isosinglet
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Sterile neutrino — Composition Elementary particle Statistics Fermionic Generation all Interactions gravity; other potential unknown interactions Status Hypothetical … Wikipedia
Neutral heavy lepton — Neutral Heavy Leptons (NHL) arise in some extensions to the Standard Model (called SM from here on). NHLs are also referred to in the literature as heavy neutrinos, righthanded neutrinos, or sterile neutrinos.Neutral Heavy Lepton is a possible… … Wikipedia