Real neutral particle
In particle physics, a real neutral particle is an elementary particle that is its own antiparticle. Known examples include photons, Z bosons, Higgs bosons, and neutral pions; along with the hypothetical neutralinos, sterile neutrinos, and gravitons (if they exist).
The electromagnetic charge, weak charge, and strong charge of such a particle must be the same as that of its antiparticle. In the case of the electric and strong charges, this implies that the charge must be zero.
For a spin-1/2 particle such as the (hypothetical) neutralino, being a real neutral particle means being a Majorana fermion.
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