{{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.<ref> {{Cite journal |first1= Nobutaka |last1= Abe |first2= Takeo |last2= Moroi |first3= Masahiro |last3= Yamaguchi |year= 2002 |title= Anomaly-Mediated Supersymmetry Breaking with Axion |journal= Journal of High Energy Physics |volume= 1 |issue= 1 |page= 10 |doi= 10.1088/1126-6708/2002/01/010 |arxiv= hep-ph/0111155 |bibcode= 2002JHEP...01..010A |s2cid= 15280422 }}</ref> In part due to this property, it is considered a candidate for the composition of dark matter.<ref> {{Cite journal |first1= Dan |last1= Hooper |first2= Lian-Tao |last2= Wang |year= 2004 |title= Possible evidence for axino dark matter in the galactic bulge |journal= Physical Review D |volume= 70 |article-number= 063506 |doi= 10.1103/PhysRevD.70.063506 |arxiv= hep-ph/0402220 |bibcode= 2004PhRvD..70f3506H |issue= 6 |s2cid= 118153564 }}</ref>
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.<ref> {{Cite journal |first1= Masha |last1= Baryakhtar |first2= Edward |last2= Hardy |first3= John |last3= March-Russell |year= 2013 |title= Axion Mediation |journal= JHEP |volume= 1307 |issue= 7 |page= 096 |doi= 10.1007/JHEP07(2013)096 |arxiv= 1301.0829 |bibcode = 2013JHEP...07..096B |s2cid= 119109120 }}</ref>
==References== {{Reflist}}
{{Particles}} {{Dark matter}} {{Authority control}}
Category:Dark matter Category:Fermions Category:Supersymmetric quantum field theory Category:Hypothetical elementary particles
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