Charmed meson decay constants in three-flavor lattice QCD
C. Aubin, C. Bernard, C. DeTar, M. Di Pierro, E. D. Freeland, Steven Gottlieb, U. M. Heller, J. E. Hetrick, A. X. El-Khadra, A. S. Kronfeld, L. Levkova, P. B. Mackenzie, D. Menscher, F. Maresca, M. Nobes, M. Okamoto, D. Renner, J. Simone, R. Sugar, D. Toussaint, H. D. Trottier
Abstract
We present the first lattice QCD calculation with realistic sea quark content of the D+ meson decay constant fD+. 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 fD+ = 201 +/- 3 +/- 17 MeV, where the errors are statistical and a combination of systematic errors. We also obtain fDs = 249 +/- 3 +/- 16 MeV for the Ds meson.
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