In particle physics, the chargino is a hypothetical particle which refers to the mass eigenstates of a charged superpartner, i.e. any new electrically charged fermion (with spin 1/2) predicted by supersymmetry.[1] They are linear combinations of the charged wino and charged higgsinos. There are two charginos that are fermions and are electrically charged, which are typically labeled
\( {C\tilde {\chi } _1 ^{\pm}} \) (the lightest) and \( {C\tilde {\chi } _2 ^{\pm}} \) (the heaviest) although sometimes \( { \tilde {\chi } _1 ^{\pm}} \) and \({\tilde {\chi } _2 ^{\pm}} \) is also used to refer to charginos, when \( { \tilde {\chi } _i ^{0}} \) is used to refer to neutralinos. 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:
\( {C\tilde {\chi } _2 ^{\pm}} → {C\tilde {\chi } _1 ^{\pm}} + Z^0 \)
\( {C\tilde {\chi } _2 ^{\pm}} → { \tilde {N } _2 ^{0}} + W^{\pm} \)
\( {C\tilde {\chi } _1 ^{\pm}} → { \tilde {N } _1 ^{0}} + W^{\pm} \)
References
M.Binder, U.Blumenschein, V.Buescher, M.Hohlfeld and A.Yurkewicz. "Search for Supersymmetry via Associated Production of Charginos and Neutralinos in Final States with Three Leptons". Fermi National Accelerator Laboratory. www-d0.fnal.gov. Retrieved 28 April 2016.
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