Constraints on dark axion portal: missing energy and fermion EDMs
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
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2026
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| _version_ | 1866910019893592064 |
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| author | Gninenko, Sergei N. Krasnikov, N. V. Lyubovitskij, Valery E. Kuleshov, Sergey Zhevlakov, Alexey S. Voronchikhin, I. V. Kirpichnikov, D. V. |
| author_facet | Gninenko, Sergei N. Krasnikov, N. V. Lyubovitskij, Valery E. Kuleshov, Sergey Zhevlakov, Alexey S. Voronchikhin, I. V. Kirpichnikov, D. V. |
| contents | We study a model in which a new interactions between the Standard Model (SM) photon and both the dark photon ($γ_D)$ and an ALP ($a$) are described by the dark axion portal operator. The implications of this dark axion portal scenario for electron fixed-target experiments are presented. In particular, we investigate the missing energy signatures associated with production of dark photons and their subsequent invisible decays into stable dark sector fermions, $γ_D \to χ\barχ$. We discuss the discovery potential for such a scenario and derive projected sensitivity curves for the NA64$e$ and LDMX experiments. Furthermore, novel constraints of the NA64$e$ for $9.37\times 10^{11}$ electrons on target are derived by considering two production mechanisms for invisible states: (i)~the bremsstrahlung-like emission of an $aγ_D$ pair, $e N \to e N γ^* (\to a γ_D)$, and (ii)~the exclusive vector meson photoproduction, $γ^* N \to N V$, followed by the invisible decays of vector mesons, $V \to a γ_D$. Additionally, the constraints on the parameter space of $CP$-violating, fermion-specific ALP and dark photon couplings are established. These constraints are derived from current experimental bounds on the electric dipole moments (EDMs) of SM fermions, incorporating loop-induced contributions to the EDMs of the electron, muon, and neutron. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_11405 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Constraints on dark axion portal: missing energy and fermion EDMs Gninenko, Sergei N. Krasnikov, N. V. Lyubovitskij, Valery E. Kuleshov, Sergey Zhevlakov, Alexey S. Voronchikhin, I. V. Kirpichnikov, D. V. High Energy Physics - Phenomenology We study a model in which a new interactions between the Standard Model (SM) photon and both the dark photon ($γ_D)$ and an ALP ($a$) are described by the dark axion portal operator. The implications of this dark axion portal scenario for electron fixed-target experiments are presented. In particular, we investigate the missing energy signatures associated with production of dark photons and their subsequent invisible decays into stable dark sector fermions, $γ_D \to χ\barχ$. We discuss the discovery potential for such a scenario and derive projected sensitivity curves for the NA64$e$ and LDMX experiments. Furthermore, novel constraints of the NA64$e$ for $9.37\times 10^{11}$ electrons on target are derived by considering two production mechanisms for invisible states: (i)~the bremsstrahlung-like emission of an $aγ_D$ pair, $e N \to e N γ^* (\to a γ_D)$, and (ii)~the exclusive vector meson photoproduction, $γ^* N \to N V$, followed by the invisible decays of vector mesons, $V \to a γ_D$. Additionally, the constraints on the parameter space of $CP$-violating, fermion-specific ALP and dark photon couplings are established. These constraints are derived from current experimental bounds on the electric dipole moments (EDMs) of SM fermions, incorporating loop-induced contributions to the EDMs of the electron, muon, and neutron. |
| title | Constraints on dark axion portal: missing energy and fermion EDMs |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2602.11405 |