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We investigate the decays $D^0\to\pi^-\ell^+\nu$ and $D^0\to K^-\ell^+ \nu$,where $\ell$ is $e$ or $\mu$, using approximately 7 ${\rm fb}^{-1}$ of datacollected with the CLEO III detector. We find $R_0\equiv {\cal B}(D^0\to\pi^-e^+\nu)/{\cal B}(D^0\to K^-e^+\nu)= 0.082 \pm 0.006 \pm 0.005$. Fits tothe kinematic distributions of the data provide parameters describing the formfactor of each mode. Combining the form factor results and $R_0$ gives$|f^{\pi}_{+}(0)|^2 |V_{cd}|^2/|f^K_{+}(0)|^2 |V_{cs}|^2 =0.038^{+0.006+0.005}_{-0.007-0.003}$.Comment: 5 pages, 2 figures, talk given at DPF'04, UC Riverside, C

Precision Measurements of the Semileptonic Charm Decays D0 → π-ℓ+ν and D0 → K-ℓ+ν

Precision Measurements of the Semileptonic Charm Decays D⁰ → π^-ℓ⁺ν and D⁰ → K^-ℓ⁺ν