Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Complex Factorisation and Recursion for One-Loop Amplitudes   We consider the factorisation of one-loop amplitudes at complex kinematic
points. By determining the terms that are absent for real kinematics, we can
construct a recursive ansatz for the purely rational pieces of one-loop
amplitudes in massless theories. We illustrate this method by verifying the
Bern et.al. n-point ansatze for the single-minus one-loop amplitudes in
Yang-Mills theory and by constructing the scalar contribution to the one-loop
five graviton MHV scattering amplitude.

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The categories of this paper are: plasm-ph
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The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex
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The categories of this paper are: math