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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2005, vol. 72, p. -

Observation of B-→J/ψΛp̄ and searches for B-→J/ψΣ0p̄ and B0→J/ψpp̄ decays

Xie Q. L., Abe K., Abe K., Adachi I., Aihara H., Asano Y., Aushev T., Bahinipati S., Bakich A. M., Barberio E., Barbero M., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chao Y., Chen A., Chen W. T., Cheon B. G., Chistov R., Choi Y., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Dong L. Y., Drutskoy A., Eidelman S., Enari Y., Fratina S., Gabyshev N., Gershon T., Go A., Gokhroo G., Golob B., Gorišek A., Haba J., Hayasaka K., Hayashii H., Hazumi M., Hinz L., Hokuue T., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Iijima T., Ikado K., Imoto A., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kang J. S., Kapusta P., Kataoka S. U., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim J. H., Kim S. M., Kinoshita K., Krokovny P., Kuo C. C., Kwon Y. J., Leder G., Lee S. E., Lesiak T., Li J., Liventsev D., Mandl F., Matsumoto T., Matyja A., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Nagamine T., Nagasaka Y., Nakano E., Natkaniec Z., Nishida S., Nitoh O., Nozaki T.

We report the observation of B-→J/ψΛp̄ and searches for B-→J/ψΣ0p̄ and B0→J/ψpp̄ decays, using a sample of 275×106 BB̄ pairs collected with the Belle detector at the Υ(4S) resonance. We observe a signal of 17.2±4.1 events with a significance of 11.1σ and obtain a branching fraction of B(B-→J/ψΛp̄)=11.6±2.8(stat)-2.3+1.8(sys)×10-6. No signal is found for either of the two decay modes, B-→J/ ψΣ0p̄ and B0→J/ψpp̄, and upper limits for the branching fractions are determined to be B(B-→J/ψΣ0p̄)<1. 1×10-5 and B(B0→J/ψpp̄)<8.3×10-7 at 90% confidence level. © 2005 The American Physical Society.