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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2003, vol. 553, p. 159-166

Study of B0 → D(*)0π+π- decays

Satpathy A., Abe K., Abe R., Abe T., Adachi I., Aihara H., Akatsu M., Asano Y., Aso T., Aushev T., Bakich A. M., Ban Y., Bay A., Bedny I., Behera P. K., Bondar A., Bozek A., Bračko M., Browder T. E., Casey B. C K, Chang P., Chao Y., Chen K. F., Cheon B. G., Chistov R., Choi S. K., Choi Y., Danilov M., Dong L. Y., Eidelman S., Eiges V., Fukunaga C., Gabyshev N., Garmash A., Gershon T., Golob B., Haba J., Hara T., Hastings N. C., Hayashii H., Hazumi M., Higuchi I., Hinz L., Hokuue T., Hou W. S., Huang H. C., Igaki T., Igarashi Y., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki H., Iwasaki Y., Jang H. K., Kang J. H., Kapusta P., Kataoka S. U., Katayama N., Kawai H., Kawakami Y., Kawamura N., Kawasaki T., Kichimi T., Kim D. W., Kim H. J., Kim Hyunwoo, Kim S. K., Kinoshita K., Kobayashi S., Krokovny P., Kulasiri R., Kumar S., Kuzmin A., Kwon Y. J., Lee S. H., Li J., Liventsev D., Lu R. S., MacNaughton J., Majumder G., Mandl F., Matsumoto S., Matsumoto T., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Mori T., Nagamine T., Nagasaka Y., Nakadaira T., Nakano E., Nakao M., Nakazawa H., Nam J. W.

We report on a study of B 0 → D(*)0 π+π- decays using 29.1 fb-1 of e+e- annihilation data recorded at the γ(4S) resonance with the Belle detector at the KEKB storage ring. Making no assumptions about the intermediate mechanism, the branching fractions for B 0 → D0π+π- and B 0 → D*+π+π- are determined to be (8.0 ± 0.6 ± 1.5) x 10-4 and (6.2 ± 1.2 ± 1.8) × 10-4, respectively. An analysis of B 0 → D0π+π- candidates yields to the first observation of the color-suppressed hadronic decay B 0 → D0ρ0 with the branching fraction (2.9 ± 1.0 ± 0.4) × 10-4. We measure the ratio of branching fractions Β(B 0 → D0ρ0)/Β(B 0 → D0ω) = 1.6 ± 0.8. © 2002 Elsevier Science B.V. All rights reserved.