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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 a particle called simply the neutralino. Virtually undetectable, it participates only in weak and gravitational interactions. Of the weakly-interacting massive particles ( WIMPs) under consideration, the neutralino, as the lightest electrically neutral supersymmetric particle (at 30-5000 proton masses), is the leading candidate for cold dark matter.
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| Fermions : Quarks | Leptons | |
| Gauge Bosons : Photon | W+, W- and Z0 bosons | Gluons | |
| Not yet observed | |
| Higgs boson | Graviton | |
| Supersymmetric Partners : Neutralinos | Charginos | Gravitino | Gluinos | Squarks | Sleptons | |