Reviving $Z$ and Higgs Mediated Dark Matter Models in Matter Dominated Freeze-out
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| Format: | Preprint |
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2019
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| _version_ | 1866917061739937792 |
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| author | Chanda, Prolay Hamdan, Saleh Unwin, James |
| author_facet | Chanda, Prolay Hamdan, Saleh Unwin, James |
| contents | It is quite conceivable that dark matter freeze-out occurred during an early period of matter domination, in which case the evolution and relic abundance differ from standard freeze-out calculations which assume a radiation dominated universe. Here we re-examine the classic models in which dark matter interactions with the Standard Model are mediated via either the Higgs or $Z$ boson in the context of matter dominated freeze-out. We highlight that while these classic models are largely excluded by searches in the radiation dominated case, matter dominated freeze-out can relax these limits and thus revive the Higgs and $Z$ portals. Additionally, we discuss the distinctions between matter dominated freeze-out and decoupling during the transition from matter domination to radiation domination, and we comment on the parameter regimes which lead to non-negligible dark matter production during this transition. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_1911_02616 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | Reviving $Z$ and Higgs Mediated Dark Matter Models in Matter Dominated Freeze-out Chanda, Prolay Hamdan, Saleh Unwin, James High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics It is quite conceivable that dark matter freeze-out occurred during an early period of matter domination, in which case the evolution and relic abundance differ from standard freeze-out calculations which assume a radiation dominated universe. Here we re-examine the classic models in which dark matter interactions with the Standard Model are mediated via either the Higgs or $Z$ boson in the context of matter dominated freeze-out. We highlight that while these classic models are largely excluded by searches in the radiation dominated case, matter dominated freeze-out can relax these limits and thus revive the Higgs and $Z$ portals. Additionally, we discuss the distinctions between matter dominated freeze-out and decoupling during the transition from matter domination to radiation domination, and we comment on the parameter regimes which lead to non-negligible dark matter production during this transition. |
| title | Reviving $Z$ and Higgs Mediated Dark Matter Models in Matter Dominated Freeze-out |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/1911.02616 |