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We have studied semileptonic $B$ meson decays with a P-wave charm meson inthe final state using 3.29 x 10^6 B\bar{B} events collected by the CLEO~IIdetector at the Cornell Electron-positron Storage Ring. We find a value for theexclusive semileptonic product branching fraction: Br(B^- -> D_1^0 l^-\bar{\nu}) x Br(D_1^0 -> D^{*+}\pi^-) = (0.373 \pm 0.085 \pm 0.052 \pm 0.024)%and an upper limit for Br(B^- -> D_2^{*0} l^- \bar{\nu}) x Br(D_2^{*0} ->D^{*+}\pi^-) < 0.16%$ (90% C.L.). These results indicate that at least 20% ofthe total B^- semileptonic rate is unaccounted for by the observed exclusivedecays, B^- -> D^0 l^- \bar{\nu}, B^- -> D^{*0} l^- \bar{\nu}, B^- -> D_1^0 l^-\bar{\nu}, and B^- -> D_2^{*0} l^- \bar{\nu}.

physical review letters

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

Investigation of SemileptonicBMeson Decays top-Wave Charm Mesons