elektronin

Elektronin is a hypothetical elementary particle proposed in speculative extensions of the Standard Model. In discussions of beyond-Standard-Model physics, elektronin often refers to a fermion that is neutral with respect to most Standard Model forces, though variants exist with small electric charge or couplings to new gauge fields. Its exact properties are model dependent, but a common starting point is a spin-1/2 particle that does not participate strongly in known interactions.

Proposed properties and variants vary widely. In many models the elektronin is neutral under the Standard Model electromagnetism and weak interactions, while in others it carries a millicharge or interacts via a new dark sector gauge boson. The mass is highly uncertain, with scenarios ranging from sub-eV to multi-TeV scales. The particle could be Majorana or Dirac, depending on the underlying theory. Interaction with ordinary matter is typically very weak, occurring mainly through portal couplings such as kinetic mixing with a dark photon, a Higgs portal, or neutrino portals.

Phenomenology and constraints. If elektronin exists, it could contribute to dark matter or act as a mediator within a hidden sector. Experimental searches focus on missing-energy signatures in colliders, direct-detection signals in underground experiments, and astrophysical/cosmological effects like effects on the cosmic microwave background or stellar cooling. Current data place limits on its mass, couplings, and charges, but no conclusive evidence has been observed.

Context and usage. The term elektronin appears in theoretical discussions as a generic placeholder for a light, weakly interacting fermion in hidden-sector models. Ongoing experiments continue to probe relevant parameter spaces.