The Ds and D+ Leptonic Decay Constants from Lattice QCD

Details The Ds and D+ Leptonic Decay Constants from Lattice QCD The Ds and D+ Leptonic Decay Constants from Lattice QCD

2009-12-28

arxiv.org/abs/0912.5221v1

PoS LAT2009:249,2009

Physics

High Energy Physics

High Energy Physics - Lattice

contribution to LATTICE 2009

Scientific paper

We present the leptonic decay constants fDs and fD+ computed on the MILC collaboration's 2+1 flavor asqtad gauge ensembles. We use clover heavy quarks with the Fermilab interpretation and improved staggered light quarks. The simultaneous chiral and continuum extrapolation, which determines both decay constants, includes partially-quenched lattice results at lattice spacings a ~ 0:09, 0:12 and 0:15 fm. We have made several recent improvements in our analysis: a) we include terms in the fit describing leading order heavy-quark discretization effects, b) we have adopted a more precise input r1 value consistent with our other D and B meson studies, c) we have retuned the input bare charm masses based upon the new r1. Our preliminary results are fDs = 260 +/-10 MeV and fD+ = 217 +/-10 MeV.

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