Two-loop six-gluon maximally helicity violating amplitude in maximally supersymmetric Yang-Mills theory
- 11 August 2008
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 78 (4), 045007
- https://doi.org/10.1103/physrevd.78.045007
Abstract
We give a representation of the parity-even part of the planar two-loop six-gluon maximally helicity violating (MHV) amplitude of super-Yang-Mills theory, in terms of loop-momentum integrals with simple dual conformal properties. We evaluate the integrals numerically in order to test directly the Anastasiou-Bern-Dixon-Kosower/Bern-Dixon-Smirnov all-loop ansatz for planar MHV amplitudes. We find that the ansatz requires an additive remainder function, in accord with previous indications from strong-coupling and Regge limits. The planar six-gluon amplitude can also be compared with the hexagonal Wilson loop computed by Drummond, Henn, Korchemsky, and Sokatchev in arXiv:0803.1466. After accounting for differing singularities and other constants independent of the kinematics, we find that the Wilson loop and MHV-amplitude remainders are identical, to within our numerical precision. This result provides nontrivial confirmation of a proposed -point equivalence between Wilson loops and planar MHV amplitudes, and suggests that an additional mechanism besides dual conformal symmetry fixes their form at six points and beyond.
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