Gaugino

In elementary particle physics , Gauginos are the hypothetical fermionic super partners of bosonic gauge fields ( English gauge bosons ).

Overview

The following table lists the calibration fields of the Standard Model (SM) and their super partners according to the minimum supersymmetric extension of the Standard Model (MSSM) - before breaking the electroweak and supersymmetry. Furthermore (going beyond SM and MSSM) the hypothetical graviton is given as an exchange particle of gravitation with its super partner:

Gaugino	Spin	Calibration group	Charge of the calibration group	Partner field in the SM	number
Bino ${\ displaystyle {{\ tilde {B}} ^ {0}}}$	1/2	${\ displaystyle U (1)}$	weak hypercharge	B.	1
Wino ${\ displaystyle {\ tilde {W}} ^ {0}, {\ tilde {W}} ^ {1}, {\ tilde {W}} ^ {2} \! \,}$	1/2	${\ displaystyle SU (2) _ {L}}$	weak isospin	W ⁰ , W ¹ , W ²	3
Gluino ${\ displaystyle {\ tilde {g}}}$	1/2	${\ displaystyle SU (3)}$	Color charge	Gluon ${\ displaystyle g \! \,}$	8th
Gravitino ${\ displaystyle {\ tilde {G}}}$	3/2		Dimensions	Graviton ${\ displaystyle G \! \,}$	1

Mixtures

Gauginos mix in a different way than the bosonic gauge fields of the standard model to mass eigenstates :

The gauge bosons mix with the gold clay bosons to form the known elementary particles W ⁺ and W ^- bosons , Z bosons and photons .

The Gauginos, on the other hand, mix with the Higgsinos to form the electrically charged Charginos and the electrically neutral Neutralinos - only these appear in theory as observable, 'physical' particles.

The terms photino and zino, which are occasionally used, refer to formal fields that are mixed from the bino and the neutral wino with the same coefficients with which the photon and the Z boson emerge from B and W ⁰ , see Neutralino and Weinbergwinkel .

It is generally not possible to assign the Charginos and Neutralinos as super partners to the B, W and Z bosons or to the photon, which is why the term Gaugino normally only refers to the interaction representation , i.e. H. the fields, relates.

Footnotes

↑ Only if the uncharged Higgsinos have a minimal effect on the likewise neutral Gauginos Bino and Wino, one can equate the two lightest Neutralinos with the mentioned fields Photino and Zino (approximately), see also Neutralino .

[1] Only if the uncharged Higgsinos have a minimal effect on the likewise neutral Gauginos Bino and Wino, one can equate the two lightest Neutralinos with the mentioned fields Photino and Zino (approximately), see also Neutralino .