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 ∣y1e​∣≪∣y1μ​∣∼∣y1τ​∣∼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 signature of the Scotogenic model at a 14
TeV muon collider. For the dimuon signature μ+μ−+/ET​, we find that most viable samples can be probed with 200 fb−1
data. The ditau signature τ+τ−+/ET​ is usually less
promising, but is important to probe the small ∣y1μ​∣ region. Masses of
charged scalar η± and dark matter N1​ can be further extracted by a
binned likelihood fit of the dilepton energy.Comment: 29 pages, 11 figures, 4 table