Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Dimensional Regularization of QCD Helicity Amplitudes With Quarks   We study QCD helicity amplitudes with an arbitrary number of (massive)
quarks, keeping unobserved (loop) particles in fixed integer $D_s$ dimensions.
We find a suitable embedding of external four-dimensional fermion states into
higher dimensional spaces. This allows to identify the $D_s$ dependence of
amplitudes with external quarks at one and two loops, permitting an analytic
continuation in $D_s$. Explicitly we focus on 't Hooft-Veltman and
four-dimensional helicity schemes for which we provide a compact prescription
for the computation of one- and two-loop amplitudes amenable for numerical
implementation.

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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: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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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: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg