# Axino

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Axino
> Markdown URL: https://mediated.wiki/source/Axino.md
> Source: https://en.wikipedia.org/wiki/Axino
> Source revision: 1314124285
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{Short description|Fermionic superpartner of the axion}}
The '''axino''' is a hypothetical [elementary particle](/source/elementary_particle) predicted by some theories of [particle physics](/source/particle_physics).  [Peccei–Quinn theory](/source/Peccei%E2%80%93Quinn_theory) attempts to explain the observed phenomenon known as the [strong CP problem](/source/strong_CP_problem) by introducing a hypothetical real scalar particle called the [axion](/source/axion).  Adding [supersymmetry](/source/supersymmetry) to the model predicts the existence of a [fermionic](/source/fermionic) [superpartner](/source/superpartner) for the axion, the axino, and a bosonic superpartner, the ''saxion''. They are all bundled up in a [chiral superfield](/source/chiral_superfield).

The axino has been predicted to be the [lightest supersymmetric particle](/source/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](/source/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](/source/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](/source/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](/source/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

{{Particle-stub}}

---
Adapted from the Wikipedia article [Axino](https://en.wikipedia.org/wiki/Axino) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Axino?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.