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 φ6 in the small angle expansion. Furthermore, we discuss the leading terms in the anti-parallel lines limit at four loops.
@article{arxiv.1807.05145,
title = {Four-loop results for the cusp anomalous dimension},
author = {R. Brüser and A. G. Grozin and J. M. Henn and M. Stahlhofen},
journal= {arXiv preprint arXiv:1807.05145},
year = {2018}
}
Comments
Talk at Loops and Legs 2018, 9 pages; v2: a more detailed comment on Casimir scaling and 3 references added