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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2007, vol. 76, p. -

Observation of the decay B̄0→Ds+Λp̄

Medvedeva T., Chistov R., Abe K., Abe K., Adachi I., Aihara H., Anipko D., Aushev T., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bitenc U., Bizjak I., 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., Choi Y., Choi Y. K., Cole S., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Fratina S., Gabyshev N., Garmash A., Gershon T., Go A., Golob B., Ha H., Haba J., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou S., Hou W. S., Iijima T., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim Y. J., Krokovny P., Kulasiri R., Kumar R., Kuo C. C., Kwon Y. J., Leder G., Lee M. J., Lee S. E., Lesiak T., Lin S. W., Liventsev D., Majumder G., Mandl F., Matsumoto T., McOnie S., Mitaroff W., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Mori T., Nagasaka Y., Nakao M., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Onuki Y., Ozaki H., Pakhlov P.

We report the first observation of the decay B̄0→Ds+Λ p̄ with a statistical significance of 6.6σ. We measure B(B̄0→Ds+Λp̄)=(2.9±0.7±0.5±0.4) ×10-5, where the first error is statistical, the second is systematic, and the third error comes from the uncertainty in B(Ds+→π+). The data used for this analysis was accumulated at the Υ(4S) resonance, using the Belle detector at the KEKB asymmetric-energy e+e- collider. The integrated luminosity of the data sample is 414fb-1, corresponding to 449×106 BB̄ pairs. © 2007 The American Physical Society.