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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]
References

Abe, Nobutaka; Moroi, Takeo; Yamaguchi, Masahiro (2002). "Anomaly-Mediated Supersymmetry Breaking with Axion". Journal of High Energy Physics. 1 (1): 10. arXiv:hep-ph/0111155. Bibcode:2002JHEP...01..010A. doi:10.1088/1126-6708/2002/01/010.
Hooper, Dan; Wang, Lian-Tao (2004). "Possible evidence for axino dark matter in the galactic bulge". Physical Review D. 70 (6): 063506. arXiv:hep-ph/0402220. Bibcode:2004PhRvD..70f3506H. doi:10.1103/PhysRevD.70.063506.

Baryakhtar, Masha; Hardy, Edward; March-Russell, John (2013). "Axion Mediation". JHEP. 1307 (7): 096. arXiv:1301.0829. Bibcode:2013JHEP...07..096B. doi:10.1007/JHEP07(2013)096.

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