Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lattice Calculations of Decay Constants   Lattice attempts to compute the leptonic decay constants of heavy-light
pseudoscalar mesons are described. I give a short historical overview of such
attempts and then discuss some current calculations. I focus on three of the
most important sources of systematic error: the extrapolation to the continuum,
the chiral extrapolation in light quark mass, and the effects of quenching. I
briefly discuss the ``bag parameters'' $B_B$ and $B_{B_s}$, and then conclude
with my expectations of the precision in decay constants and bag parameters
that will be possible in the next few years.

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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-th
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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: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: q-alg