Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Precise Determination of the I=2 pipi Scattering Length from
  Mixed-Action Lattice QCD   The I=2 pipi scattering length is calculated in fully-dynamical lattice QCD
with domain-wall valence quarks on the asqtad-improved coarse MILC
configurations (with fourth-rooted staggered sea quarks) at four light-quark
masses. Two- and three-flavor mixed-action chiral perturbation theory at
next-to-leading order is used to perform the chiral and continuum
extrapolations. At the physical charged pion mass, we find m_pi a_pipi(I=2) =
-0.04330 +- 0.00042, where the error bar combines the statistical and
systematic uncertainties in quadrature.

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The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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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: hep-th
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The categories of this paper are: astro-ph
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex