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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2006, vol. 96, p. -

Measurement of the branching fraction, polarization, and CP asymmetry for B0→ρ+ρ- Decays, and determination of the cabibbo-kobayashi-maskawa phase 2

Somov A., Schwartz A. J., Abe K., Abe K., Adachi I., Aihara H., Anipko D., Arinstein K., Asano Y., Aulchenko V., Aushev T., Aziz T., Bahinipati S., Bakich A. M., Balagura V., Bay A., Bedny I., Belous K., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang M. C., Chang P., Chao Y., Chen A., Chen W. T., Cheon B. G., Chistov R., Choi S. K., Choi Y., Choi Y. K., Chuvikov A., Cole S., Dalseno J., Dash M., Dragic J., Drutskoy A., Eidelman S., Epifanov D., Gabyshev N., Garmash A., Gershon T., Go A., Gokhroo G., Golob B., Hara K., Hara T., Hastings N. C., Hayasaka K., Hayashii H., Hazumi M., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Iijima T., Ikado K., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kapusta P., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim S. K., Kim S. M., Kinoshita K., Korpar S., Križan P., Krokovny P., Kuo C. C., Kusaka A., Kuzmin A., Kwon Y. J., Leder G., Lesiak T., Li J., Limosani A., Lin S. W., MacNaughton J., Mandl F., Marlow D., Matsumoto T., Mitaroff W.

We have measured the branching fraction B, longitudinal polarization fraction fL, and CP asymmetry coefficients A and S for B0→ρ+ρ- decays with the Belle detector at the KEKB e+e- collider using 253fb-1 of data. We obtain B=[22.8±3.8(stat)-2.6+2.3(syst)]×10-6, fL=0.941-0.040+0.034(stat)±0.030(syst), A=0.00±0.30(stat) ±0.09(syst), and S=0.08±0.41(stat)±0.09(syst). These values are used to constrain the Cabibbo-Kobayashi-Maskawa phase 2; the solution consistent with the standard model is 2=(88±17)° or 59°< 2<115° at 90% C.L. © 2006 The American Physical Society.