiss National Science Foundation; the Ministry of Education and the Ministry of Science and Technology of Taiwan; and the U.S. Department of Energy and the National Science Foundation. 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",

}

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.

N1 - Funding Information: computing group for valuable computing and SINET5 network support. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan, the Japan Society for the Promotion of Science (JSPS), and the Tau-Lepton Physics Research Center of Nagoya University; the Australian Research Council; Austrian Science Fund under Grant No. P 26794-N20; the National Natural Science Foundation of China under Contracts No. 10575109, No. 10775142, No. 10875115, No. 11175187, No. 11475187, No. 11521505 and No. 11575017; the Chinese Academy of Science Center for Excellence in Particle Physics; the Ministry of Education, Youth and Sports of the Czech Republic under Contract No. LTT17020; the Carl Zeiss Foundation, the Deutsche Forschungsgemeinschaft, the Excellence Cluster Universe, and the VolkswagenStiftung; the Department of Science and Technology of India; the Istituto Nazionale di Fisica Nucleare of Italy; the WCU program of the Ministry of Education, National Research Foundation (NRF) of Korea Grants No. 2011-0029457, No. 2012-0008143, No. 2014R1A2A2A01005286, No. 2014R1A2A2A01002734, No. 2015R1A2A2A01003280, No. 2015H1A2A1033649, No. 2016R1D1A1B01010135, No. 2016K1A3A7A09005603, No. 2016K1A3A7A09005604, No. 2016R1D1A1B02012900, No. 2016K1A3A7A09005606, No. NRF-2013K1A3A7A06056592; the Brain Korea 21-Plus program, Radiation Science Research Institute, Foreign Large-size Research Facility Application Supporting project and the Global Science Experimental Data Hub Center of the Korea Institute of Science and Technology Information; the Polish Ministry of Science and Higher Education and the National Science Center; the Ministry of Education and Science of the Russian Federation and the Russian Foundation for Basic Research; the Slovenian Research Agency; Ikerbasque, Basque Foundation for Science and MINECO (Juan de la Cierva), Spain; the Swiss National Science Foundation; the Ministry of Education and the Ministry of Science and Technology of Taiwan; and the U.S. Department of Energy and the National Science Foundation. Publisher Copyright: © 2017 American Physical Society.

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 - http://www.scopus.com/inward/record.url?scp=85048697874&partnerID=8YFLogxK

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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