Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Precise Predictions for Z + 4 Jets at Hadron Colliders   We present the cross section for production of a Z boson in association with
four jets at the Large Hadron Collider, at next-to-leading order in the QCD
coupling. When the Z decays to neutrinos, this process is a key irreducible
background to many searches for new physics. Its computation has been made
feasible through the development of the on-shell approach to perturbative
quantum field theory. We present the total cross section for pp collisions at
sqrt{s} = 7 TeV, after folding in the decay of the Z boson, or virtual photon,
to a charged-lepton pair. We also provide distributions of the transverse
momenta of the four jets, and we compare cross sections and distributions to
the corresponding ones for the production of a W boson with accompanying jets.

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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn