Leptonic decay constants fDs and fD in three flavor lattice QCD
Abstract
We determine the leptonic decay constants in three flavor unquenched lattice QCD. We use O(a2)-improved staggered light quarks and O(a)-improved charm quarks in the Fermilab heavy quark formalism. Our preliminary results, based upon an analysis at a single lattice spacing, are fDs = 263(+5-9)(+/-24) MeV and fD = 225(+11-13)(+/-21) MeV. In each case, the first reported error is statistical while the is the combined systematic uncertainty.
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