Renormalization of effective field theories via on-shell methods: the case of axion-like particles
arXiv:2412.04160 · doi:10.1007/JHEP10(2025)190
Abstract
We consider the most general axion-like particle effective field theory, including both CP-odd and CP-even types of interactions, and evaluate the corresponding renormalization group equations, improving and extending previous results in the literature. Our calculations exploit on-shell and unitarity-based methods. The relevant phase-space cut-integrals are carried out using different integration methods, among which the double-cut integration via Stokes' theorem proves to be technically simpler. A close comparison between the standard Feynman diagrammatic approach and the unitarity-based method enables us to explicitly verify the reduction of complexity in the latter case, along with a more direct and elegant way to establish a connection among anomalous dimensions of operators that are dual under the CP symmetry.
arXiv comment49 pages, 22 figures. Published version on JHEP. Text improved. Running above the electroweak scale added
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