We determine the leptonic decay constants fDs and fD in three flavor unquenched lattice QCD. We use O(a2)-improved sraggered 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 = 263-9+5 ± 24 MeV and fD = 225-13+11 ± 21 MeV. In each case, the first reported error is statistical while the second is the combined systematic uncertainty.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics