Abstract
We study the threshold corrections for inclusive deep-inelastic scattering (DIS) and their all-order resummation. Using recent results for the QCD form factor, related anomalous dimensions and Mellin moments of DIS structure functions at four loops we derive the complete soft and collinear contributions to the DIS Wilson coefficients at four loops. For a general SU(nc) gauge group the results are exact in the large-nc approximation and for QCD with nc = 3 we present precise approximations. We extend the threshold resummation exponent GN in Mellin-N space to the fifth logarithmic (N4LL) order collecting the terms {alpha}_{mathrm{s}}^3 (αs ln N)n to all orders in the strong coupling constant αs. We study the numerical effect of the N4LL corrections using both the fully exponentiated form and the expansion of the coefficient function in towers of logarithms. As a byproduct, we derive a numerical result for the complete pole structure of the QCD form factor in the parameter of dimensional regularization ε at four loops.
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