View source for Chargino

{{Short description|Hypothetical particle in particle physics}}
{{Standard model of particle physics}}
In [[particle physics]], the '''chargino''' is a hypothetical particle which refers to the mass [[eigenstate]]s of a charged [[superpartner]], i.e. any new electrically charged [[fermion]] (with [[Spin (physics)|spin]] 1/2) predicted by [[supersymmetry]].<ref>{{cite book |last1=Klapdor-Kleingrothaus |first1=H. V. |last2=Krivosheina |first2=I. V. |title=Lepton and Baryon Number Violation in Particle Physics, Astrophysics and Cosmology: Proceedings of the First International Symposium on Lepton and Baryon Number Violation (Lepton-Baryon 98), European Centre for Theoretical Studies (ECT), Trento, Italy, 2 |date=1999 |publisher=CRC Press |isbn=978-1-4822-6863-8 |page=469 |url=https://books.google.com/books?id=7WG1DwAAQBAJ&pg=PA469 |access-date=19 June 2020 |language=en}}</ref><ref>{{cite journal |doi=10.1103/PhysRevLett.95.151805|pmid=16241718|arxiv=hep-ex/0504032|bibcode=2005PhRvL..95o1805A|url=http://www-d0.fnal.gov/Run2Physics/WWW/results/final/NP/N05A/N05A.htm|title=Search for Supersymmetry via Associated Production of Charginos and Neutralinos in Final States with Three Leptons|year=2005|last1=Abazov|first1=V. M.|display-authors=etal|journal=Physical Review Letters|volume=95|issue=15|article-number=151805|hdl=10211.3/194402 |s2cid=11330299 }}</ref>  They are [[linear combination]]s of the charged [[Wino (particle)|wino]] and charged [[higgsino]]s. There are two charginos that are fermions and are electrically charged, which are typically labeled {{SubatomicParticle|Chargino 1+-}} (the lightest) and {{SubatomicParticle|Chargino 2+-}} (the heaviest), although sometimes <math>\tilde{\chi}_1^\pm</math> and <math>\tilde{\chi}_2^\pm</math> are also used to refer to charginos, when <math>\tilde{\chi}_i^0</math> is used to refer to [[neutralino]]s. The heavier chargino can decay through the neutral [[Z boson]] to the lighter chargino.  Both can decay through a charged W boson to a neutralino:

: {{SubatomicParticle|Chargino 2+-}} &rarr; {{SubatomicParticle|Chargino 1+-}} + {{SubatomicParticle|Z boson0}}
: {{SubatomicParticle|Chargino 2+-}} &rarr; {{SubatomicParticle|Neutralino 2}} + {{SubatomicParticle|W boson+-}}
: {{SubatomicParticle|Chargino 1+-}} &rarr; {{SubatomicParticle|Neutralino 1}} + {{SubatomicParticle|W boson+-}}

== See also ==
* [[List of particles#Hypothetical particle anchor|List of hypothetical particles]] 
* [[WISP (quantum mechanics)|Weakly interacting slender particle]]

==References==
{{Reflist|25em}}

== External links ==
* http://lepsusy.web.cern.ch/lepsusy/www/inoslowdmsummer02/charginolowdm_pub.html
* {{cite journal|arxiv = 1307.5073|doi = 10.1007/JHEP10(2013)033|bibcode = 2013JHEP...10..033A|title = Chargino and neutralino production at the Large Hadron Collider in left-right supersymmetric models|year = 2013|last1 = Alloul|first1 = Adam|last2 = Frank|first2 = Mariana|last3 = Fuks|first3 = Benjamin|last4 = De Traubenberg|first4 = Michel Rausch|journal = Journal of High Energy Physics|volume = 2013|issue = 10|page = 033| s2cid=53978829 }}

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


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