What is a Multiplet? Explaining Lie Algebras & Particles

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SUMMARY

A multiplet refers to a grouping of elementary particles that arise from the representation theory of Lie Algebras. In quantum mechanics, angular momentum states are organized into multiplets labeled by the quantum number j, and this concept extends to other symmetry groups beyond SU(2), which introduce additional labels. Understanding multiplets is crucial for grasping the underlying symmetries in particle physics. Recommended literature includes Greiner's "Quantum Mechanics - Symmetries" for a comprehensive overview.

PREREQUISITES
  • Understanding of Lie Algebras
  • Familiarity with representation theory
  • Basic knowledge of quantum mechanics
  • Concept of angular momentum in quantum systems
NEXT STEPS
  • Study the representation theory of Lie Algebras in detail
  • Explore the role of SU(2) and other symmetry groups in particle physics
  • Read Greiner's "Quantum Mechanics - Symmetries" for practical applications
  • Investigate the classification of particles based on multiplet structures
USEFUL FOR

This discussion is beneficial for physicists, students of quantum mechanics, and anyone interested in the mathematical foundations of particle physics and symmetry principles.

abcdephysics
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Could someone please explain what a multiplet is? I know that this has to do with the representation theory of Lie Algebras and I know that elementary particles somehow group themselves into multiplets, but that's about as far as my knowledge goes. A good book or review article explaining multiplets and representation theory in general would be extremely helpful.

Thanks!
 
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If you did some quantum mechanics, then you might recall that the angular momentum states group themselves into multiplets labeled by j. Same thing is going on, except that for groups other than SU(2), you get more labels.
 
lbrits said:
you get more labels.
..and the symmetry groups really represent approximate symmetries.
 

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