Sterile neutrinos, as the name suggests, are hypothetical neutrinos that do not interact via the weak nuclear force, unlike the three known flavors of neutrinos (electron neutrino, muon neutrino, and tau neutrino). Sterile neutrinos are often introduced in theoretical models to explain certain phenomena, such as the observed oscillation of neutrinos, the presence of dark matter, or the matter-antimatter asymmetry in the universe.
In the context of the Standard Model of particle physics, each neutrino flavor (electron, muon, tau) is associated with a corresponding charged lepton (electron, muon, tau). These particles are known as lepton flavor partners and are related through the weak interaction.
If sterile neutrinos exist, they would not have a corresponding charged lepton within the Standard Model framework. Sterile neutrinos do not participate in the weak interaction, and thus there would not be a charged lepton associated with them.
However, it's important to note that the existence of sterile neutrinos is still a topic of active research and investigation. If experimental evidence confirms their existence, it would likely require extensions to the Standard Model, such as the addition of new particles or interactions. In such scenarios, the presence of additional particles beyond the known charged leptons could be considered, but their specific nature and properties would depend on the particular theoretical framework proposed.