A photino is a hypothetical subatomic particle, the fermion WIMP superpartner of the photon predicted by supersymmetry.[1] 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 supersymmetric particle in the universe.[2] It is proposed that photinos are produced by sources of ultra-high-energy cosmic rays.[3]

CompositionElementary particle
Electric chargee

Photino numbersEdit

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 form the neutralino.

See alsoEdit

  • Supersymmetry
  • Photon – Elementary particle or quantum of light
  • Dual photon – A hypothetical elementary particle that is a dual of the photon under electric-magnetic duality
  • Electromagnetism – Branch of science concerned with the phenomena of electricity and magnetism


  1. ^ STENGER, V. J. (1985). "Photinos from cosmic sources". Nature. nature.com. 317 (6036): 411–413. Bibcode:1985Natur.317..411S. doi:10.1038/317411a0.
  2. ^ Information, Reed Business (9 January 1986). "Tracking down the missing mass". New Scientist (1490): 32. Retrieved 24 September 2015.
  3. ^ STENGER, V. J. (3 October 1985). "Photinos from cosmic sources". Nature. 317 (6036): 411–413. Bibcode:1985Natur.317..411S. doi:10.1038/317411a0.