Abstract
Results of a study of the exclusive semileptonic decay modes D0→K−e+νe and D+→K−π+e+νe are presented. We have measured their branching fractions relative to those of dominant hadronic modes, BF(D0→K−e+νe)/BF(D0→K−π+)=0.91±0.07 ±0.11 and BF(D+→K*e+νe)/BF(D+→K−π+π+) =0.53±0.05±0.06. The non‐resonant Kπ component in the D+→Kπeν decay mode was found to be small. Combining our results with measurements with the D0 lifetime and a branching fraction for the mode D0→K−π+ we find ‖Vcs‖2≡f+(0)‖2=0.50±0.07±0.08. We have observed signals for decays D+s and D+→π−π+π+. We have analysed these modes for the fraction due to ρ0π+ and f0(975)π+ and measured their relative branching fractions. Also, we present limits on flavour‐changing neutral current decays D0→e+e− and D0→μe.
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