Observation of the baryonic B-decay B0bar -> Lambdac+ antiproton K- pi+
Abstract
We report the observation of the baryonic B-decay B0bar -> Lambdac+ antiproton K- pi+, excluding contributions from the decay B0bar -> Lambdac+ anti-Lambda K-. Using a data sample of 467*106 BBbar pairs collected with the BABAR detector at the PEP-II storage ring at SLAC, the measured branching fraction is (4.33 +/- 0.82stat +/- 0.33syst +/- 1.13Lambdac+)*10-5. In addition we find evidence for the resonant decay B0bar -> Sigmac(2455)++ antiproton K- and determine its branching fraction to be (1.11 +/- 0.30stat +/- 0.09syst +/- 0.29Lambdac+)*10-5. The errors are statistical, systematic, and due to the uncertainty in the Lambdac+ branching fraction. For the resonant decay B0bar -> Lambdac+ antiproton K*0 we obtain an upper limit of 2.42*10-5 at 90% confidence level.