Exploring sub-GeV dark matter via $s$-wave, $p$-wave, and resonance annihilation with CMB data
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866914017748975616 |
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| author | Wang, Yu-Ning Duan, Xin-Chen Tang, Tian-Peng Wang, Ziwei Tsai, Yue-Lin Sming |
| author_facet | Wang, Yu-Ning Duan, Xin-Chen Tang, Tian-Peng Wang, Ziwei Tsai, Yue-Lin Sming |
| contents | We revisit constraints on sub-GeV dark matter (DM) annihilation via $s$-wave, $p$-wave, and resonance processes using current and future CMB data from Planck, FIRAS, and upcoming experiments such as LiteBIRD, CMB-S4, PRISTINE, and PIXIE. For $s$-wave annihilation, we provide updated limits for both $e^{+}e^{-}$ and $ππ$ channels, with the profile likelihood method yielding stronger constraints than the marginal posterior method. In the $p$-wave case, we comprehensively present a model-independent inequality for the $95\%$ upper limits from FIRAS, PRISTINE, and PIXIE, with future experiments expected to surpass current BBN limits. For resonance annihilation, we report -- for the first time -- the $95\%$ upper limits on the decay branching ratio of the mediator particle, when the resonance peaks during the recombination epoch. Overall, our study highlights the complementary strengths of $μ$-distortion and CMB anisotropies in probing sub-GeV DM annihilation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_18263 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exploring sub-GeV dark matter via $s$-wave, $p$-wave, and resonance annihilation with CMB data Wang, Yu-Ning Duan, Xin-Chen Tang, Tian-Peng Wang, Ziwei Tsai, Yue-Lin Sming High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We revisit constraints on sub-GeV dark matter (DM) annihilation via $s$-wave, $p$-wave, and resonance processes using current and future CMB data from Planck, FIRAS, and upcoming experiments such as LiteBIRD, CMB-S4, PRISTINE, and PIXIE. For $s$-wave annihilation, we provide updated limits for both $e^{+}e^{-}$ and $ππ$ channels, with the profile likelihood method yielding stronger constraints than the marginal posterior method. In the $p$-wave case, we comprehensively present a model-independent inequality for the $95\%$ upper limits from FIRAS, PRISTINE, and PIXIE, with future experiments expected to surpass current BBN limits. For resonance annihilation, we report -- for the first time -- the $95\%$ upper limits on the decay branching ratio of the mediator particle, when the resonance peaks during the recombination epoch. Overall, our study highlights the complementary strengths of $μ$-distortion and CMB anisotropies in probing sub-GeV DM annihilation. |
| title | Exploring sub-GeV dark matter via $s$-wave, $p$-wave, and resonance annihilation with CMB data |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2502.18263 |