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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2006, vol. 73, p. -

Measurement of branching fraction and direct CP asymmetry in B0→ρ0π0 decays

Dragic J., Abe K., Abe K., Adachi I., Aihara H., Anipko D., Asano Y., Aushev T., Bahinipati S., Bakich A. M., Balagura V., Barbero M., Bay A., Bedny I., 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 Y., Choi Y. K., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Gabyshev N., Garmash A., Gershon T., Go A., Gokhroo G., Golob B., Goriek A., Ha H. C., Haba J., Hara T., Hastings N. C., Hayasaka K., Hayashii H., Hazumi M., Hinz L., 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., Jacoby C., 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., Krian P., Krokovny P., Kulasiri R., Kuo C. C., Kusaka A., Kuzmin A., Kwon Y. J., Leder G., Lee J., Lesiak T., Li J., Limosani A., Lin S. W., Liventsev D., MacNaughton J., Mandl F., Marlow D., Matsumoto T., Mikami Y.

We report a measurement of the branching fraction of the decay B0→ρ0π0, using 386×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We detect 51-13+14 signal events with a significance of 4.2 standard deviations, including systematic uncertainties, and measure the branching fraction to be B(B0→ρ0π0)=(3.12-0.82+0.88(stat)±0.33(syst)-0. 68+0.50(model))×10-6. We also perform the first measurement of direct CP violating asymmetry in this mode. © 2006 The American Physical Society.