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

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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.

Original languageEnglish
Article number021601
Pages (from-to)021601-1-021601-5
JournalPhysical review letters
Volume93
Issue number2
DOIs
Publication statusPublished - 2004 Jul 9

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    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