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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2005, vol. 71, p. 031502-1

Improved measurements of the partial rate asymmetry in B → hh decays

Chào Y., Chang P., Abe K., Abe K., Aihara H., Asano Y., Aushev T., Bahinipati S., Bakich A. M., Ban Y., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bračko M., Brodzicka J., Browder T. E., Chen K. F., Cheon B. G., Chistov R., Choi S. K., Choi Y., Cole S., Danilov M., Dash M., Dong L. Y., Eidelman S., Eiges V., Fratina S., Gabyshev N., Gershon T., Gokhroo G., Golob B., Guo R., Haba J., Hastings N. C., Hayasaka K., Hayashii H., Hazumi M., Higuchi T., Hinz L., Hokuue T., Hoshi Y., Hou W. S., Hsiung Y. B., Iijima T., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki H., Iwasaki Y., Kakuno H., Kang J. H., Kang J. S., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kim H. J., Kim J. H., Kinoshita K., Koppenburg P., Korpar S., Krokovny P., Kwon Y. J., Leder G., Lee Y. J., Lesiak T., Li J., Lin S. W., MacNaughton J., Mandl F., Marlow D., Matsumoto T., Matyja A., Mitaroff W., Miyake H., Miyata H., Mori T., Nagamine T., Nagasaka Y., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okabe T., Okuno S., Olsen S. L., Ostrowicz W., Ozaki H.

We report improved measurements of the partial rate asymmetry (A CP) in B → hh decays with 140 fb -1 of data collected with the Belle detector at the KEKB e +e - collider. Here h stands for a charged or neutral pion or kaon and in total five decay modes are included: K ±π ±, K s 0π ±, K ±π 0, π ±π 0, and K s 0π 0. The flavor of the last decay mode is determined from the accompanying B meson. Using a data sample 4.7 times larger than that of our previous measurement, we find A CP(K ±π ±) - 0.088 ± 0.035 ± 0.013, 2.4σ from zero. Results for other decay modes are also presented. © 2005 The American Physical Society.