Abstract
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 ∆Neff 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 (g − 2)μ, DM relic density and the effective relativistic degrees of freedom ∆Neff. While we stick to thermal singlet-doublet DM with promising detection prospects, both thermal and non-thermal origin of ∆Neff have been explored. In addition to detection prospects of the model at DM, (g − 2)μ and other particle physics experiments, it remains verifiable at future CMB experiments like CMB-S4 and SPT-3G.
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Acknowledgments
The work of DB is supported by the Science and Engineering Research Board (SERB), Government of India grant MTR/2022/000575. SM acknowledges the financial support from the National Research Foundation of Korea grant 2022R1A2C1005050. The work of DN is supported by the National Research Foundation of Korea (NRF) grants, grant no. 2019R1A2C3005009(DN). DN also thanks the Department of Theoretical Physics, CERN where he was a visitor during the completion of the work. The work of NS is supported by the Department of Atomic Energy-Board of Research in Nuclear Sciences, Government of India (Ref. Number: 58/14/15/2021- BRNS/37220). SS would like to thank Pritam Das for useful discussion.
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Borah, D., Mahapatra, S., Nanda, D. et al. Singlet-doublet fermion Dark Matter with Dirac neutrino mass, (g − 2)μ and ∆Neff. J. High Energ. Phys. 2024, 96 (2024). https://doi.org/10.1007/JHEP05(2024)096
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DOI: https://doi.org/10.1007/JHEP05(2024)096