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Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mover accent="true"><mml:mi>B</mml:mi><mml:mo stretchy="true">¯</mml:mo></mml:mover><mml:mn>0</mml:mn></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>D</mml:mi><mml:mrow><mml:mo>*</mml:mo><mml:mo>+</mml:mo></mml:mrow></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 stretchy="true">¯</mml:mo></mml:mover><mml:mi>ℓ…
We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| based on a sample of about 53 700 B¯0→D*+ℓ−ν¯ℓ decays observed by the BABAR detector. We obtain the branching fraction averaged over ℓ=e,μ, B(B¯0→D*+ℓ−ν¯ℓ)=(4.90±0.07(stat.)−0.35+0.36(syst.))%. We measure the differential decay rate as a function of w, the relativistic boost γ of …