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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2006, vol. 74, p. -

Improved measurements of branching fractions and CP partial rate asymmetries for B→ωK and B→ωπ

Jen C. M., Chang P., Abe K., Abe K., Adachi I., Aihara H., Anipko D., Arinstein K., Aulchenko V., Bakich A. M., Barberio E., Barbero M., Bay A., Bedny I., Belous K., Bitenc U., Bizjak I., Bondar A., Bozek A., Bračko M., Browder T. E., Chen A., Chen W. T., Cheon B. G., Choi S. K., Choi Y., Choi Y. K., Chuvikov A., Cole S., Dalseno J., Dash M., Drutskoy A., Eidelman S., Epifanov D., Fratina S., Gabyshev N., Gershon T., Go A., Gokhroo G., Golob B., Ha H., Haba J., Hara T., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kapusta P., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim H. J., Kim Y. J., Križan P., Krokovny P., Kulasiri R., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Leder G., Lee S. E., Lee Y. J., Lesiak T., Lin S. W., Liventsev D., Mandl F., Matsumoto T., McOnie S., Mitaroff W., Miyake H., Miyata H., Miyazaki Y., Nagamine T., Nagasaka Y., Nakano E., Nakao M., Natkaniec Z., Nishida S., Nitoh O., Nozaki T., Ogawa S., Ohshima T.

We report improved measurements of B to pseudoscalar-vector decays containing an ω meson in the final state. Our results are obtained from a data sample that contains 388×106 BB̄ pairs accumulated at the Υ(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e+e- collider. We measure the following branching fractions: B(B+→ωK+)= [8.1±0.6(stat.)±0.6(syst.)]×10-6, B(B+→ωπ+)= [6.9±0.6(stat.)±0.5(syst.)]×10-6, and B(B0→ωK0)= [4.4-0.7+0.8(stat.)±0.4(syst.)]×10-6. The partial width ratio Γ(B+→ωK+)Γ(B0→ωK0)=1.7±0.3(stat.) ±0.1(sys.). We also set the 90% confidence level upper limit B(B0→ωπ0)<2.0×10-6. In addition, we obtain the partial rate asymmetries ACP=0.05-0.07+0.08(stat.)±0.01(syst.) for B+→ωK+, and ACP=-0.02±0.09(stat.)±0.01(syst.) for B+→ωπ+. © 2006 The American Physical Society.