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arxiv: hep-lat/0410030 · v1 · pith:Z4LS2H7Ynew · submitted 2004-10-20 · ✦ hep-lat

Leptonic decay constants f_Ds and f_D 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
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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
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classification ✦ hep-lat
keywords latticeconstantsdecayflavorimprovedleptonicquarksthree
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We determine the leptonic decay constants in three flavor unquenched lattice QCD. We use O(a^2)-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 f_Ds = 263(+5-9)(+/-24) MeV and f_D = 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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