Measurement of the Branching Fractions of Bbar -> D** l- nubarl Decays in Events Tagged by a Fully Reconstructed B Meson
Abstract
We report a measurement of the branching fractions of Bbar -> D** l- nubarl decays based on 417 fb-1 of data collected at the Upsilon(4S) resonance with the BaBar detector at the PEP-II e+e- storage rings. Events are selected by fully reconstructing one of the B mesons in a hadronic decay mode. A fit to the invariant mass differences m(D(*)pi)-m(D(*)) is performed to extract the signal yields of the different D** states. We observe the Bbar -> D** l- nubarl decay modes corresponding to the four D** states predicted by Heavy Quark Symmetry with a significance greater than six standard deviations including systematic uncertainties.
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