Leptonic decay constants fDs and fD in three flavor lattice QCD
J. N. Simone, C. Aubin, C. Bernard, C. DeTar, M. di Pierro, A. X. El-Khadra, Steven Gottlieb, E. B. Gregory, U. M. Heller, J. E. Hetrick, A. S. Kronfeld, P. B. Mackenzie, D. P. Menscher, M. Nobes, M. Okamoto, M. B. Oktay, J. Osborn, R. Sugar, D. Toussaint, H. D. Trottier, :, The Fermilab Lattice, MILC, HPQCD Collaborations
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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