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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2008, vol. 101, p. -

Evidence for neutral B meson decays to ωk*0

Goldenzweig P., Schwartz A. J., Adachi I., Aihara H., Arinstein K., Aulchenko V., Aushev T., Bahinipati S., Bakich A. M., Bay A., Bedny I., Bhardwaj V., Bitenc U., Bondar A., Bozek A., Bračko M., Browder T. E., Chang P., Chao Y., Chen A., Chen K. F., Cheon B. G., Chiang C. C., Chistov R., Cho I. S., Choi Y., Dalseno J., Dash M., Drutskoy A., Eidelman S., Golob B., Ha H., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Inami K., Ishikawa A., Ishino H., Iwasaki M., Kah D. H., Kang J. H., Kawasaki T., Kichimi H., Kim H. J., Kim S. K., Kim Y. I., Kim Y. J., Kinoshita K., Korpar S., Križan P., Krokovny P., Kumar R., Kuzmin A., Kwon Y. J., Kyeong S. H., Lange J. S., Lee J. S., Lee M. J., Lee S. E., Lesiak T., Li J., Limosani A., Lin S. W., Liu C., Liu Y., MacNaughton J., Mandl F., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mizuk R., Nagamine T., Nakano E., Nakao M., Nakazawa H., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ostrowicz W., Ozaki H., Pakhlov P., Pakhlova G.

We present the results of a study of the charmless vector-vector decay B0→ωK*0 with 657×106 BB̄ pairs collected with the Belle detector at the KEKB e+e- collider. We measure the branching fraction to be B(B0→ωK*0)=[1.8±0.7(stat)±0.3(syst)]×10- 6 with 3.0σ significance. We also perform a helicity analysis of the ω and K*0 vector mesons, and obtain the longitudinal polarization fraction fL(B0→ωK*0)=0.56±0.29(stat)-0.08+0.18(syst). Finally, we measure a large nonresonant branching fraction B[B0→ω K+π-;MKπ∈(0.755,1.250)GeV/c2]=[5.1±0.7(stat)±0.7(syst)] ×10-6 with a significance of 9.5σ. © 2008 The American Physical Society.