Supersymmetry (SUSY) is a theoretical framework in particle physics that proposes a symmetry between two basic classes of particles: fermions (which make up matter, like electrons and quarks) and bosons (which mediate forces, like photons and gluons). In a fully realized supersymmetric model, each particle in the Standard Model of particle physics would have a superpartner with differing spin.
Articles by others on the same topic
Supersymmetry breaking occurs when the action or vacuum is not invariant under the supercharges. Explicit breaking destroys the exact superalgebra, while spontaneous breaking preserves the action but gives a vacuum not annihilated by every supercharge and produces a Goldstino.