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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2004, vol. 599, p. 148-158

Observation of the decays B0 → K+π -π0 and B0 → ρ-K +

Chang P., Abe K., Abe K., Abe T., Aihara H., Asano Y., Aulchenko V., Aushev T., Aziz T., Bahinipati S., Bakich A. M., Ban Y., Bay A., Bedny I., Bitenc U., Bizjak I., Bondar A., Bozek A., Bracko M., Brodzicka J., Browder T. E., Chang M. C., Chao Y., Cheon B. G., Chistov R., Choi S. K., Choi Y., Cole S., Danilov M., Dash M., Dong L. Y., Drutskoy A., Eidelman S., Eiges V., Enari Y., Fang F., Fratina S., Gabyshev N., Garmash A., Gershon T., Gokhroo G., Golob B., Guo R., Hastings N. C., Hayashii H., Hazumi M., Higuchi T., Hinz L., Hokuue T., Hoshi Y., Hou W. S., Hsiung Y. B., Huang H. C., Inami K., Ishikawa A., Itoh R., Iwasaki H., Iwasaki M., Iwasaki Y., Kang J. H., Kang J. S., Kataoka S. U., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim H. J., Kim J. H., Kim S. K., Kim T. H., Koppenburg P., Korpar S., Križan P., Krokovny P., Kuzmin A., Kwon Y. J., Lee S. E., Lesiak T., Li J., Lin S. W., MacNaughton J., Majumder G., Mandl F., Marlow D., Matsumoto T., Matyja A., Mitaroff W., Miyake H., Miyata H., Mizuk R., Mohapatra D., Mori T., Nagamine T., Nagasaka Y.

We report the observation of B0 decays to the K+π-π0 final state using a data sample of 78 fb-1 collected by the Belle detector at the KEKB e+e- collider. With no assumptions about intermediate states in the decay, the branching fraction is measured to be (36.6-4.3+4.2±3.0)×10-6. We also search for B decays to intermediate two-body states with the same K+π-π0 final state. Significant B signals are observed in the ρ(770)-K+ and K*(892)+π- channels, with branching fractions of (15.1-3.3-1.5-2.1+3.4+1.4+2.0)×10-6 and (14.8-4.4-1.0-0.9+4.6+1.5+2.4) ×10-6, respectively. The first error is statistical, the second is systematic and the third is due to the largest possible interference. Contributions from other possible two-body states will be discussed. No CP asymmetry is found in the inclusive K+π-π0 or ρ-K+ modes, and we set 90% confidence level bounds on the asymmetry of -0.12<ACP<0.26 and -0.18<ACP<0.64, respectively. © 2004 Elsevier B.V. All rights reserved.