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Charmed-meson decay constants in three-flavor lattice QCD. 2005
C Aubin, and
C Bernard, and
C Detar, and
M Di Pierro, and
E D Freeland, and
Steven Gottlieb, and
U M Heller, and
J E Hetrick, and
A X El-Khadra, and
A S Kronfeld, and
L Levkova, and
P B Mackenzie, and
D Menscher, and
F Maresca, and
M Nobes, and
M Okamoto, and
D Renner, and
J Simone, and
R Sugar, and
D Toussaint, and
H D Trottier, and
, and
, and
Physics Department, Columbia University, New York, New York 10027, USA.
We present the first lattice QCD calculation with realistic sea quark content of the D+-meson decay constant f(D+). We use the MILC Collaboration's publicly available ensembles of lattice gauge fields, which have a quark sea with two flavors (up and down) much lighter than a third (strange). We obtain f(D+)=201+/-3+/-17 MeV, where the errors are statistical and a combination of systematic errors. We also obtain f(Ds)=249+/-3+/-16 MeV for the Ds meson.
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