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
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.