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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2006, vol. 74, p. -

Observation of B+→Ξ̄c0Λc+ and evidence for B0→Ξ̄c-Λc+

Chistov R., Abe K., Adachi I., Aihara H., Anipko D., Arinstein K., Asano Y., Aulchenko V., Aushev T., Bahinipati S., Bakich A. M., Balagura V., Bedny I., Bitenc U., Bizjak I., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chao Y., Chen A., Chen W. T., Cheon B. G., Choi S. K., Choi Y., Choi Y. K., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Epifanov D., Fratina S., Gabyshev N., Garmash A., Gershon T., Go A., Golob B., Gorišek A., Ha H. C., Haba J., Hayasaka K., Hayashii H., Hazumi M., Hokuue T., Hoshi Y., Hou S., Hou W. S., Iijima T., Ishikawa A., Iwasaki M., Iwasaki Y., Kapusta P., Katayama N., Kawasaki T., Khan H. R., Kichimi H., Kim H. J., Kim S. M., Kinoshita K., Korpar S., Krokovny P., Kulasiri R., Kuo C. C., Kuzmin A., Kwon Y. J., Leder G., Lesiak T., Lin S. W., Liventsev D., MacNaughton J., Majumder G., Mandl F., Matsumoto T., Mitaroff W., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Mueller J., Nagasaka Y., Nakano E., Nakao M., Nishida S., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Onuki Y., Ostrowicz W., Ozaki H., Pakhlov P., Palka H.

We report the first observation of the decay B+→Ξ̄c0Λc+ with a significance of 8.7σ and evidence for the decay B0→Ξ̄c-Λc+ with a significance of 3.8σ. The product B(B+→Ξ̄c0Λc+)×B(Ξ̄c0→Ξ̄+π-) is measured to be (4.8-0.9+1.0±1.1±1.2)×10-5, and B(B0→Ξ̄c-Λc+)×B(Ξ̄c-→Ξ̄+π- π-) is measured to be (9.3-2.8+3.7±1.9±2.4)×10-5. The errors are statistical, systematic and the error of the Λc+→pK-π+ branching fraction, respectively. The decay B+→Ξ̄c0Λc+ is the first example of a two-body exclusive B+ decay into two charmed baryons. The data used for this analysis was accumulated at the Υ(4S) resonance, using the Belle detector at the e+e- asymmetric-energy collider KEKB. The integrated luminosity of the data sample is equal to 357fb-1, corresponding to 386×106 BB̄ pairs. © 2006 The American Physical Society.