Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Update: Precision D_s decay constant from full lattice QCD using very
  fine lattices   We update our previous determination of both the decay constant and the mass
of the $D_s$ meson using the Highly Improved Staggered Quark formalism. We
include additional results at two finer values of the lattice spacing along
with improved determinations of the lattice spacing and improved tuning of the
charm and strange quark masses. We obtain $m_{D_s}$ = 1.9691(32) GeV, in good
agreement with experiment, and $f_{D_s}$ = 0.2480(25) GeV. Our result for
$f_{D_s}$ is 1.6$\sigma$ lower than the most recent experimental average
determined from the $D_s$ leptonic decay rate and using $V_{cs}$ from CKM
unitarity. Combining our $f_{D_s}$ with the experimental rate we obtain a
direct determination of $V_{cs} = 1.010(22)$, or alternatively $0.990 {+0.013
\atop -0.016}$ using a probability distribution for statistical errors for this
quantity which vanishes above 1. We also include an accurate prediction of the
decay constant of the $\eta_c$, $f_{\eta_c}$ = 0.3947(24) GeV, as a calibration
point for other lattice calculations.

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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: math
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The categories of this paper are: q-bio