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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2007, vol. 76, p. -

Study of B̄0→D0π+π- decays

Kuzmin A., Abe K., Adachi I., Aihara H., Anipko D., Arinstein K., Aulchenko V., Aushev T., Bahinipati S., Bakich A. M., Balagura V., Barberio E., Barbero M., Bay A., Bedny I., Belous K., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Browder T. E., Chang M. C., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi Y., Choi Y. K., Dalseno J., Dash M., Drutskoy A., Eidelman S., Epifanov D., Gabyshev N., Garmash A., Gershon T., Go A., Gokhroo G., Golob B., Ha H., Haba J., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Iijima T., Ikado K., Imoto A., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kapusta P., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim Y. J., Kinoshita K., Križan P., Krokovny P., Kulasiri R., Kumar R., Kuo C. C., Kwon Y. J., Lee S. E., Lesiak T., Lin S. W., Majumder G., Mandl F., Matsumoto T., McOnie S., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Nagasaka Y., Nakano E., Nakao M., Natkaniec Z.

We report the results of a study of neutral B meson decays to the D0π+π- final state, where the D0 is fully reconstructed. The results are obtained from an event sample containing 388×106 BB̄-meson pairs collected in the Belle experiment at the KEKB e+e- collider. The total branching fraction of the three-body decay B(B̄0→D0π+π-)=(8.4±0. 4(stat)±0.8(syst))×10-4 has been measured. The intermediate resonant structure of these three-body decays has been studied. From a Dalitz plot analysis we have obtained the product of the branching fractions for D2*+ and D0*+ production: B(B̄0→D2*+π-) ×B(D2*+→D0π+)=(2.15±0.17(stat)±0.29(syst) ±0.12(mod))×10-4, and B(B̄0→D0*+π-) ×B(D0*+→D0π+)=(0.60±0.13(stat)±0.15(syst) ±0.22(mod))×10-4. This is the first observation of the B̄0→D0*+π- decay. The B̄0→D0ρ0 and D0f2 branching fractions are measured to be: B(B̄0→D0ρ0)=(3. 19±0.20(stat)±0.24(syst)±0.38(mod))×10-4, and B(B̄0→D0f2)=(1.20±0.18(stat)±0.21(syst)±0.32(mod) )×10-4. © 2007 The American Physical Society.