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Nonlocal portal to the dark sector

Sergey Kovalenko1,2, Sergey Kuleshov1,2, Valery E. Lyubovitskij3,1, and Alexey S. Zhevlakov4,5

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Phys. Rev. D 114, 014025 – Published 10 July, 2026

DOI: https://doi.org/10.1103/xqyc-6vgs

Abstract

We propose a nonlocal realization of the Stueckelberg portal between the Standard Model and dark sector, which decouple in the local limit. This implies that the mediator, U(1)D dark photon A′ with a Stueckelberg mass, interacts nonlocally with the Standard Model quarks and leptons. We study phenomenological implications of this scenario for the meson decays into semi-invisible and invisible channels. We discuss the experimental limitations on the model parameters, including the nonlocality scale.

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Phys. Rev. D 114, 014025– Published 10 July, 2026
  • Received 30 March 2026
  • Accepted 29 May 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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