Singlet-doublet fermion dark matter with Dirac neutrino mass, $(g-2)_μ$ and $ΔN_{\rm eff}$
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866913319407845376 |
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| author | Borah, Debasish Mahapatra, Satyabrata Nanda, Dibyendu Sahoo, Sujit Kumar Sahu, Narendra |
| author_facet | Borah, Debasish Mahapatra, Satyabrata Nanda, Dibyendu Sahoo, Sujit Kumar Sahu, Narendra |
| contents | We study the possibility of generating light Dirac neutrino mass via scotogenic mechanism where singlet-doublet fermion dark matter (DM) plays non-trivial role in generating one-loop neutrino mass, anomalous magnetic moment of muon $(g-2)_μ$ as well as additional relativistic degrees of freedom $Δ{N_{\rm eff}}$ within reach of cosmic microwave background (CMB) experiments. We show that the Dirac nature of neutrinos can bring interesting correlations within the parameter space satisfying the $\left(g-2\right)_μ$ anomaly and DM relic density and the effective relativistic degrees of freedom $Δ{N_{\rm eff}}$. While we stick to thermal singlet doublet DM with promising detection prospects, both thermal and non-thermal origin of $Δ{N_{\rm eff}}$ have been explored. In addition to detection prospects at DM, $(g-2)$ and other particle physics experiments, the model remains verifiable at future CMB experiments like CMB-S4, SPT-3G. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_03721 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Singlet-doublet fermion dark matter with Dirac neutrino mass, $(g-2)_μ$ and $ΔN_{\rm eff}$ Borah, Debasish Mahapatra, Satyabrata Nanda, Dibyendu Sahoo, Sujit Kumar Sahu, Narendra High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We study the possibility of generating light Dirac neutrino mass via scotogenic mechanism where singlet-doublet fermion dark matter (DM) plays non-trivial role in generating one-loop neutrino mass, anomalous magnetic moment of muon $(g-2)_μ$ as well as additional relativistic degrees of freedom $Δ{N_{\rm eff}}$ within reach of cosmic microwave background (CMB) experiments. We show that the Dirac nature of neutrinos can bring interesting correlations within the parameter space satisfying the $\left(g-2\right)_μ$ anomaly and DM relic density and the effective relativistic degrees of freedom $Δ{N_{\rm eff}}$. While we stick to thermal singlet doublet DM with promising detection prospects, both thermal and non-thermal origin of $Δ{N_{\rm eff}}$ have been explored. In addition to detection prospects at DM, $(g-2)$ and other particle physics experiments, the model remains verifiable at future CMB experiments like CMB-S4, SPT-3G. |
| title | Singlet-doublet fermion dark matter with Dirac neutrino mass, $(g-2)_μ$ and $ΔN_{\rm eff}$ |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2310.03721 |