We present a study of the D and B leptonic decay constants on the MILC Nf = 2+1 asqtad gauge ensembles using asqtad-improved staggered light quarks and clover heavy quarks in the Fermilab interpretation. Our previous analysis  computed the decay constants at lattice spacings a 0:14;0:11 and 0:083fm. We have extended the simulations to finer a 0:058 and 0:043fm lattice spacings, and have also increased statistics; this allows us to address many important sources of uncertainty. Technical advances include a two-step two-point fit procedure, better tuning of the heavy quark masses and a better determination of the axial-vector current matching. The present analysis remains blinded, so here we focus on the improvements and their predicted impact on the error budget compared to the prior analysis.
|Original language||English (US)|
|Journal||Proceedings of Science|
|State||Published - 2013|
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