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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2007, vol. 99, p. -

Measurements of branching fractions for bâ†KÏ€ and Bâ†Ï€Ï€ decays

Lin S. W., Chang P., Abe K., Abe K., Adachi I., Aihara H., Anipko D., Aulchenko V., Aushev T., Bahinipati S., Bakich A. M., Barberio E., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Browder T. E., Chang M. C., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi S. K., Choi Y., Choi Y. K., Dalseno J., Dash M., Dragic J., Drutskoy A., Eidelman S., Fratina S., Gabyshev N., Garmash A., Go A., Golob B., Ha H., Haba J., Hara T., Hayashii H., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou W. S., Hsiung Y. B., Iijima T., Ikado K., Imoto A., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kaji H., Kapusta P., Kataoka S. U., Kawai H., Kawasaki T., Kichimi H., Kim Y. J., Kinoshita K., Korpar S., Kričan P., Krokovny P., Kulasiri R., Kumar R., Kuzmin A., Kwon Y. J., Lee M. J., Lesiak T., Liventsev D., MacNaughton J., Mandl F., Matsumoto T., McOnie S., Medvedeva T., Mitaroff W., Miyake H., Miyata H., Miyazaki Y., Moloney G. R., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Ogawa S.

We report measurements of branching fractions for Bâ†KÏ € and Bâ†Ï€Ï€ decays based on a data sample of 449Ã-106 BB pairs collected at the Î¥(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We also measure the ratios of partial widths for Bâ†KÏ€ decays, namely Rcâ‰2Î"(B+â†K+Ï€0) /Î"(B+↠K0Ï€+)=1.08±0. 06±0.08 and Rnâ‰Î"(B0↠K+Ï€-)/2Î"(B0↠K0Ï€0)=1. 08±0.08±0.08, where the first and the second errors are statistical and systematic, respectively. These ratios are sensitive to enhanced electroweak penguin contributions from new physics; the new measurements are, however, consistent with standard model expectations. © 2007 The American Physical Society.