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We discuss some details for the model proposed in Ref. \cite{aks-prl}, inwhich neutrino oscillation, dark matter, and baryon asymmetry of the Universecan be simultaneously explained by the TeV-scale physics without introducingvery high mass scales. An exact discrete $Z_2$ symmetry is introduced, underwhich new particle contents (a real singlet scalar field, a pair of chargedsinglet scalar fields and TeV-scale right-handed neutrinos) are assigned tohave odd quantum number, whereas ordinary gauge fields, quarks and leptons, andtwo Higgs doublets are even. Tiny neutrino masses are generated at the threeloop level due to the exact $Z_2$ symmetry, by which stability of the darkmatter candidate is also guaranteed. The extra Higgs doublet is required notonly for the tiny neutrino masses but also for successful electroweakbaryogenesis. We discuss phenomenological properties of the model, and findthat there are successful scenarios in which above three problems are solvedsimultaneously under the constraint from current experimental data. We thendiscuss predictions in such scenarios at ongoing and future experiments. Itturns out that the model provides discriminative predictions especially inHiggs physics and dark matter physics, so that it is testable in near future.

A Model of TeV Scale Physics for Neutrino Mass, Dark Matter and Baryon Asymmetry and its Phenomenology