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arXiv · 2510.25841

Electroweak form factors of large nuclei as BPS skyrmions

Alberte Xosé López Freire·Christoph Adam·Alberto García Martín-Caro·Diego González Díaz
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Abstract

We employ the Bogomolnyi-Prasad-Sommerfield (BPS) Skyrme model within the framework of semi-classical quantization as an effective model to compute both the electromagnetic and neutral current form factors for heavy nuclei. Our results show excellent agreement with the experimental data for low- to moderate momentum transfer. Further, we present an analytic expression of the neutral current form factor for generic nuclei, expressed as a power series in the momentum transfer. Our method provides an alternative to existing phenomenological approaches which, after fitting just one global radial parameter, allows for a surprisingly precise determination of the electroweak form factors at low momentum transfer for all heavy nuclei. Such a simple and robust description is particularly relevant for precision neutrino experiments, because it allows for a certain control over model-dependent systematics, which is essential for probing physics beyond the Standard Model.

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Alberte Xosé López Freire, Christoph Adam, Alberto García Martín-Caro, Diego González Díaz. 2026-07-30. Electroweak form factors of large nuclei as BPS skyrmions. https://arxiv.org/abs/2510.25841

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