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Measurement of the Absolute Branching Fraction of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>D</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>
We measure the absolute branching fraction for D0→K−π+ using partial reconstruction of ¯¯¯B0→D*+Xℓ−¯νℓ decays, in which only the charged lepton and the pion from the decay D*+→D0π+ are used. Based on a data sample of 230×106 B¯¯¯B pairs collected at the Υ(4S) resonance with the BABAR detector at the PEP-II …