Abstract
The cross or soft anomalous dimension matrix describes the renormalization of Wilson loops with a self-intersection and is an important object in the study of infrared divergences of scattering amplitudes. In this paper it is studied for the Maldacena-Wilson loop in \( \mathcal{N}=4 \) supersymmetric Yang-Mills theory and Euclidean kinematics. We consider both the strong-coupling description in terms of minimal surfaces in AdS5 as well as the weak-coupling side up to the two-loop level. In either case, the coefficients of the cross anomalous dimension matrix can be expressed in terms of the cusp anomalous dimension. The strong-coupling description displays a Gross-Ooguri phase transition and we argue that the cross anomalous dimension is an interesting object to study in an integrability-based approach.
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Münkler, H. The cross anomalous dimension in maximally supersymmetric Yang-Mills theory. J. High Energ. Phys. 2018, 162 (2018). https://doi.org/10.1007/JHEP10(2018)162
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DOI: https://doi.org/10.1007/JHEP10(2018)162