Garra Ticó, JordiGraugés Pous, EugeniBABAR Collaboration2019-09-062019-09-062008-12-230031-9007https://hdl.handle.net/2445/139435We report a measurement of the branching fractions of ¯¯¯ B → D ** ℓ − ¯ ν ℓ decays based on 417     fb − 1 of data collected at the Υ ( 4 S ) 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 ( * ) π ) − m ( D ( * ) ) is performed to extract the signal yields of the different D ** states. We observe the ¯¯¯ B → D ** ℓ − ¯ ν ℓ decay modes corresponding to the four D ** states predicted by heavy quark symmetry with a significance greater than 5 standard deviations including systematic uncertainties.7 p.application/pdfeng(c) American Physical Society, 2008Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article5776662019-09-06info:eu-repo/semantics/openAccess