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

Measurement of charmless B decays to ηk* and ηρ

Wang C. H., Abe K., Adachi I., Aihara H., Anipko D., Aushev T., Bakich A. M., Barberio E., Bay A., Belous K., Bitenc U., Blyth S., Bondar A., Bozek A., Bračko M., Chang P., Chao Y., Chen A., Chen W. T., Cheon B. G., Chistov R., Choi Y., Choi Y. K., Cole S., Dalseno J., Drutskoy A., Eidelman S., Fratina S., Gabyshev N., Garmash A., Gershon T., Gokhroo G., Golob B., Ha H., Haba J., Hara T., Hayasaka K., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou W. S., Iijima T., Ikado K., Imoto A., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kaji H., Kang J. H., Kapusta P., Katayama N., Khan H. R., Kichimi H., Kim Y. J., Kinoshita K., Kulasiri R., Kumar R., Kuo C. C., Kwon Y. J., Leder G., Lee M. J., Lee S. E., Lesiak T., Lin S. W., Liventsev D., MacNaughton J., Matsumoto T., Matyja A., McOnie S., Miyake H., Miyata H., Mizuk R., Nakano E., Nakao M., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Onuki Y., Ozaki H., Pakhlov P., Pakhlova G., Park H., Park K. S., Pestotnik R., Piilonen L. E., Sakai Y., Satoyama N., Schneider O., Schümann J.

We report measurements of branching fractions and CP asymmetries for B→ηK* and B→ηρ decays. These results are obtained from a 414fb-1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We measure the following branching fractions: B(B0→ηK*0)=(15.2±1.2±1.0) ×10-6 and B(B+→ηK*+)=(19.3-1.9+2.0±1.5)×10-6, where the first error is statistical and the second systematic. We also find a 2.7σ excess in the B+→ηρ+ mode and measure B(B+→ηρ+)=(4.1-1.3+1.4±0.4)×10-6<6.5×10-6 at 90% confidence level. For B0→ηρ0 decays, we determine the upper limit B(B0→ηρ0)<1.9×10-6 at 90% confidence level. The partial rate asymmetries are ACP(ηK*0)=0.17±0.08±0.01, ACP(ηK*+)=0.03±0.10±0.01, and ACP(ηρ+)=-0.04-0. 32+0.34±0.01. © 2007 The American Physical Society.