By combining experimentally measured partial branching fractions for the semileptonic decays D→K and D→ with lattice calculations of the formfactors f D→K + (q2) and f D→ + (q2), one can extract the CKM matrix elements |Vcs| and |Vcd|. We are calculating the form factors by using Fermilab charm and asqtad staggered light and strange quarks on 2+1 flavor asqtad staggered ensembles generated by the MILC Collaboration. We vary the light valence quark masses from 0.4ms to 0.05ms (ms is the strange sea-quark mass), and the lattice spacings, from about 0.12 fm to about 0.045 fm. We extrapolate to the physical light-quark mass and the continuum limit using heavy-light meson staggered chiral perturbation theory about the SU(2) and SU(3) limits, compare the resulting (preliminary) form factor shapes with experiment, and discuss our errors.
|Original language||English (US)|
|Journal||Proceedings of Science|
|State||Published - 2012|
|Event||30th International Symposium on Lattice Field Theory, Lattice 2012 - Cairns, Australia|
Duration: Jun 24 2012 → Jun 29 2012
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