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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, vol. 77, p. -

Measurement of CP asymmetries and branching fractions in a time-dependent Dalitz analysis of B0→(ρπ)0 and a constraint on the quark mixing angle 2

Kusaka A., Wang C. C., Adachi I., Aihara H., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Balagura V., Barberio E., Bedny I., Belous K., Bitenc U., Bondar A., Bozek A., Bračko M., Browder T. E., Chang P., Chao Y., Chen A., Chen W. T., Cheon B. G., Chistov R., Cho I. S., Choi S. K., Choi Y., Dalseno J., Dash M., Eidelman S., Gabyshev N., Golob B., Haba J., Hara K., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kah D. H., Kang J. H., Kawai H., Kawasaki T., Kichimi H., Kim H. O., Kim S. K., Kim Y. J., Kinoshita K., Korpar S., Križan P., Krokovny P., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee J. S., Lee M. J., Lee S. E., Lesiak T., Limosani A., Lin S. W., Liu Y., Liventsev D., Mandl F., Matyja A., McOnie S., Medvedeva T., Miyabayashi K., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Nakano E., Nakao M., Nishida S., Nitoh O., Noguchi S., Nozaki T., Ogawa S., Ohshima T., Okuno S., Ozaki H., Pakhlova G., Park C. W., Park H., Peak L. S.

We present the results of a time-dependent Dalitz plot analysis of B0→π+π-π0 decays based on a 414fb-1 data sample that contains 449×106BB̄ pairs. The data were collected on the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. Combining our analysis with information on charged B decay modes, we perform a full Dalitz and isospin analysis and obtain a constraint on the quark mixing angle 2, 68°< 2<95° at the 68.3% confidence level for the 2 solution consistent with the standard model. A large standard-model-disfavored region also remains. The branching fractions for the decay processes B0→ρ±(770)π and B0→ρ0(770)π0 are measured to be (22.6±1.1[stat]±4.4[syst])×10-6 and (3.0±0.5[stat] ±0.7[syst])×10-6, respectively. These are the first branching fraction measurements of the process B0→ρ(770)π with the lowest resonance ρ(770) explicitly separated from the radial excitations. © 2008 The American Physical Society.