A Dark Sink Enhances the Direct Detection of Freeze-in Dark Matter
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| author | Bhattiprolu, Prudhvi N. McGehee, Robert Pierce, Aaron |
| author_facet | Bhattiprolu, Prudhvi N. McGehee, Robert Pierce, Aaron |
| contents | We describe a simple dark sector structure which, if present, has implications for the direct detection of dark matter (DM): the Dark Sink. A Dark Sink transports energy density from the DM into light dark-sector states that do not appreciably contribute to the DM density. As an example, we consider a light, neutral fermion $ψ$ which interacts solely with DM $χ$ via the exchange of a heavy scalar $Φ$. We illustrate the impact of a Dark Sink by adding one to a DM freeze-in model in which $χ$ couples to a light dark photon $γ'$ which kinetically mixes with the Standard Model (SM) photon. This freeze-in model (absent the sink) is itself a benchmark for ongoing experiments. In some cases, the literature for this benchmark has contained errors; we correct the predictions and provide them as a public code. We then analyze how the Dark Sink modifies this benchmark, solving coupled Boltzmann equations for the dark-sector energy density and DM yield. We check the contribution of the Dark Sink $ψ$'s to dark radiation; consistency with existing data limits the maximum attainable cross section. For DM with a mass between $\text{MeV} -\mathcal{O}(10\text{ GeV})$, adding the Dark Sink can increase predictions for the direct detection cross section all the way up to the current limits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_14152 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | A Dark Sink Enhances the Direct Detection of Freeze-in Dark Matter Bhattiprolu, Prudhvi N. McGehee, Robert Pierce, Aaron High Energy Physics - Phenomenology High Energy Physics - Experiment We describe a simple dark sector structure which, if present, has implications for the direct detection of dark matter (DM): the Dark Sink. A Dark Sink transports energy density from the DM into light dark-sector states that do not appreciably contribute to the DM density. As an example, we consider a light, neutral fermion $ψ$ which interacts solely with DM $χ$ via the exchange of a heavy scalar $Φ$. We illustrate the impact of a Dark Sink by adding one to a DM freeze-in model in which $χ$ couples to a light dark photon $γ'$ which kinetically mixes with the Standard Model (SM) photon. This freeze-in model (absent the sink) is itself a benchmark for ongoing experiments. In some cases, the literature for this benchmark has contained errors; we correct the predictions and provide them as a public code. We then analyze how the Dark Sink modifies this benchmark, solving coupled Boltzmann equations for the dark-sector energy density and DM yield. We check the contribution of the Dark Sink $ψ$'s to dark radiation; consistency with existing data limits the maximum attainable cross section. For DM with a mass between $\text{MeV} -\mathcal{O}(10\text{ GeV})$, adding the Dark Sink can increase predictions for the direct detection cross section all the way up to the current limits. |
| title | A Dark Sink Enhances the Direct Detection of Freeze-in Dark Matter |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2312.14152 |