Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The two-loop helicity amplitudes for $q \bar q' \to V_1 V_2 \to
  4~\mathrm{leptons}$   We compute the two-loop massless QCD corrections to the helicity amplitudes
for the production of two massive vector bosons in quark-antiquark
annihilation, allowing for an arbitrary virtuality of the vector bosons: $q
\bar q' \to V_1V_2$. Combining with the leptonic decay currents, we obtain the
full two-loop QCD description of the corresponding electroweak four-lepton
production processes. The calculation is performed by projecting the two-loop
diagrams onto an appropriate basis of Lorentz structures. All two-loop Feynman
integrals are reduced to a basis of master integrals, which are then computed
using the differential equations method and optimised for numerical
performance. We provide a public C++ code which allows for fast and precise
numerical evaluations of the amplitudes.

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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: cond-mat
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg