Production of doubly charmed baryons in B decays

We study the doubly charmed baryonic B decays $B\to {\mathrm{\Xi }}_c{\mathrm{\Lambda }}_c$ and $B\to {\mathrm{\Lambda }}_c^{+}{\mathrm{\Lambda }}_c^{-}K$, recently observed by BELLE. We find that the unexpected large branching ratios (BRs) could be ascribed to the final state interactions (FSIs), which are dictated by $B\to DD^{+}{s}\to \Xi{c} \Lambda^{+}{c}$and$B\to \bar D^0 D^{0} K\to \Lambda^{+}{c} \Lambda^{-}{c} K$\mathrm{.}Byutilizingthesamemechanism,wepredictthattheBRsfor$B^{+}\to \bar \Xi^{0}{c} \Sigma^{+}{c}$and$B^{+} \to \Sigma^{\mp}{c} \Lambda^{\pm}{c} K^{+}$decayscouldbeaslargeas$BR(B^{+}\to \bar\Xi^{0}{c} \Lambda^{+}_{c})$and$10^{-4}$, respectively. In addition, extending the FSIs to the processes associated with the creation of the $s\bar{s}$ pair, $BR(B^{+}\to {\bar{\mathrm{\Omega }}}_c{\mathrm{\Xi }}_c^{+})$ at percent level is achievable.