Evidence for B semileptonic decays into the charmed baryon Lambdac+
Abstract
We present the first evidence for B semileptonic decays into the charmed baryon Lambdac+ 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 are tagged by fully reconstructing one of the B mesons in a hadronic decay mode. We measure the relative branching fraction BF(Bbar -> Lambdac+ X l- nubarl)/BF(Bbar -> Lambdac+/Lambdac- X) = (3.2 +/- 0.9stat +/- 0.9syst)%. The significance of the signal including the systematic uncertainty is 4.9 standard deviations.
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