Study of $\bar{{B}}\rightarrow\Xi_c \bar{\Lambda}_c^-$ and $\bar{{B}}\rightarrow\Lambda_c^+\bar{\Lambda}_c^-\bar{{K}}$ decays at BABAR
B. Aubert \fIet al.\fP

We report measurements of $B$-meson decays into two- and three-body final states containing two charmed baryons using a sample of 230 million \upsbb decays. We find significant signals in two modes, measuring branching fractions $\BR(\BmtoLcLcKm) = (1.14 \pm 0.15 \pm 0.17 \pm 0.60)\times10^{-3}$ and $\BR(\BmtoXiczLc)\times \BR(\XcztoXipi) = (2.08 \pm 0.65 \pm 0.29 \pm 0.54)\times10^{-5}$, where the uncertainties are statistical, systematic, and from the branching fraction $\BR(\Lctopkpi)$, respectively. We also set upper limits at the 90\% confidence level on two other modes: $\BR(\Bzb\to\Xi_c^+\aLc)\times\BR(\Xi_c^+\to\Xi^-\pi^+\pi^+) &lt 5.6\times 10^{-5}$ and $\BR(\Bzb\to\Lc\aLc\Kzb) &lt 1.5 \times 10^{-3}$. We observe structure centered at an invariant mass of 2.93~GeV$/c^2$ in the $\Lc K^-$ mass distribution of the decay \BmtoLcLcKm.

© 2008 The American Physical Society.