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Measurements of the branching fractions <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="script">B</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:msup><mml:mover accent="true"><mml:mi>B</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:mn>0</mml:mn></mml:msup><mml:mo stretchy="false">→</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>π</mml:mi><mml:mo>−</mml:mo></mml…
Using (771.6±10.6)×106 B¯B meson pairs recorded by the Belle experiment at the KEKB e+e− collider, we report the branching fractions B(¯B0→D*+π−)=(2.62±0.02±0.09)×10−3 and B(¯B0→D*+K−)=(2.22±0.06±0.08)×10−4; the quoted uncertainties are statistical and systematic, respectively. A measurement of the ratio of these branching fractions is also presented, RK/π=B(¯B→D*+K−)/B(¯B→D*+π−)=(8.41±0.24±0.13)×10−2, where systematic uncertainties due to the …