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Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mspace /><mml:mo>→</mml:mo><mml:mspace /><mml:mi mathvariant="italic">Dl</mml:mi><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow></mml:math>Partial Width and Form …
We have studied the decay ¯B→Dl¯ν, where l=e or μ. From a fit to the differential decay rate dγ/dw we measure the rate normalization FD(1)|Vcb| and form factor slope ^ρ2D, and, using measured values of τB, find γ(¯B→Dl¯ν)=(12.0±0.9±2.1)ns−1. The resulting branching fractions are B(¯B0→D+l−¯ν)=(1.87±0.15±0.32)% and B(B−→D0l−¯ν)=(1.94±0.15±0.34)%. The form factor parameters …