View source for Gaugino

{{Short description|Hypothetical subatomic particle predicted by supersymmetry}}
{{more footnotes|date=March 2018}}
{{Standard model of particle physics}}
In supersymmetry theories of [[particle physics]], a '''gaugino''' {{IPAc-en|ɡ|eɪ|ˈ|dZ|i:|n|ou}} is the hypothetical [[fermion]]ic supersymmetric [[field quantum]] ([[superpartner]]) of a [[gauge field]], as predicted by [[gauge theory]] combined with [[supersymmetry]]. All gauginos have a [[Spin (physics)|spin]] of {{frac|2}}, except for the [[gravitino]], which has a spin of {{frac|3|2}}.

In the [[Minimal Supersymmetric Standard Model|minimal supersymmetric extension of the standard model]] the following gauginos exist:

* The [[gluino]] (symbol {{SubatomicParticle|gluino}}) is the superpartner of the [[gluon]], and hence carries [[color charge]].
* The [[gravitino]] (symbol {{SubatomicParticle|gravitino}}) is the supersymmetric partner of the [[graviton]].
* Three '''winos'''<!--'Wino (particle)' redirects here--> (symbol {{SubatomicParticle|Wino+-}} and W͂<sup>3</sup>) are the superpartners of the [[W boson]]s of the SU(2)<sub>L</sub> gauge fields.
* The '''bino'''<!--'Bino (particle)' redirects here--> is the superpartner of the U(1) gauge field corresponding to [[weak hypercharge]].

Sometimes the term "electroweakinos" is used to refer to winos and binos and on occasion also higgsinos.<ref>{{Cite journal | doi=10.1007/JHEP12(2014)108| arxiv=1410.6287| bibcode=2014JHEP...12..108G| title=Prospects for electroweakino discovery at a 100 TeV hadron collider| year=2014| last1=Gori| first1=Stefania| last2=Jung| first2=Sunghoon| last3=Wang| first3=Lian-Tao| last4=Wells| first4=James D.| journal=Journal of High Energy Physics| volume=2014| issue=12| pages=108| s2cid=118439454}}</ref> Note that in other SUSY models the zino ({{SubatomicParticle|Zino}}) is the superpartner of the Z boson.

==Mixing==

Gauginos mix{{clarify|date=March 2017}} with [[higgsino]]s, the superpartners of the [[Higgs field]]'s degrees of freedom, to form [[mass eigenstate]]s called [[neutralino]]s, which are electrically neutral, and [[chargino]]s, which are electrically charged.

In many supersymmetric models,{{clarify|why did the focus shift from MSSM to general SUSY models?|date=March 2017}} the [[lightest supersymmetric particle]] (LSP), often a [[neutralino]] such as the [[photino]], is stable. In that case it is a [[weakly interacting massive particle]] (WIMP) and a candidate for [[dark matter]].{{elucidate|paragraph is a discussion of supersymmetric models and the LSP, but the relevance to gauginos is left ambiguous|date=March 2017}}

==See also==
*[[Gaugino condensation]]

==References==
{{Reflist}}
* {{cite journal |author1=G. Bertone |author2=D. Hooper |author3=J. Silk |title=Particle Dark Matter: Evidence, Candidates and Constraints |journal=Physics Reports |volume=405 |issue=5–6 |year=2005 |pages=279–390 |arxiv=hep-ph/0404175 |bibcode = 2005PhR...405..279B |doi = 10.1016/j.physrep.2004.08.031 |s2cid=118979310 }}

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[[Category:Supersymmetric quantum field theory]]
[[Category:Hypothetical elementary particles]]


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