The $n_f^2$ contributions to fermionic four-loop form factors

Abstract

We compute the four-loop contributions to the photon quark and Higgs quark form factors involving two closed fermion loops. We present analytical results for all non-planar master integrals of the two non-planar integral families which enter our calculation.

26 pages

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• Singlet and non-singlet three-loop massive form factors
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