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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2005, vol. 71, p. 1-6

Measurements of branching fractions and CP asymmetries in B→ηh decays

Chang P., Abe K., Abe K., Aihara H., Akatsu M., Asano Y., Aushev T., Bakich A. M., Balagura V., Ban Y., Banerjee S., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chao Y., Chen A., Chen K. F., Cheon B. G., Chistov R., Choi S. K., Choi Y., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Dragic J., Drutskoy A., Eidelman S., Eiges V., Fratina S., Gabyshev N., Garmash A., Gershon T., Gokhroo G., Guo R., Haba J., Hayasaka K., Hayashii H., Hazumi M., Hokuue T., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Huang H. C., Iijima T., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kang J. S., Kapusta P., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim H. J., Kim J. H., Kim S. K., Kim S. M., Koppenburg P., Korpar S., Krian P., Krokovny P., Kulasiri R., Kuo C. C., Kwon Y. J., Lee S. E., Lee S. H., Lesiak T., Li J., Lin S. W., Liventsev D., Majumder G., Mandl F., Matsumoto T., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Mizuk R., Mohapatra D., Mori T., Nagamine T., Nagasaka Y.

We report measurements of B to pseudoscalar-pseudoscalar decays with at least one η meson in the final state using 140fb-1 of data collected by the Belle detector at KEKB e+e- collider. We observe the decay B+→ηπ+ and find evidence of B+→ηK+; the measured branching fractions are B(B+→ηπ+)=(4.8-0.7+0.8(stat)±0.3(sys))×10-6 and B(B+→ηK+)=(2.1±0.6(stat)±0.2(sys))×10-6. Their corresponding CP violating asymmetries are measured to be 0.07±0.15(stat) ±0.03(sys) for ηπ± and -0.49±0.31(stat)±0. 07(sys) for ηK±. No significant signals are found for neutral B→ηh decays. We report the following upper limits on branching fractions at the 90% confidence level: B(B0→ηK0)<2.0×10-6, B(B0→ηπ0)<2.5×10-6 and B(B0→ηη)<2. 0×10-6. © 2005 The American Physical Society.