Measurement of the Branching Fractions of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mover accent="true"><mml:mi>B</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mo>→</mml:mo><mml:msup><mml:mi>D</mml:mi><mml:mo>**</mml:mo></mml:msup><mml:msup><mml:mi>ℓ</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msub><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>ℓ</mml:mi></mml:msub></mml:math>Decays in Events Tagged by a Fully Reconstructed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>Meson

We report a measurement of the branching fractions of $\overline{B}\ensuremath{\rightarrow}{D}^{**}{\ensuremath{\ell}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\ell}}$ decays based on $417\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected at the $\mathit{\ensuremath{\Upsilon}}(4S)$ resonance with the BABAR detector at the PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ 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 $m({D}^{(*)}\ensuremath{\pi})\ensuremath{-}m({D}^{(*)})$ is performed to extract the signal yields of the different ${D}^{**}$ states. We observe the $\overline{B}\ensuremath{\rightarrow}{D}^{**}{\ensuremath{\ell}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\ell}}$ decay modes corresponding to the four ${D}^{**}$ states predicted by heavy quark symmetry with a significance greater than 5 standard deviations including systematic uncertainties.

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