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The Three-loop MHV Octagon from $\bar{Q}$ equations

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arxiv 2110.00350 v1 pith:LRGPTMBL submitted 2021-10-01 hep-th

classification hep-th
keywords amplitudeequationslettersalgebraicoctagonpointsymboltheory
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

The $\bar{Q}$ equations, rooted in the dual superconformal anomalies, are a powerful tool for computing amplitudes in planar $\mathcal{N}=4$ supersymmetric Yang-Mills theory. By using the $\bar{Q}$ equations, we compute the symbol of the first MHV amplitude with algebraic letters -- the three-loop 8-point amplitude (or the octagon remainder function) -- in this theory. The symbol alphabet for this amplitude consists of 204 independent rational letters and shares the same 18 algebraic letters with the two-loop 8-point NMHV amplitude.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Cluster Algebras, Cube Roots, and Energy Correlators in $\mathcal{N}=4$ SYM

    hep-th 2026-08 conditional novelty 7.0 of 10

    Infinite mutation sequences of the cluster quiver Q3 generate the six cubic algebraic symbol letters of the near-collinear four-point energy correlator in N=4 super-Yang-Mills theory.

  2. Double spacelike collinear limits from multi-Regge kinematics

    hep-th 2025-07 conditional novelty 7.0 of 10

    The double spacelike collinear limit of planar N=4 SYM is governed by a generalized splitting amplitude that equals the six-point BDS-subtracted amplitude in multi-Regge kinematics.

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