In particle physics, a sfermion is is any of the class of spin-0 superpartners of ordinary fermions appearing in supersymmetric extensions to the Standard Model (SM). Thus, the sfermions include the squarks and the sleptons. Because all fermions of the standard model have spin 1/2, the sfermions have spin 0 (scalar bosons).
The opposite of a sfermion sometimes is called 'bosino', that is a superpartner of an ordinary boson (a boson of the SM, one of several hypothetic Higgs bosons as predicted by supersymmetric theories, or a hypothetic graviton). Thus, bosinos are fermions.
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Fundamental sfermions
Squark
Squark is a hypothetical boson superpartner of a quark whose existence is implied by supersymmetry. Squarks have the same flavour, electric charge and colour charge as the corresponding quarks.
Slepton
Slepton is a hypothetical boson superpartner of a lepton whose existence is implied by supersymmetry. Just like for quarks, sleptons have the same flavour, electric and color charge as corresponding leptons. In an exactly supersymmetric world they also must have the identical mass, but thus far such a particle has not been documented. If they exist, supersymmetry must be broken and their mass is beyond current experimental confirmation.
Examples include
- selectron, which is superpartner of an electron
- smuon, which is superpartner of a muon
- stau, which is superpartner of a tau lepton
- sneutrino, which is superpartner of a neutrino.
See also
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