Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Upsilon Spectrum from Lattice QCD with 2+1 Flavors of Dynamical
  Quarks   We describe the bottomonium spectrum obtained on the MILC configurations
which incorporate 2+1 flavors of dynamical quarks. We compare to quenched and 2
flavor results also on MILC configurations. We show that the lattice spacing
determination using different quantities shows clear signs of convergence with
2+1 flavors and give results for the leptonic width and hyperfine splitting, in
the form of the ratio of the 1st excited state of the Upsilon to that of the
ground state.

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The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ph
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an