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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Kovalenko et al. (2026) studied this question.
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