Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The hadronic vacuum polarization of the muon from four-flavor lattice
  QCD   We present an update on the ongoing calculations by the Fermilab Lattice,
HPQCD, and MILC Collaboration of the leading-order (in electromagnetism)
hadronic vacuum polarization contribution to the anomalous magnetic moment of
the muon. Our project employs ensembles with four flavors of highly improved
staggered fermions, physical light-quark masses, and four lattice spacings
ranging from $a \approx 0.06$ to 0.15 fm for most of the results thus far.

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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: cond-mat
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: astro-ph