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We search for the doubly charmed baryonic decay$\bar{B}^0\to\Lambda_c^+\bar{\Lambda}_c^-$, in a data sample of $520\times10^6$$B{\bar B}$ events accumulated at the $\Upsilon(4S)$ resonance with the Belledetector at the KEKB asymmetric e^+e^- collider. We find no significant signaland set an upper limit of ${\calB}(\bar{B}^0\to\Lambda_c^+\bar{\Lambda}_c^-)<6.2\times10^{-5}$ at 90%confidence level. The result is significantly below a naive extrapolation from${\cal B}(B^-\to\Xi_c^0\bar{\Lambda}_c^)$ assuming a simple Cabibbo-suppressionfactor of $|V_{cd}/V_{cs}|^2$. The small branching fraction could be attributedto a suppression due to the large momentum of the baryonic decay products,which has been observed in other charmed baryonic two-body B decays. trendobserved in other charmed baryonic two-body B decays.

Search for \bar{B}^0\to\Lambda_c^+\bar{\Lambda}_c^- decay at Belle