Four-loop results for the cusp anomalous dimension
October 02, 2018
We review the current status of calculations
of the HQET field anomalous dimension and the cusp anomalous dimension.
In particular, we give the results at 4 loops for the quartic Casimir contribution,
and for the full QED case, up to $\varphi^6$ in the small angle expansion.
Furthermore, we discuss the leading terms in the anti-parallel lines limit at four loops.
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