The infrared R* - operation

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S. Larin , P. van Nieuwenhuizen This is my paper · ORCID

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keywords infrareddescribediagramsdivergenciesfeynmanoperationr-operationsubtraction

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We describe the infrared R-operation for subtraction of infrared divergencies in Feynman diagrams

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On divergences in a four-derivative scalar field theory
hep-th 2026-08 conditional novelty 8.0 of 10

The renormalisation of a four-derivative scalar theory is computed to three loops, IR finiteness and non-renormalisation theorems are proven, and the perfect-square theory's beta function is shown to agree with O(2) p...