Abstract
We find a new duality for form factors of lightlike Wilson loops in planar \( \mathcal{N} \) = 4 super-Yang-Mills theory. The duality maps a form factor involving an n-sided lightlike polygonal super-Wilson loop together with m external on-shell states, to the same type of object but with the edges of the Wilson loop and the external states swapping roles. This relation can essentially be seen graphically in Lorentz harmonic chiral (LHC) superspace where it is equivalent to planar graph duality. However there are some crucial subtleties with the cancellation of spurious poles due to gauge fixing. They are resolved by finding the correct formulation of the Wilson loop and by careful analytic continuation from Minkowski to Euclidean space. We illustrate all of these subtleties explicitly in the simplest non-trivial NMHV-like case.
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Chicherin, D., Heslop, P., Korchemsky, G.P. et al. Wilson loop form factors: a new duality. J. High Energ. Phys. 2018, 29 (2018). https://doi.org/10.1007/JHEP04(2018)029
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DOI: https://doi.org/10.1007/JHEP04(2018)029