Probing displaced (dark)photons from low reheating freeze-in at the LHC
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914304252444672 |
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| author | Arias, Paola Sáez, Bastián Díaz Duarte, Lucía Jones-Pérez, Joel Rodriguez, Walter Herrera, Danilo Zegarra |
| author_facet | Arias, Paola Sáez, Bastián Díaz Duarte, Lucía Jones-Pérez, Joel Rodriguez, Walter Herrera, Danilo Zegarra |
| contents | We extend the Standard Model (SM) by introducing a $U(1)'$ gauge boson and a real pseudo-scalar field, both odd under a $\mathbb{Z}_2$ symmetry. The resulting low-energy spectrum consists of a stable vector as the dark matter candidate, and a pseudo-scalar mediator, which interacts with the SM via a Higgs portal coupling and a dimension-five portal connecting it to both the dark and visible photons. We explore the freeze-in of both particles at low reheating temperature, finding a rich yield evolution dynamics in the early Universe. This setup brings a consistent dark matter scenario in which the dark photon relic abundance is generated through freeze-in at low reheating temperatures. In addition to its cosmological viability, the model can be tested at the LHC: Higgs bosons can decay into dark photons and displaced visible photons via the long-lived mediator. These signatures allow us to constrain the Higgs portal coupling using recent searches for non-pointing photons and limits on invisible or undetected Higgs decays. We derive meaningful constraints on the dark matter parameter space, in particular excluding a thermalized mediator in the region compatible with the observed relic abundance. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_15930 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing displaced (dark)photons from low reheating freeze-in at the LHC Arias, Paola Sáez, Bastián Díaz Duarte, Lucía Jones-Pérez, Joel Rodriguez, Walter Herrera, Danilo Zegarra High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment We extend the Standard Model (SM) by introducing a $U(1)'$ gauge boson and a real pseudo-scalar field, both odd under a $\mathbb{Z}_2$ symmetry. The resulting low-energy spectrum consists of a stable vector as the dark matter candidate, and a pseudo-scalar mediator, which interacts with the SM via a Higgs portal coupling and a dimension-five portal connecting it to both the dark and visible photons. We explore the freeze-in of both particles at low reheating temperature, finding a rich yield evolution dynamics in the early Universe. This setup brings a consistent dark matter scenario in which the dark photon relic abundance is generated through freeze-in at low reheating temperatures. In addition to its cosmological viability, the model can be tested at the LHC: Higgs bosons can decay into dark photons and displaced visible photons via the long-lived mediator. These signatures allow us to constrain the Higgs portal coupling using recent searches for non-pointing photons and limits on invisible or undetected Higgs decays. We derive meaningful constraints on the dark matter parameter space, in particular excluding a thermalized mediator in the region compatible with the observed relic abundance. |
| title | Probing displaced (dark)photons from low reheating freeze-in at the LHC |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2507.15930 |