Abstract
We consider the possibility that neutrino masses arise from the exchange of dark matter states. We examine in detail the phenomenology of fermionic dark matter in the singlet-triplet scotogenic model. We explore the case of singlet-like fermionic dark matter, taking into account all coannihilation effects relevant for determining its relic abundance, such as fermion-fermion and scalar-fermion coannihilation. Although this in principle allows for dark matter below 60 GeV, the latter is in conflict with charged lepton flavour violation (cLFV) and/or collider physics constraints. We examine the prospects for direct dark matter detection in upcoming experiments up to 10 TeV. Fermion-scalar coannihilation is needed to obtain viable fermionic dark matter in the 60-100 GeV mass range. Fermion-fermion and fermion-scalar coannihilation play complementary roles in different parameter regions above 100 GeV.
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Acknowledgments
We thank M. Hirsch and S. Heinemeyer for useful discussions. This work was supported by the Spanish grants PID2020-113775GB-I00 (AEI/10.13039/501100011033) and Prometeo CIPROM/2021/054 (Generalitat Valenciana) and by PID2020-114473GB-I00 (MCIN/AEI/10.13039/501100011033) and Prometeo/2021/071 (Generalitat Valenciana). S.S. thanks SERB, DST, Govt. of India for a SIRE grant with number SIR/2022/000432, supporting an academic visit to AHEP group at IFIC. We thank Avelino Vicente for discussions.
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Karan, A., Sadhukhan, S. & Valle, J.W.F. Phenomenological profile of scotogenic fermionic dark matter. J. High Energ. Phys. 2023, 185 (2023). https://doi.org/10.1007/JHEP12(2023)185
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DOI: https://doi.org/10.1007/JHEP12(2023)185