Direct measurements of the branching fractions for inclusive K± and inclusive semileptonic decays of D+ and D0 mesons

With singly-tagged D¯ samples selected from the data collected at and around 3.773 GeV with the BESII detector at the BEPC collider, we have measured the branching fractions for the inclusive K± decays of D+ and D0 mesons, which are BF(D+→K−X)=(24.7±1.3±1.2)%, BF(D+→K+X)=(6.1±0.9±0.4)%, BF(D0→K−X)=(57.8±1.6±3.2)% and BF(D0→K+X)=(3.5±0.7±0.3)%, respectively. We have also measured the branching fractions for the inclusive semileptonic decays of D+ and D0 mesons to be BF(D+→e+X)=(15.2±0.9±0.8)% and BF(D0→e+X)=(6.3±0.7±0.4)%. These yield the ratio of their partial widths to be Γ(D+→e+X)/Γ(D0→e+X)=0.95±0.12±0.07.