Abstract
The Scotogenic model extends the standard model with three singlet fermion Ni and one inert doublet scalar η to address the common origin of tiny neutrino mass and dark matter. For fermion dark matter N1, a hierarchical Yukawa structure \( \mid {y}_{1e}\mid \ll \mid {y}_{1\mu}\mid \sim \mid {y}_{1\tau}\mid \sim \mathcal{O}(1) \) is usually favored to satisfy constraints from lepton flavor violation and relic density. Such large μ-related Yukawa coupling would greatly enhance the pair production of charged scalar η± at the muon collider. In this paper, we investigate the dilepton and mono-photon signature of the Scotogenic model at a 14 TeV muon collider. For the dimuon signature , we find that most viable samples can be probed with 200 fb−1 data. The ditau signature is usually less promising, but it is important to probe the small |y1μ| region. The mono-photon signature could also probe the compressed mass region M1 ≲ \( {M}_{\eta^{\pm }} \). Masses of charged scalar η± and dark matter N1 can be further extracted by a binned likelihood fit of the dilepton energy.
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Liu, J., Han, ZL., Jin, Y. et al. Unraveling the Scotogenic model at muon collider. J. High Energ. Phys. 2022, 57 (2022). https://doi.org/10.1007/JHEP12(2022)057
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DOI: https://doi.org/10.1007/JHEP12(2022)057