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By combining experimentally measured partial branching fractions for thesemileptonic decays D to K l nu and D to pi l nu with lattice calculations ofthe form factors f_+^{D to K}(q^2) and f_+^{D to pi}(q^2), one can extract theCKM matrix elements |V_{cs}| and |V_{cd}|. We are calculating the form factorsby using Fermilab charm and asqtad staggered light and strange quarks on 2+1flavor asqtad staggered ensembles generated by the MILC Collaboration. We varythe light valence quark masses from 0.4m_s to 0.05m_s (m_s is the strangesea-quark mass), and the lattice spacings, from about 0.12 fm to about 0.045fm. We extrapolate to the physical light-quark mass and the continuum limitusing heavy-light meson staggered chiral perturbation theory about the SU(2)and SU(3) limits, compare the resulting (preliminary) form factor shapes withexperiment, and discuss our errors.

Charm semileptonic decays and |V_{cs(d)}| from heavy clover quarks and 2+1 flavor asqtad staggered ensembles