Observation of the decay B0bar -> LambdaC antiproton pi0

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In a sample of 467 million B B pairs collected with the BABAR detector at the PEP-II collider at SLAC we have observed the decay B⁰→Λc+ p π⁰ and measured the branching fraction to be (1.94±0.17 ± 0.14 ± 0.50)× 10⁻⁴, where the uncertainties are statistical, systematic, and the uncertainty on the Λc+→ p K- π+ branching fraction, respectively. We determine an upper limit of 1.5× 10⁻⁶ at 90% C.L. for the product branching fraction B (B⁰→ Σc+(2455) p)× B (Λc+→ p K- π+). Furthermore, we observe an enhancement at the threshold of the invariant mass of the baryon-antibaryon pair.