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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2004, vol. 93, p. 021601-1

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

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., Bondar A., Bozek A., Bračko M., Browder T. E., Chao Y., Chen K. F., Cheon B. G., Chistov R., Choi S. K., 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 N. C., Hayashii H., Hazumi M., Hinz L., Hokuue T., Hoshi Y., Hou W. S., Hsiung Y. B., Huang H. C., Iijima T., Ikeda H., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki H., Iwasaki M., Iwasaki Y., Kakuno H., Kamitani T., Kang J. H., Kang J. S., Kapusta P., Kataoka S. U., Katayama N., Kawai H., Kawasaki T., Kibayashi A., Kichimi H., Kikutani E., Kim H. J., Kim J. H., Kim S. K., Kinoshita K., Koppenburg P., Korpar S., Križan P., Krokovny P., Kumar S., Kuzmin A., Kwon Y. J., Lange J. S., Leder G., Lee S. H., Lee Y. J., Lesiak T., Li J., Limosani A., Lin S. W.

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.