Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Q-cut Representation of One-loop Integrands and Unitarity Cut Method   Recently, a new construction for complete loop integrands of massless field
theories has been proposed, with on-shell tree-level amplitudes delicately
incorporated into its algorithm. This new approach reinterprets integrands in a
novel form, namely the Q-cut representation. In this paper, by deriving
one-loop integrands as examples, we elaborate in details the technique of this
new representation, e.g., the summation over all possible Q-cuts as well as
helicity states for the non-scalar internal particle in the loop. Moreover, we
show that the integrand in the Q-cut representation naturally reduces to the
integrand in the traditional unitarity cut method for each given cut channel,
providing a cross-check for the new approach.

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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph