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We present the first evidence for B semileptonic decays into the charmedbaryon Lambda_c+ based on 420 fb-1 of data collected at the Upsilon(4S)resonance with the BABAR detector at the PEP-II e+e- storage rings. Events aretagged by fully reconstructing one of the B mesons in a hadronic decay mode. Wemeasure the relative branching fraction BF(Bbar -> Lambda_c+ X l-nubar_l)/BF(Bbar -> Lambda_c+/Lambda_c- X) = (3.2 +/- 0.9_stat +/- 0.9_syst)%.The significance of the signal including the systematic uncertainty is 4.9standard deviations.

Evidence for B semileptonic decays into the charmed baryon Lambda_c+