Three loop cusp anomalous dimension in QCD.

@article{Grozin2015ThreeLC,
  title={Three loop cusp anomalous dimension in QCD.},
  author={A. Grozin and J. Henn and G. Korchemsky and P. Marquard},
  journal={Physical review letters},
  year={2015},
  volume={114 6},
  pages={
          062006
        }
}
We present the full analytic result for the three loop angle-dependent cusp anomalous dimension in QCD. With this result, infrared divergences of planar scattering processes with massive particles can be predicted to that order. Moreover, we define a closely related quantity in terms of an effective coupling defined by the lightlike cusp anomalous dimension. We find evidence that this quantity is universal for any gauge theory and use this observation to predict the nonplanar n(f)-dependent… Expand
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Figures from this paper

Four-loop results for the cusp anomalous dimension
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Heavy quark form factors at two loops
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Asymptotic behavior of the heavy quark form factors at higher order
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