Measurement of the hadronic structure of semileptonicD0andD+decays

Abstract

Absolute branching fractions for the ${\mathit{D}}_{\mathit{l}3}$ and ${\mathit{D}}_{\mathit{l}4}$ decays ${\mathit{D}}^{+}$→K¯ ${}_{}{}^0{}_{}{}^{}$ ${\mathit{e}}^{+}$ ${\nu }_{\mathit{e}}$,${\mathit{D}}^{+}$→K¯ ${}_{}{}^0{}_{}{}^{}\mathrm{\mu }_{}^{+}{}_{}{}^{}$ ${\nu }_{\mathrm{\mu }}$, ${\mathit{D}}^{+}$→K¯ ${}_{}{}^{\mathrm{*}0}{}_{}{}^{}$ ${\mathit{e}}^{+}$ ${\nu }_{\mathit{e}}$, and ${\mathit{D}}^0$→${\mathit{K}}^{\mathrm{*}\mathrm{-}}$ ${\mathit{e}}^{+}$ ${\nu }_{\mathit{e}}$ are determined using completely reconstructed DD¯ events at the ψ(3770). Reconstructed ${\mathit{D}}^0$→${\mathit{K}}^{\mathrm{-}}$ ${\mathit{e}}^{+}$ ${\nu }_{\mathit{e}}$ decays are used to determine the pole mass of the ${\mathit{f}}_4$(${\mathit{q}}^2$) form factor. Resonant ${\mathit{K}}^{\mathrm{*}}$ production dominates the process D→Kπeν; the ${\mathit{K}}^{\mathrm{*}}$ polarization is measured. Limits on several Cabibbo-suppressed channels are evaluated. A global fit imposing isospin symmetry is performed to the measured exclusive and inclusive semileptonic ${\mathit{D}}^0$ and ${\mathit{D}}^{+}$ branching fractions to obtain an improved set of branching fractions.