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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2001, vol. 64, p. -

Search for direct CP violation in B→K π decays

Abe K., Abe K., Abe R., Adachi I., Ahn Byoung Sup, Aihara H., Akatsu M., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Banas E., Behari S., Behera P. K., Bondar A., Bozek A., Browder T. E., Casey B. C K, Chang P., Chao Y., Chen K. F., Cheon B. G., Chistov R., Choi S. K., Choi Y., Dong L. Y., Dragic J., Drutskoy A., Eidelman S., Enomoto R., Fang F., Fujii H., Fukunaga C., Fukushima M., Garmash A., Gordon A., Gotow K., Guo R., Haba J., Hamasaki H., Hanagaki K., Handa F., Hara K., Hara T., Hastings N. C., Hayashii H., Hazumi M., Heenan E. M., Higuchi I., Higuchi T., Hirano H., Hojo T., Hokuue T., Hoshi Y., Hou S. R., Hou W. S., Hsu S. C., Huang H. C., Igarashi Y., Iijima T., Ikeda H., Inami K., Ishikawa A., Ishino H., Itoh R., Iwai G., Iwasaki H., Iwasaki Y., Jackson D. J., Jalocha P., Jang H. K., Jones M., Kang J. H., Kang J. S., Kapusta P., Katayama N., Kawai H., Kawai H., Kawakami Y., Kawamura N., Kawasaki T., Kichimi H., Kim D. W., Kim Heejong, Kim H. J., Kim Hyunwoo, Kim S. K., Kim T. H., Kinoshita K., Konishi H., Krokovny P., Kulasiri R., Kumar S., Kurihara E., Kuzmin A., Kwon Y. J., Lange J. S.

We search for direct CP violation in flavor specific B→Kπ decays by measuring the rate asymmetry between charge conjugate modes.The search is performed on a data sample of 11.1× 106 BB̄ events recorded on the Υ(4S) resonance by the Belle experiment at KEKB. We measure 90% confidence intervals in the partial rate asymmetry ACP of -0.25< ACP(K± π±)<0.37,_ -0.40<ACP(K± π0)<0.36, and -0.53 <ACP(K± + π0)<0.82. By combining the K± π± and K± π0 final states, we conclude that -0.22 <ACP(K±(π±: + π0))<0.25 at the 90% confidence level. ©2001 The American Physical Society.