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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2007, vol. 75, p. -

Improved measurements of branching fractions and CP asymmetries in B→ηh decays

Chang P., Abe K., Adachi I., Aihara H., Anipko D., Bakich A. M., Barberio E., Bay A., Bitenc U., Bizjak I., Bondar A., Bozek A., Bračko M., Browder T. E., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi S. K., Choi Y., Choi Y. K., Cole S., Dalseno J., Dash M., Dragic J., Eidelman S., Fratina S., Gabyshev N., Go A., Gorišek A., Ha H., Haba J., Hara K., Hayashii H., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou S., Hou W. S., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kaji H., Kang J. H., Kataoka S. U., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim Y. J., Kinoshita K., Korpar S., Krokovny P., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee M. J., Lee S. E., Lesiak T., Lin S. W., Mandl F., Matsumoto T., McOnie S., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Mori T., Nagasaka Y., Nakao M., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Onuki Y., Ozaki H., Pakhlov P., Pakhlova G., Park H., Peak L. S., Pestotnik R., Piilonen L. E., Sakai Y., Satoyama N., Schietinger T., Schneider O., Schümann J., Schwanda C.

We report improved measurements of B decays with an η meson in the final state using 492fb-1 of data collected by the Belle detector at the KEKB e+e- collider. We observe the decays B±→ηπ± and B±→ηK± and measure the branching fractions B(B±→ηπ±)=(4.2±0.4(stat)±0.2(sys)) ×10-6 and B(B±→ηK±)=(1.9±0.3(stat)-0.1+0. 2(sys))×10-6. The corresponding CP-violating asymmetries are measured to be -0.23±0.09(stat)±0.02(sys) for ηπ± and -0.39±0.16(stat)±0.03(sys) for ηK±. We also search for B0→ηK0 decays and set an upper limit of 1.9×10-6 at the 90% confidence level. © 2007 The American Physical Society.