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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2004, vol. 93, p. 191802-1

Evidence for direct CP violation in B 0 → K + π - decays

Chao Y., Chang P., Abe K., Abe K., Abe N., Adachi I., Aihara H., Akai K., Akatsu M., Akemoto M., Asano Y., Aso T., Aulchenko V., Aushev T., Aziz T., Bahinipati S., Bakich A. M., Ban Y., Barbero M., Bay A., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang M. C., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi S. K., Choi Y., Choi Y. K., Chuvikov A., Cole S., Danilov M., Dash M., Dong L. Y., Dowd R., Dragic J., Drutskoy A., Eidelman S., Eiges V., Enari Y., Epifanov D., Everton C. W., Fang F., Flanagan J., Fratina S., Fujii H., Funakoshi Y., Furukawa K., Gabyshev N., Garmash A., Gershon T., Go A., Gokhroo G., Golob B., Grosse Perdekamp M., Guler H., Guo R., Haba J., Hagner C., Handa F., Hara K., Hara T., Hastings N. C., Hasuko K., Hayasaka K., Hayashii H., Hazumi M., Heenan E. M., Higuchi I., Higuchi T., Hinz L., Hojo T., Hokuue T., Hoshi Y., Hoshina K., Hou S., Hou W. S., Hsiung Y. B., Huang H. C., Igaki T., Igarashi Y., Iijima T., Ikeda H., Imoto A., Inami K., Ishikawa A., Ishino H., Itoh K., Itoh R.

The evidence for direct charged particles (CP) violation in the decay B 0→K + π - was investigated with 253 fb -1 of data collected with the Belle detector at the KEKB e + e - collider. 275 x 10 6 BB̄ pairs were used to observe a B→K ±π ∓ signal with 2140 ±53 events. Mixing induced CP violation in the B sector was established in b → cc̄s transitions. The result suggests large interference between tree and penguin diagrams and the existence of final state interactions.