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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2004, vol. 69, p. -

Improved measurements of the branching fractions for B√Kπ, ππ, and KK decays

Chao Y., Suzuki K., Unno Y., Abe K., Abe K., Abe T., Adachi I., Aihara H., Akatsu M., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Banerjee S., Bizjak I., Bondar A., Bozek A., Bračko M., Browder T. E., Chang P., Cheon B. G., Chistov R., Choi S. K., Choi Y., Choi Y. K., Chuvikov A., Cole S., Danilov M., Dash M., Dong L. Y., Dragic J., Drutskoy A., Eidelman S., Eiges V., Gabyshev N., Garmash A., Gershon T., Golob B., Gordon A., Haba J., Hara T., Hazumi M., Higuchi I., Hokuue T., Hoshi Y., Hou W. S., Hsiung Y. B., Huang H. C., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki H., Iwasaki Y., Kang J. H., Kang J. S., Kapusta P., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim J. H., Kinoshita K., Korpar S., Križan P., Krokovny P., Kuzmin A., Kwon Y. J., Lange J. S., Leder G., Lee S. H., Li J., Limosani A., Lin S. W., MacNaughton J., Majumder G., Mandl F., Marlow D., Matsumoto T., Matyja A., Mitaroff W., Miyake H., Miyata H., Mohapatra D., Mori T., Nagamine T., Nagasaka Y., Nakadaira T., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S.

We report improved measurements of branching fractions for B→Kπ, π +π -, π +π 0, and KK̄ decays based on a data sample of 85.0 million BB̄ pairs collected at the Y(45) resonance with the Belle detector at the KEKB e +e - storage ring. This data sample is almost three times larger than the sample previously used. We observe clear signals for B→Kπ, π + π - and π +π 0 decays and set upper limits on B→KK̄ decays. The results can be used to give model-dependent constraints on the CKM angle φ 3, as well as limits on the hadronic uncertainty in the time-dependent analysis of the angle φ 2. © 2004 The American Physical Society.