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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, vol. 77, p. -

Study of B̄→ΞcΛ̄c- and B̄→Λ c+Λ̄c-K̄ decays at BABAR

Aubert B., Bona M., Boutigny D., Karyotakis Y., Lees J. P., Poireau V., Prudent X., Tisserand V., Zghiche A., Tico J. Garra, Grauges E., Lopez L., Palano A., Pappagallo M., Eigen G., Stugu B., Sun L., Abrams G. S., Battaglia M., Brown D. N., Button-Shafer J., Cahn R. N., Groysman Y., Jacobsen R. G., Kadyk J. A., Kerth L. T., Kolomensky Yu G., Kukartsev G., Pegna D. Lopes, Lynch G., Mir L. M., Orimoto T. J., Osipenkov I. L., Ronan M. T., Tackmann K., Tanabe T., Wenzel W. A., Del Amo Sanchez P., Hawkes C. M., Watson A. T., Koch H., Schroeder T., Walker D., Asgeirsson D. J., Cuhadar-Donszelmann T., Fulsom B. G., Hearty C., Mattison T. S., McKenna J. A., Barrett M., Khan A., Saleem M., Teodorescu L., Blinov V. E., Bukin A. D., Druzhinin V. P., Golubev V. B., Onuchin A. P., Serednyakov S. I., Skovpen Yu I., Solodov E. P., Todyshev K. Yu, Bondioli M., Curry S., Eschrich I., Kirkby D., Lankford A. J., Lund P., Mandelkern M., Martin E. C., Stoker D. P., Abachi S., Buchanan C., Foulkes S. D., Gary J. W., Liu F., Long O., Shen B. C., Vitug G. M., Zhang L., Paar H. P., Rahatlou S., Sharma V., Berryhill J. W., Campagnari C., Cunha A., Dahmes B., Hong T. M., Kovalskyi D., Richman J. D., Beck T. W., Eisner A. M., Flacco C. J., Heusch C. A., Kroseberg J., Lockman W. S., Schalk T., Schumm B. A., Seiden A., Wilson M. G.

We report measurements of B-meson decays into two- and three-body final states containing two charmed baryons using a sample of 230×106 Υ(4S)→BB̄ decays. We find significant signals in two modes, measuring branching fractions B(B-→Λc+Λ̄c-K-)=(1. 14±0.15±0.17±0.60)×10-3 and B(B- →Ξc0Λ̄c-)×B(Ξc0→Ξ-π+)=(2.08±0. 65±0.29±0.54)×10-5, where the uncertainties are statistical, systematic, and from the branching fraction B(Λc+→pK-π+), respectively. We also set upper limits at the 90% confidence level on two other modes: B(B̄0→Ξc+Λ̄c-)×B(Ξc+→Ξ- π+π+)<5.6×10-5 and B(B̄0→Λc+Λ̄c- K̄0)<1.5×10-3. We observe structure centered at an invariant mass of 2.93GeV/c2 in the Λc+K- mass distribution of the decay B-→Λc+Λ̄c-K-. © 2008 The American Physical Society.