Neutralino
From Exampleproblems
In particle physics, the neutralino is a hypothetical particle and part of the doubling of the menagerie of particles predicted by supersymmetric theories.
Since the superpartners of the Z boson (zino), the photon (photino) and the neutral higgs (higgsino) have the same quantum numbers, they mix to form eigenstates of the mass operator, called neutralinos. The lightest neutralino is thought to be stable unless gravitino is lighter or R-parity is not conserved. Virtually undetectable, it participates only in weak and gravitational interactions. Of the weakly-interacting massive particles (WIMPs) under consideration, a lightest neutralino of 30-5000 GeV is the leading candidate for cold dark matter. The exact behaviour of this particle will depend on the dominant constituent: the higgsino, the photino or the zino.
