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arXiv · 2307.15498

From tree- to loop-simplicity in affine Toda theories II: higher-order poles and cut decompositions

Patrick Dorey·Davide Polvara
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Abstract

Recently we showed how, in two-dimensional scalar theories, one-loop threshold diagrams can be cut into the product of one or more tree-level diagrams arXiv:2206.09368. Using this method on the ADE series of Toda models, we computed the double- and single-pole coefficients of the Laurent expansion of the S-matrix around a pole of arbitrary even order, finding agreement with the bootstrapped results. Here we generalise the cut method explained in arXiv:2206.09368 to multiple loops and use it to simplify large networks of singular diagrams. We observe that only a small number of cut diagrams survive and contribute to the expected bootstrapped result, while most of them cancel each other out through a mechanism inherited from the tree-level integrability of these models. The simplification mechanism between cut diagrams inside networks is reminiscent of Gauss's theorem in the space of Feynman diagrams.

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Patrick Dorey, Davide Polvara. 2023-07-28. From tree- to loop-simplicity in affine Toda theories II: higher-order poles and cut decompositions. https://arxiv.org/abs/2307.15498

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