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We compute the fermionic contribution to the photon-quark form factor tofour-loop order in QCD in the planar limit in analytic form. From the divergentpart of the latter the cusp and collinear anomalous dimensions are extracted.Results are also presented for the finite contribution. We briefly describe ourmethod to compute all planar master integrals at four-loop order.

A planar four-loop form factor and cusp anomalous dimension in QCD