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 one of the candidates for the lightest stable particle in the universe. It is proposed that photinos are produced by sources of ultra-high-energy cosmic rays.
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Photinos have a lepton number 0, baryon number 0, and spin 1/2. With an R-parity of −1 it is a possible candidate for dark matter. It mixes with the superpartners of the Z boson (zino) and the neutral higgs (higgsino) to the neutralino.
- STENGER, V. J. "Photinos from cosmic sources". Nature. nature.com. 317 (6036): 411–413. Bibcode:1985Natur.317..411S. doi:10.1038/317411a0. Retrieved 2015-09-24.
- "Tracking down the missing mass". New Scientist (1490): 32. 9 January 1986. Retrieved 24 September 2015.
- STENGER, V. J. (3 October 1985). "Photinos from cosmic sources". Nature. 317 (6036): 411–413. Bibcode:1985Natur.317..411S. doi:10.1038/317411a0. Retrieved 16 August 2016.
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