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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2006, vol. 97, p. -

Observation of B+→Λc+Λc-K+ and B0→Λ c+Λc-K0 Decays

Gabyshev N., Abe K., Abe K., Adachi I., Aihara H., Asano Y., Aulchenko V., Aushev T., Bahinipati S., Bakich A. M., Balagura V., Barberio E., Bartel W., Bay A., Bedny I., Bitenc U., Bizjak I., Bondar A., Bozek A., Bračko M., Browder T. E., Chen A., Chen W. T., Cheon B. G., Chistov R., Choi Y., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Garmash A., Gershon T., Gokhroo G., Golob B., Haba J., Hayasaka K., Hayashii H., Hazumi M., Hokuue T., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Ikado K., Imoto A., Inami K., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kawasaki T., Khan H. R., Kichimi H., Kim S. M., Korpar S., Krokovny P., Kulasiri R., Kuo C. C., Kuzmin A., Kwon Y. J., Leder G., Lesiak T., Lin S. W., Liventsev D., Majumder G., Matsumoto T., Mitaroff W., Miyabayashi K., Miyata H., Miyazaki Y., Mizuk R., Nakano E., Nakao M., Natkaniec Z., Nishida S., Ogawa S., Ohshima T., Okabe T., Okuno S., Olsen S. L., Ozaki H., Palka H., Park C. W., Park K. S., Pestotnik R., Piilonen L. E., Sakai Y., Sato N., Satoyama N., Schietinger T., Schneider O., Schwanda C., Seidl R.

We report the first measurements of the doubly charmed baryonic B decays B→Λc+Λc-K. The B+→Λc+Λc-K+ decay is observed with a branching fraction of (6.5-0.9+1.0±1.1±3.4) ×10-4 and a statistical significance of 15.4σ. The B0→Λc+Λc-K0 decay is observed with a branching fraction of (7.9-2.3+2.9±1.2±4.1)×10-4 and a statistical significance of 6.6σ. The branching fraction errors are statistical, systematic, and the error resulting from the uncertainty of the Λc+→pK-π+ decay branching fraction. The analysis is based on 357fb-1 of data accumulated at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. © 2006 The American Physical Society.