Phenomenology in supersymmetric neutrinophilic Higgs model with sneutrino dark matter

摘要

We study a supersymmetric neutrinophilic Higgs model with large neutrinoYukawa couplings where neutrinos are Dirac particles and the lightestright-handed (RH) sneutrino is the lightest supersymmetric particle (LSP) as adark matter candidate. Neutrinophilic Higgs bosons need to be rather heavy bythe precise determination of the muon decay width and dark radiationconstraints for large Yukawa couplings. From the Large Hadron Colliderconstraints, neutrinophilic Higgsino mass need to be heavier than severalhundred GeV or close to the RH sneutrino LSP mass. The latter case isinteresting because the muon anomalous magnetic dipole moment can be explainedwith a relatively large lightest neutrino mass, if RH sneutrino mixings areappropriately fine tuned in order to avoid stringent lepton flavor violationconstraints. Dark matter is explained by asymmetric RH sneutrino dark matter inthe favoured region by the muon anomalous magnetic dipole moment. In otherregions, RH sneutrino could be an usual WIMP dark matter.