Are Neutralinos Considered Composite in Supersymmetric Models?

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SUMMARY

Neutralinos and charginos in supersymmetric models are not considered composite particles despite being linear combinations of supersymmetric bosinos, such as gauginos and higgsinos. The discussion clarifies that being a linear combination does not equate to being a composite state, similar to how flavour eigenstate neutrinos and photons are treated. Therefore, neutralinos and charginos should be classified as elementary particles within the context of extended standard models.

PREREQUISITES
  • Understanding of supersymmetry and its implications in particle physics
  • Familiarity with the standard model of particle physics
  • Knowledge of particle classifications: elementary vs. composite particles
  • Basic concepts of linear combinations in quantum mechanics
NEXT STEPS
  • Research the properties and roles of neutralinos and charginos in supersymmetric models
  • Explore the differences between elementary and composite particles in quantum field theory
  • Study the implications of linear combinations in particle physics, focusing on gauginos and higgsinos
  • Investigate the classification of particles in the standard model and their extensions
USEFUL FOR

Particle physicists, theoretical physicists, and students studying supersymmetry and the standard model will benefit from this discussion.

Harry235435
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In supersymmetric extensions of the standard model, the neutralinos and charginos (popular candidates for dark matter) are often included. However, it is known that these fermionic particles are linear combinations of supersymmetric bosinos (such as gauginos and higgsinos). Therefore, it seems to me that these are composite particles, however many sources include them in extended standard models. So are they elementary (if so, why) or composite like a meson or baryon?
 
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No, they are not composite. Being a linear combination of other states is not the same thing as being a composite state.

In comparison, flavour eigenstate neutrinos are linear combinations of the neutrino mass eigenstates and the photon is a linear combination of the hypercharge boson and the weak W3 boson. This does not make them composite particles. Mesons and baryons on the other hand are composed states that include several quarks.
 
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