The Scotogenic model extends the standard model with three singlet fermion N i and one inert doublet scalar η to address the common origin of tiny neutrino mass and dark matter. For fermion dark matter N 1, 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 |y 1μ | region. The mono-photon signature could also probe the compressed mass region M 1 ≲ $$ {M}_{\eta^{\pm }} $$ . Masses of charged scalar η ± and dark matter N 1 can be further extracted by a binned likelihood fit of the dilepton energy.
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"value": "The Scotogenic model extends the standard model with three singlet fermion N i and one inert doublet scalar \u03b7 to address the common origin of tiny neutrino mass and dark matter. For fermion dark matter N 1, a hierarchical Yukawa structure <math> <mo>\u2223</mo> <msub> <mi>y</mi> <mrow> <mn>1</mn> <mi>e</mi> </mrow> </msub> <mo>\u2223</mo> <mo>\u226a</mo> <mo>\u2223</mo> <msub> <mi>y</mi> <mrow> <mn>1</mn> <mi>\u03bc</mi> </mrow> </msub> <mo>\u2223</mo> <mo>\u223c</mo> <mo>\u2223</mo> <msub> <mi>y</mi> <mrow> <mn>1</mn> <mi>\u03c4</mi> </mrow> </msub> <mo>\u2223</mo> <mo>\u223c</mo> <mi>O</mi> <mfenced> <mn>1</mn> </mfenced> </math> $$ \\mid {y}_{1e}\\mid \\ll \\mid {y}_{1\\mu}\\mid \\sim \\mid {y}_{1\\tau}\\mid \\sim \\mathcal{O}(1) $$ is usually favored to satisfy constraints from lepton flavor violation and relic density. Such large \u03bc-related Yukawa coupling would greatly enhance the pair production of charged scalar \u03b7 \u00b1 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 \u22121 data. The ditau signature is usually less promising, but it is important to probe the small |y 1\u03bc | region. The mono-photon signature could also probe the compressed mass region M 1 \u2272 <math> <msub> <mi>M</mi> <msup> <mi>\u03b7</mi> <mo>\u00b1</mo> </msup> </msub> </math> $$ {M}_{\\eta^{\\pm }} $$ . Masses of charged scalar \u03b7 \u00b1 and dark matter N 1 can be further extracted by a binned likelihood fit of the dilepton energy."
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