Precision computation of the leptonic Ds-meson decay constant in quenched QCD
Andreas Juttner, Juri Rolf
Abstract
We summarize a computation of the leptonic decay constant fDs of the Ds-meson in quenched QCD on the lattice. We perform a direct simulation at the masses of the strange and the charm quarks at four different lattice spacings from approximately 0.1 fm to 0.05 fm. Fully non perturbative O(a)-improvement is employed. After taking the continuum limit we arrive at a value of fDs=252(9) MeV, when setting the scale with the Kaon decay constant fK=160 MeV. Setting the scale with the nucleon mass instead leads to a decrease of about 20 MeV of fDs.
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