Inclusive semileptonic decays of charm and charmed-strange mesons
نویسندگان
چکیده
We have measured the inclusive semileptonic branching fractions of D0, D+, and D+ s mesons. For these measurements, we have used the full CLEO-c open-charm data samples, 818 pb−1 at ECM = 3.774 GeV, giving D 0D̄0 and D+D− events, and 602 pb−1 at ECM = 4.170 GeV, giving D∗± s D ∓ s events. We obtain B(D0 → Xeνe) = (6.46± 0.09± 0.11)%, B(D+ → Xeνe) = (16.13± 0.10 ± 0.29)%, and B(D+ s → Xeνe) = (6.52 ± 0.39 ± 0.15)%, where the first uncertainties are statistical and the second are systematic. From these and lifetimes obtained elsewhere, we obtain the ratios of semileptonic decay widths Γ(D+ → Xeνe)/Γ(D → Xeνe) = 0.985± 0.015± 0.024 and Γ(D+ s → Xeνe)/Γ(D → Xeνe) = 0.828 ± 0.051 ± 0.025. The ratio of D+ and D0 is consistent with the isospin symmetry prediction of unity, but the ratio of D+ s and D 0 is three standard deviations from unity.
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