Illuminating sequential freeze-in dark matter with dark photon signal at the CERN SHiP experiment
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915917034684416 |
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| author | Yin, Xinyue Zheng, Sibo |
| author_facet | Yin, Xinyue Zheng, Sibo |
| contents | Single-field freeze-in dark matter barely leaves observable footprints in dark matter direct detection, collider or fixed-target experiments, which can be altered in the two-field context. In this work, we consider sequential freeze-in dark matter through signals of dark photon mediator with a mass range of $m_{A'}\sim 10^{-2}-10$ GeV covered by the proposed SHiP experiment. We show that the dark charge is fixed to be $e'\sim 1.3\times 10^{-12}$ and the mixing parameter is restricted to $10^{-11}\leq ε< 10^{-8}-10^{-7.5}$, as a result of the out-of-equilibrium condition of dark photon and the observed relic abundance of dark matter. Within this $ε$ region, the 5(15)-year data of proton bremsstrahlung process for the dark photon, assuming vector meson (dipole) dominance, excludes $ε\geq 10^{-8.5} (10^{-7.9})$ at 90\% confidence level, implying only a narrow region of $ε$ close to $\sim 10^{-11}$ left for alternative tests. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_05380 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Illuminating sequential freeze-in dark matter with dark photon signal at the CERN SHiP experiment Yin, Xinyue Zheng, Sibo High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment Single-field freeze-in dark matter barely leaves observable footprints in dark matter direct detection, collider or fixed-target experiments, which can be altered in the two-field context. In this work, we consider sequential freeze-in dark matter through signals of dark photon mediator with a mass range of $m_{A'}\sim 10^{-2}-10$ GeV covered by the proposed SHiP experiment. We show that the dark charge is fixed to be $e'\sim 1.3\times 10^{-12}$ and the mixing parameter is restricted to $10^{-11}\leq ε< 10^{-8}-10^{-7.5}$, as a result of the out-of-equilibrium condition of dark photon and the observed relic abundance of dark matter. Within this $ε$ region, the 5(15)-year data of proton bremsstrahlung process for the dark photon, assuming vector meson (dipole) dominance, excludes $ε\geq 10^{-8.5} (10^{-7.9})$ at 90\% confidence level, implying only a narrow region of $ε$ close to $\sim 10^{-11}$ left for alternative tests. |
| title | Illuminating sequential freeze-in dark matter with dark photon signal at the CERN SHiP experiment |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2512.05380 |