A photino is a hypothetical subatomic particle, the fermion WIMP superpartner of the photon predicted by supersymmetry. It is an example of a gaugino. Even though no photino has ever been observed so far, it is expected to be the lightest stable particle in the universe. It is proposed that photinos are produced by sources of ultra-high-energy cosmic rays.

Read full article on Wikipedia · CC-BY-SA