Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-loop helicity amplitudes for fermion-fermion scattering   We discuss the calculation of two-loop helicity amplitudes for quark-quark
scattering in QCD and four-gluino scattering in N=1 supersymmetric Yang-Mills
theory. We study the dependence of the results on different variants of
dimensional regularization. In particular, we consider the 't Hooft-Veltman and
four-dimensional helicity (FDH) schemes. We also discuss ambiguities in
continuing the Dirac algebra to D dimensions. For the four-gluino case, once
the infrared divergent part of the amplitude is subtracted, the finite
remainder is free of these ambiguities.

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The categories of this paper are: hep-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess