Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Form factor recursion relations at loop level   We introduce a prescription to define form factor integrands at loop level in
planar $\mathcal{N}=4$ supersymmetric Yang-Mills theory. This relies on a
periodic kinematic configuration that has been instrumental to describe form
factors at strong coupling in terms of periodic Wilson loops. With this
prescription, we are able to formulate loop-level recursion relations for
planar form factor integrands, using a two-line (BCFW) and an all-line shift.
We also point out important differences with the known recursion relations of
integrands of planar loop amplitudes. We present a number of concrete one-loop
examples to illustrate and validate our prescription for form factor
integrands.

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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: physics
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin