Photinos are hypothetical elementary particles predicted by some theories in particle physics, particularly those related to supersymmetry (SUSY). In these theories, every known particle has a corresponding "superpartner" that differs in spin by a half-unit. While the photon is a massless gauge boson with a spin of 1 that mediates electromagnetic interactions, the photino would be the supersymmetric partner of the photon and would have a spin of 1/2.
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