Investigation of Semileptonic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">B</mml:mi></mml:math>Meson Decays to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">p</mml:mi></mml:math>-Wave Charm Mesons

We have studied semileptonic $B$ meson decays with a $p$-wave charm meson in the final state using $3.29\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected with the CLEO II detector at the Cornell Electron-Positron Storage Ring. We find a value for the exclusive semileptonic product branching fraction $B({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}_{1}^{0}{\ensuremath{\ell}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\ell}})B({D}_{1}^{0}\ensuremath{\rightarrow}{D}^{*+}{\ensuremath{\pi}}^{\ensuremath{-}})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(0.373\ifmmode\pm\else\textpm\fi{}0.085\ifmmode\pm\else\textpm\fi{}0.052\ifmmode\pm\else\textpm\fi{}0.024)%$ and an upper limit for $B({B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}_{2}^{*0}{\ensuremath{\ell}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\ell}})B({D}_{2}^{*0}\ensuremath{\rightarrow}{D}^{*+}{\ensuremath{\pi}}^{\ensuremath{-}})&lt;0.16%$ (90% C.L.). Furthermore, we present the first measurement of the ${q}^{2}$ spectrum for ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}_{1}^{0}{\ensuremath{\ell}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\ell}}$.