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We present a measurement of the B0 --> Lambda-bar p pi- branching fractionperformed using the BaBar detector at the PEP-II asymmetric e+e- collider.Based on a sample of 467 million BB-bar pairs we measure B(B0 --> Lambda-bar ppi-) = [3.07 pm 0.31 (stat.) pm 0.23 (syst.)] x 10^{-6}. The measureddifferential spectrum as a function of the dibaryon invariant mass m(Lambda p)shows a near-threshold enhancement similar to that observed in other baryonic Bdecays. We study the Lambda-bar polarization as a function of Lambda-bar energyin the B0 rest frame (E*_Lambda) and compare it with theoretical expectationsof fully longitudinally right-polarized Lambda-bar at large E*_Lambda.

Measurement of the Branching Fraction and Lambda-bar Polarization in B0 -> Lambda-bar p pi-