Observation of large CP violation and evidence for direct CP violation in B0 → π+ π- decays

K. Abe; K. Abe; N. Abe; T. Abe; I. Adachi; H. Aihara; K. Akai; M. Akatsu; M. Akemoto; Y. Asano; T. Aso; V. Aulchenko; T. Aushev; A. M. Bakich; Y. Ban; S. Banerjee; A. Bay; I. Bedny; I. Bizjak; A. Bondar; A. Bozek; M. Bračko; T. E. Browder; Y. Chao; K. F. Chen; B. G. Cheon; R. Chistov; S. K. Choi; Y. Choi; A. Chuvikov; S. Cole; M. Danilov; J. Dragic; A. Drutskoy; S. Eidelman; V. Eiges; Y. Enari; D. Epifanov; J. Flanagan; K. Furukawa; N. Gabyshev; A. Garmash; T. Gershon; B. Golob; J. Haba; K. Hara; N. C. Hastings; H. Hayashii; M. Hazumi; L. Hinz; T. Hokuue; Y. Hoshi; W. S. Hou; Y. B. Hsiung; H. C. Huang; T. Iijima; H. Ikeda; K. Inami; A. Ishikawa; H. Ishino; R. Itoh; H. Iwasaki; M. Iwasaki; Y. Iwasaki; H. Kakuno; T. Kamitani; J. H. Kang; J. S. Kang; P. Kapusta; S. U. Kataoka; N. Katayama; H. Kawai; T. Kawasaki; A. Kibayashi; H. Kichimi; E. Kikutani; H. J. Kim; J. H. Kim; S. K. Kim; K. Kinoshita; P. Koppenburg; S. Korpar; P. Križan; P. Krokovny; S. Kumar; A. Kuzmin; Y. J. Kwon; J. S. Lange; G. Leder; S. H. Lee; Y. J. Lee; T. Lesiak; J. Li; A. Limosani; S. W. Lin; D. Liventsev; J. MacNaughton; F. Mandl; D. Marlow; H. Matsumoto; T. Matsumoto; A. Matyja; S. Michizono; T. Mimashi; W. Mitaroff; K. Miyabayashi; H. Miyake; H. Miyata; D. Mohapatra; G. R. Moloney; A. Murakami; T. Nagamine; Y. Nagasaka; T. Nakadaira; T. T. Nakamura; E. Nakano; M. Nakao; H. Nakazawa; Z. Natkaniec; K. Neichi; S. Nishida; O. Nitoh; S. Noguchi; T. Nozaki; S. Ogawa; Y. Ogawa; K. Ohmi; T. Ohshima; N. Ohuchi; K. Oide; T. Okabe; S. Okuno; S. L. Olsen; W. Ostrowicz; H. Ozaki; P. Pakhlov; H. Palka; C. W. Park; H. Park; N. Parslow; L. E. Piilonen; N. Root; M. Rozanska; H. Sagawa; Y. Sakai; O. Schneider; J. Schümann; C. Schwanda; A. J. Schwartz; S. Semenov; K. Senyo; H. Shibuya; T. Shidara; B. Shwartz; V. Sidorov; J. B. Singh; N. Soni; R. Stamen; S. Stanič; M. Starič; R. Sugahara; K. Sumisawa; T. Sumiyoshi; K. Suzuki; S. Suzuki; O. Tajima; F. Takasaki; K. Tamai; N. Tamura; M. Tanaka; M. Tawada; Y. Teramoto; T. Tomura; T. Tsuboyama; T. Tsukamoto; S. Uehara; T. Uglov; K. Ueno; Y. Unno; S. Uno; G. Varner; K. E. Varvell; C. C. Wang; C. H. Wang; M. Z. Wang; Y. Watanabe; B. D. Yabsley; Y. Yamada; A. Yamaguchi; Y. Yamashita; M. Yamauchi; H. Yanai; Heyoung Yang; J. Ying; M. Yokoyama; M. Yoshida; Y. Yusa; C. C. Zhang; Z. P. Zhang; T. Ziegler; D. Žontar; D. Zürcher

doi:10.1103/PhysRevLett.93.021601

Observation of large CP violation and evidence for direct CP violation in B⁰ → π⁺ π^- decays

K. Abe, K. Abe, N. Abe, T. Abe, I. Adachi, H. Aihara, K. Akai, M. Akatsu, M. Akemoto, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, S. Banerjee, A. Bay, I. Bedny, I. Bizjak, A. BondarA. Bozek, M. Bračko, T. E. Browder, Y. Chao, K. F. Chen, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, A. Chuvikov, S. Cole, M. Danilov, J. Dragic, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, D. Epifanov, J. Flanagan, K. Furukawa, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, J. Haba, K. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, L. Hinz, T. Hokuue, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. C. Huang, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, H. Iwasaki, M. Iwasaki, Y. Iwasaki, H. Kakuno, T. Kamitani, J. H. Kang, J. S. Kang, P. Kapusta, S. U. Kataoka, N. Katayama, H. Kawai, T. Kawasaki, A. Kibayashi, H. Kichimi, E. Kikutani, H. J. Kim, J. H. Kim, S. K. Kim, K. Kinoshita, P. Koppenburg, S. Korpar, P. Križan, P. Krokovny, S. Kumar, A. Kuzmin, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, Y. J. Lee, T. Lesiak, J. Li, A. Limosani, S. W. Lin, D. Liventsev, J. MacNaughton, F. Mandl, D. Marlow, H. Matsumoto, T. Matsumoto, A. Matyja, S. Michizono, T. Mimashi, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, D. Mohapatra, G. R. Moloney, A. Murakami, T. Nagamine, Y. Nagasaka, T. Nakadaira, T. T. Nakamura, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, Y. Ogawa, K. Ohmi, T. Ohshima, N. Ohuchi, K. Oide, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, H. Park, N. Parslow, L. E. Piilonen, N. Root, M. Rozanska, H. Sagawa, Y. Sakai, O. Schneider, J. Schümann, C. Schwanda, A. J. Schwartz, S. Semenov, K. Senyo, H. Shibuya, T. Shidara, B. Shwartz, V. Sidorov, J. B. Singh, N. Soni, R. Stamen, S. Stanič, M. Starič, R. Sugahara, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, O. Tajima, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, M. Tawada, Y. Teramoto, T. Tomura, T. Tsuboyama, T. Tsukamoto, S. Uehara, T. Uglov, K. Ueno, Y. Unno, S. Uno, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, M. Z. Wang, Y. Watanabe, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yanai, Heyoung Yang, J. Ying, M. Yokoyama, M. Yoshida, Y. Yusa, C. C. Zhang, Z. P. Zhang, T. Ziegler, D. Žontar, D. Zürcher

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

91 Citations (Scopus)

Abstract

The CP violation parameters in B^o → π ⁺π^- decay were investigated. The flavor of the accompanying B meson was identified by reconstructing B ^o→π⁺π^- CP eigenstate. It was observed that the expected sensitivity was optimized using the ratio LR. The study showed that there was a direct CP violation with a significance at or greater than 3.2σ.

Original language	English
Article number	021601
Pages (from-to)	021601-1-021601-5
Journal	Physical Review Letters
Volume	93
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.93.021601
Publication status	Published - Jul 9 2004
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.93.021601

Cite this

Abe, K., Abe, K., Abe, N., Abe, T., Adachi, I., Aihara, H., Akai, K., Akatsu, M., Akemoto, M., Asano, Y., Aso, T., Aulchenko, V., Aushev, T., Bakich, A. M., Ban, Y., Banerjee, S., Bay, A., Bedny, I., Bizjak, I., ... Zürcher, D. (2004). Observation of large CP violation and evidence for direct CP violation in B⁰ → π⁺ π^- decays. Physical Review Letters, 93(2), 021601-1-021601-5. [021601]. https://doi.org/10.1103/PhysRevLett.93.021601

Abe, K, Abe, K, Abe, N, Abe, T, Adachi, I, Aihara, H, Akai, K, Akatsu, M, Akemoto, M, Asano, Y, Aso, T, Aulchenko, V, Aushev, T, Bakich, AM, Ban, Y, Banerjee, S, Bay, A, Bedny, I, Bizjak, I, Bondar, A, Bozek, A, Bračko, M, Browder, TE, Chao, Y, Chen, KF, Cheon, BG, Chistov, R, Choi, SK, Choi, Y, Chuvikov, A, Cole, S, Danilov, M, Dragic, J, Drutskoy, A, Eidelman, S, Eiges, V, Enari, Y, Epifanov, D, Flanagan, J, Furukawa, K, Gabyshev, N, Garmash, A, Gershon, T, Golob, B, Haba, J, Hara, K, Hastings, NC, Hayashii, H, Hazumi, M, Hinz, L, Hokuue, T, Hoshi, Y, Hou, WS, Hsiung, YB, Huang, HC, Iijima, T, Ikeda, H, Inami, K, Ishikawa, A, Ishino, H, Itoh, R, Iwasaki, H, Iwasaki, M, Iwasaki, Y, Kakuno, H, Kamitani, T, Kang, JH, Kang, JS, Kapusta, P, Kataoka, SU, Katayama, N, Kawai, H, Kawasaki, T, Kibayashi, A, Kichimi, H, Kikutani, E, Kim, HJ, Kim, JH, Kim, SK, Kinoshita, K, Koppenburg, P, Korpar, S, Križan, P, Krokovny, P, Kumar, S, Kuzmin, A, Kwon, YJ, Lange, JS, Leder, G, Lee, SH, Lee, YJ, Lesiak, T, Li, J, Limosani, A, Lin, SW, Liventsev, D, MacNaughton, J, Mandl, F, Marlow, D, Matsumoto, H, Matsumoto, T, Matyja, A, Michizono, S, Mimashi, T, Mitaroff, W, Miyabayashi, K, Miyake, H, Miyata, H, Mohapatra, D, Moloney, GR, Murakami, A, Nagamine, T, Nagasaka, Y, Nakadaira, T, Nakamura, TT, Nakano, E, Nakao, M, Nakazawa, H, Natkaniec, Z, Neichi, K, Nishida, S, Nitoh, O, Noguchi, S, Nozaki, T, Ogawa, S, Ogawa, Y, Ohmi, K, Ohshima, T, Ohuchi, N, Oide, K, Okabe, T, Okuno, S, Olsen, SL, Ostrowicz, W, Ozaki, H, Pakhlov, P, Palka, H, Park, CW, Park, H, Parslow, N, Piilonen, LE, Root, N, Rozanska, M, Sagawa, H, Sakai, Y, Schneider, O, Schümann, J, Schwanda, C, Schwartz, AJ, Semenov, S, Senyo, K, Shibuya, H, Shidara, T, Shwartz, B, Sidorov, V, Singh, JB, Soni, N, Stamen, R, Stanič, S, Starič, M, Sugahara, R, Sumisawa, K, Sumiyoshi, T, Suzuki, K, Suzuki, S, Tajima, O, Takasaki, F, Tamai, K, Tamura, N, Tanaka, M, Tawada, M, Teramoto, Y, Tomura, T, Tsuboyama, T, Tsukamoto, T, Uehara, S, Uglov, T, Ueno, K, Unno, Y, Uno, S, Varner, G, Varvell, KE, Wang, CC, Wang, CH, Wang, MZ, Watanabe, Y, Yabsley, BD, Yamada, Y, Yamaguchi, A, Yamashita, Y, Yamauchi, M, Yanai, H, Yang, H, Ying, J, Yokoyama, M, Yoshida, M, Yusa, Y, Zhang, CC, Zhang, ZP, Ziegler, T, Žontar, D & Zürcher, D 2004, 'Observation of large CP violation and evidence for direct CP violation in B⁰ → π⁺ π^- decays', Physical Review Letters, vol. 93, no. 2, 021601, pp. 021601-1-021601-5. https://doi.org/10.1103/PhysRevLett.93.021601

@article{e2f21c4fa5ac4cf1ae06627db6da7802,

title = "Observation of large CP violation and evidence for direct CP violation in B0 → π+ π- decays",

abstract = "The CP violation parameters in Bo → π +π- decay were investigated. The flavor of the accompanying B meson was identified by reconstructing B o→π+π- CP eigenstate. It was observed that the expected sensitivity was optimized using the ratio LR. The study showed that there was a direct CP violation with a significance at or greater than 3.2σ.",

author = "K. Abe and K. Abe and N. Abe and T. Abe and I. Adachi and H. Aihara and K. Akai and M. Akatsu and M. Akemoto and Y. Asano and T. Aso and V. Aulchenko and T. Aushev and Bakich, {A. M.} and Y. Ban and S. Banerjee and A. Bay and I. Bedny and I. Bizjak and A. Bondar and A. Bozek and M. Bra{\v c}ko and Browder, {T. E.} and Y. Chao and Chen, {K. F.} and Cheon, {B. G.} and R. Chistov and Choi, {S. K.} and Y. Choi and A. Chuvikov and S. Cole and M. Danilov and J. Dragic and A. Drutskoy and S. Eidelman and V. Eiges and Y. Enari and D. Epifanov and J. Flanagan and K. Furukawa and N. Gabyshev and A. Garmash and T. Gershon and B. Golob and J. Haba and K. Hara and Hastings, {N. C.} and H. Hayashii and M. Hazumi and L. Hinz and T. Hokuue and Y. Hoshi and Hou, {W. S.} and Hsiung, {Y. B.} and Huang, {H. C.} and T. Iijima and H. Ikeda and K. Inami and A. Ishikawa and H. Ishino and R. Itoh and H. Iwasaki and M. Iwasaki and Y. Iwasaki and H. Kakuno and T. Kamitani and Kang, {J. H.} and Kang, {J. S.} and P. Kapusta and Kataoka, {S. U.} and N. Katayama and H. Kawai and T. Kawasaki and A. Kibayashi and H. Kichimi and E. Kikutani and Kim, {H. J.} and Kim, {J. H.} and Kim, {S. K.} and K. Kinoshita and P. Koppenburg and S. Korpar and P. Kri{\v z}an and P. Krokovny and S. Kumar and A. Kuzmin and Kwon, {Y. J.} and Lange, {J. S.} and G. Leder and Lee, {S. H.} and Lee, {Y. J.} and T. Lesiak and J. Li and A. Limosani and Lin, {S. W.} and D. Liventsev and J. MacNaughton and F. Mandl and D. Marlow and H. Matsumoto and T. Matsumoto and A. Matyja and S. Michizono and T. Mimashi and W. Mitaroff and K. Miyabayashi and H. Miyake and H. Miyata and D. Mohapatra and Moloney, {G. R.} and A. Murakami and T. Nagamine and Y. Nagasaka and T. Nakadaira and Nakamura, {T. T.} and E. Nakano and M. Nakao and H. Nakazawa and Z. Natkaniec and K. Neichi and S. Nishida and O. Nitoh and S. Noguchi and T. Nozaki and S. Ogawa and Y. Ogawa and K. Ohmi and T. Ohshima and N. Ohuchi and K. Oide and T. Okabe and S. Okuno and Olsen, {S. L.} and W. Ostrowicz and H. Ozaki and P. Pakhlov and H. Palka and Park, {C. W.} and H. Park and N. Parslow and Piilonen, {L. E.} and N. Root and M. Rozanska and H. Sagawa and Y. Sakai and O. Schneider and J. Sch{\"u}mann and C. Schwanda and Schwartz, {A. J.} and S. Semenov and K. Senyo and H. Shibuya and T. Shidara and B. Shwartz and V. Sidorov and Singh, {J. B.} and N. Soni and R. Stamen and S. Stani{\v c} and M. Stari{\v c} and R. Sugahara and K. Sumisawa and T. Sumiyoshi and K. Suzuki and S. Suzuki and O. Tajima and F. Takasaki and K. Tamai and N. Tamura and M. Tanaka and M. Tawada and Y. Teramoto and T. Tomura and T. Tsuboyama and T. Tsukamoto and S. Uehara and T. Uglov and K. Ueno and Y. Unno and S. Uno and G. Varner and Varvell, {K. E.} and Wang, {C. C.} and Wang, {C. H.} and Wang, {M. Z.} and Y. Watanabe and Yabsley, {B. D.} and Y. Yamada and A. Yamaguchi and Y. Yamashita and M. Yamauchi and H. Yanai and Heyoung Yang and J. Ying and M. Yokoyama and M. Yoshida and Y. Yusa and Zhang, {C. C.} and Zhang, {Z. P.} and T. Ziegler and D. {\v Z}ontar and D. Z{\"u}rcher",

note = "Funding Information: We thank the KEKB group for the excellent operation of the accelerator, the KEK Cryogenics group for the efficient operation of the solenoid, and the KEK computer group and the NII for valuable computing and Super-SINET network support. We acknowledge support from MEXT and JSPS (Japan); ARC and DEST (Australia); NSFC (Contract No. 10175071, China); DST (India); the BK21 program of MOEHRD and the CHEP SRC program of KOSEF (Korea); KBN (Contract No. 2P03B 01324, Poland); MIST (Russia); MESS (Slovenia); NSC and MOE (Taiwan); and DOE (USA).",

year = "2004",

month = jul,

day = "9",

doi = "10.1103/PhysRevLett.93.021601",

language = "English",

volume = "93",

pages = "021601--1--021601--5",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "2",

}

TY - JOUR

T1 - Observation of large CP violation and evidence for direct CP violation in B0 → π+ π- decays

AU - Abe, K.

AU - Abe, N.

AU - Abe, T.

AU - Adachi, I.

AU - Aihara, H.

AU - Akai, K.

AU - Akatsu, M.

AU - Akemoto, M.

AU - Asano, Y.

AU - Aso, T.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Bakich, A. M.

AU - Ban, Y.

AU - Banerjee, S.

AU - Bay, A.

AU - Bedny, I.

AU - Bizjak, I.

AU - Bondar, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Chao, Y.

AU - Chen, K. F.

AU - Cheon, B. G.

AU - Chistov, R.

AU - Choi, S. K.

AU - Choi, Y.

AU - Chuvikov, A.

AU - Cole, S.

AU - Danilov, M.

AU - Dragic, J.

AU - Drutskoy, A.

AU - Eidelman, S.

AU - Eiges, V.

AU - Enari, Y.

AU - Epifanov, D.

AU - Flanagan, J.

AU - Furukawa, K.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Gershon, T.

AU - Golob, B.

AU - Haba, J.

AU - Hara, K.

AU - Hastings, N. C.

AU - Hayashii, H.

AU - Hazumi, M.

AU - Hinz, L.

AU - Hokuue, T.

AU - Hoshi, Y.

AU - Hou, W. S.

AU - Hsiung, Y. B.

AU - Huang, H. C.

AU - Iijima, T.

AU - Ikeda, H.

AU - Inami, K.

AU - Ishikawa, A.

AU - Ishino, H.

AU - Itoh, R.

AU - Iwasaki, H.

AU - Iwasaki, M.

AU - Iwasaki, Y.

AU - Kakuno, H.

AU - Kamitani, T.

AU - Kang, J. H.

AU - Kang, J. S.

AU - Kapusta, P.

AU - Kataoka, S. U.

AU - Katayama, N.

AU - Kawai, H.

AU - Kawasaki, T.

AU - Kibayashi, A.

AU - Kichimi, H.

AU - Kikutani, E.

AU - Kim, H. J.

AU - Kim, J. H.

AU - Kim, S. K.

AU - Kinoshita, K.

AU - Koppenburg, P.

AU - Korpar, S.

AU - Križan, P.

AU - Krokovny, P.

AU - Kumar, S.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Lange, J. S.

AU - Leder, G.

AU - Lee, S. H.

AU - Lee, Y. J.

AU - Lesiak, T.

AU - Li, J.

AU - Limosani, A.

AU - Lin, S. W.

AU - Liventsev, D.

AU - MacNaughton, J.

AU - Mandl, F.

AU - Marlow, D.

AU - Matsumoto, H.

AU - Matsumoto, T.

AU - Matyja, A.

AU - Michizono, S.

AU - Mimashi, T.

AU - Mitaroff, W.

AU - Miyabayashi, K.

AU - Miyake, H.

AU - Miyata, H.

AU - Mohapatra, D.

AU - Moloney, G. R.

AU - Murakami, A.

AU - Nagamine, T.

AU - Nagasaka, Y.

AU - Nakadaira, T.

AU - Nakamura, T. T.

AU - Nakano, E.

AU - Nakao, M.

AU - Nakazawa, H.

AU - Natkaniec, Z.

AU - Neichi, K.

AU - Nishida, S.

AU - Nitoh, O.

AU - Noguchi, S.

AU - Nozaki, T.

AU - Ogawa, S.

AU - Ogawa, Y.

AU - Ohmi, K.

AU - Ohshima, T.

AU - Ohuchi, N.

AU - Oide, K.

AU - Okabe, T.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Ostrowicz, W.

AU - Ozaki, H.

AU - Pakhlov, P.

AU - Palka, H.

AU - Park, C. W.

AU - Park, H.

AU - Parslow, N.

AU - Piilonen, L. E.

AU - Root, N.

AU - Rozanska, M.

AU - Sagawa, H.

AU - Sakai, Y.

AU - Schneider, O.

AU - Schümann, J.

AU - Schwanda, C.

AU - Schwartz, A. J.

AU - Semenov, S.

AU - Senyo, K.

AU - Shibuya, H.

AU - Shidara, T.

AU - Shwartz, B.

AU - Sidorov, V.

AU - Singh, J. B.

AU - Soni, N.

AU - Stamen, R.

AU - Stanič, S.

AU - Starič, M.

AU - Sugahara, R.

AU - Sumisawa, K.

AU - Sumiyoshi, T.

AU - Suzuki, K.

AU - Suzuki, S.

AU - Tajima, O.

AU - Takasaki, F.

AU - Tamai, K.

AU - Tamura, N.

AU - Tanaka, M.

AU - Tawada, M.

AU - Teramoto, Y.

AU - Tomura, T.

AU - Tsuboyama, T.

AU - Tsukamoto, T.

AU - Uehara, S.

AU - Uglov, T.

AU - Ueno, K.

AU - Unno, Y.

AU - Uno, S.

AU - Varner, G.

AU - Varvell, K. E.

AU - Wang, C. C.

AU - Wang, C. H.

AU - Wang, M. Z.

AU - Watanabe, Y.

AU - Yabsley, B. D.

AU - Yamada, Y.

AU - Yamaguchi, A.

AU - Yamashita, Y.

AU - Yamauchi, M.

AU - Yanai, H.

AU - Yang, Heyoung

AU - Ying, J.

AU - Yokoyama, M.

AU - Yoshida, M.

AU - Yusa, Y.

AU - Zhang, C. C.

AU - Zhang, Z. P.

AU - Ziegler, T.

AU - Žontar, D.

AU - Zürcher, D.

N1 - Funding Information: We thank the KEKB group for the excellent operation of the accelerator, the KEK Cryogenics group for the efficient operation of the solenoid, and the KEK computer group and the NII for valuable computing and Super-SINET network support. We acknowledge support from MEXT and JSPS (Japan); ARC and DEST (Australia); NSFC (Contract No. 10175071, China); DST (India); the BK21 program of MOEHRD and the CHEP SRC program of KOSEF (Korea); KBN (Contract No. 2P03B 01324, Poland); MIST (Russia); MESS (Slovenia); NSC and MOE (Taiwan); and DOE (USA).

PY - 2004/7/9

Y1 - 2004/7/9

N2 - The CP violation parameters in Bo → π +π- decay were investigated. The flavor of the accompanying B meson was identified by reconstructing B o→π+π- CP eigenstate. It was observed that the expected sensitivity was optimized using the ratio LR. The study showed that there was a direct CP violation with a significance at or greater than 3.2σ.

AB - The CP violation parameters in Bo → π +π- decay were investigated. The flavor of the accompanying B meson was identified by reconstructing B o→π+π- CP eigenstate. It was observed that the expected sensitivity was optimized using the ratio LR. The study showed that there was a direct CP violation with a significance at or greater than 3.2σ.

UR - http://www.scopus.com/inward/record.url?scp=55549120092&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=55549120092&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.93.021601

DO - 10.1103/PhysRevLett.93.021601

M3 - Article

C2 - 15323897

AN - SCOPUS:55549120092

SN - 0031-9007

VL - 93

SP - 021601-1-021601-5

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

M1 - 021601

ER -

Observation of large CP violation and evidence for direct CP violation in B⁰ → π⁺ π^- decays

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