Effective Field Theory Perspective On King Non-linearity Article Swipe

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Benoît Assi , Sam Carey , Sebastian Jäger , Gilad Pérez ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2512.03157

Precision spectroscopic measurements of isotope shifts have recently reached a high level of accuracy. Tests of King non-linearity (NL) along isotope chains have been proposed as a tool to search for fifth-force mediators. At the same time, these tests can potentially teach us about the structure of heavy nuclei at unprecedented precision, where King NL has already been observed in several systems. A robust interpretation of the existing data, however, is hampered by incomplete control over the Standard Model (SM) contributions. We develop a systematic effective field theory framework, matching the SM onto scalar non-relativistic QED in the infinite nuclear mass limit and then onto quantum-mechanical potentials. This approach organizes all nuclear effects into a small set of Wilson coefficients and cleanly separates short- and long-distance physics. We show that the commonly used treatment of the $\langle r^2\rangle^2$ term needs to be reconsidered, as it arises only at second-order in perturbation theory, and we derive the long-range $1/r^4$ potential from nuclear polarizability. Applying the framework to hydrogen-like systems, we provide a transparent classification of SM sources of King NL relevant for current and future isotope-shift experiments. The formalism can be applied to learn about the shape of the heavy scalar nuclei at a higher level of precision and detail than what was previously attainable.

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Type: preprint
Landing Page: http://arxiv.org/abs/2512.03157
PDF: https://arxiv.org/pdf/2512.03157
OA Status: green
OpenAlex ID: https://openalex.org/W4417025141

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DOI: https://doi.org/10.48550/arxiv.2512.03157

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Title: Effective Field Theory Perspective On King Non-linearity

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Type: preprint

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Publication year: 2025

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Publication date: 2025-12-02

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Authors: Benoît Assi, Sam Carey, Sebastian Jäger, Gilad Pérez

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Landing page: https://arxiv.org/abs/2512.03157

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