Abstract
We solve renormalization group equations that govern infrared divergences of massless and massive form factors. By comparing to recent results for planar massive three-loop and massless four-loop form factors in QCD, we give predictions for the high-energy limit of massive form factors at the four- and for the massless form factor at five-loop order. Furthermore, we discuss the relation which connects infrared divergences regularized dimensionally and via a small quark mass and extend results present in the literature to higher order.
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Ahmed, T., Henn, J.M. & Steinhauser, M. High energy behaviour of form factors. J. High Energ. Phys. 2017, 125 (2017). https://doi.org/10.1007/JHEP06(2017)125
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DOI: https://doi.org/10.1007/JHEP06(2017)125