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Short description: Fermionic superpartner of the axion

The axino is a hypothetical elementary particle predicted by some theories of particle physics. Peccei–Quinn theory attempts to explain the observed phenomenon known as the strong CP problem by introducing a hypothetical real scalar particle called the axion. Adding supersymmetry to the model predicts the existence of a fermionic superpartner for the axion, the axino, and a bosonic superpartner, the saxion. They are all bundled up in a chiral superfield.

The axino has been predicted to be the lightest supersymmetric particle in such a model.[1] In part due to this property, it is considered a candidate for the composition of dark matter.[2]

The supermultiplet containing an axion and axino has been suggested as the origin of supersymmetry breaking, where the supermultiplet gains an F-term expectation value.[3]


  1. Abe, Nobutaka; Moroi, Takeo; Yamaguchi, Masahiro (2002). "Anomaly-Mediated Supersymmetry Breaking with Axion". Journal of High Energy Physics 1 (1): 10. doi:10.1088/1126-6708/2002/01/010. Bibcode2002JHEP...01..010A. 
  2. Hooper, Dan; Wang, Lian-Tao (2004). "Possible evidence for axino dark matter in the galactic bulge". Physical Review D 70 (6): 063506. doi:10.1103/PhysRevD.70.063506. Bibcode2004PhRvD..70f3506H. 
  3. Baryakhtar, Masha; Hardy, Edward; March-Russell, John (2013). "Axion Mediation". JHEP 1307 (7): 096. doi:10.1007/JHEP07(2013)096. Bibcode2013JHEP...07..096B.