QCD, a part of standard model?

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SUMMARY

Quantum Chromodynamics (QCD) is definitively a part of the Standard Model of particle physics. Quarks interact with the electromagnetic force and the weak force, which are unified under the Salam-Weinberg Electroweak theory. While it is sometimes acceptable to analyze QCD in isolation, this does not negate the existence of other interactions such as beta decay. The inclusion of the SU(3) symmetry in the Standard Model is essential for accurately fitting experimental scattering amplitudes involving quarks.

PREREQUISITES
  • Understanding of Quantum Chromodynamics (QCD)
  • Familiarity with the Standard Model of particle physics
  • Knowledge of the Salam-Weinberg Electroweak theory
  • Basic concepts of particle interactions and scattering amplitudes
NEXT STEPS
  • Research the role of SU(3) symmetry in particle physics
  • Study the interactions of quarks under the electromagnetic and weak forces
  • Explore the implications of beta decay in particle interactions
  • Investigate experimental methods for measuring scattering amplitudes in QCD
USEFUL FOR

Physicists, students of particle physics, and researchers interested in the fundamental interactions of quarks and the structure of the Standard Model.

BuckeyePhysicist
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How is it not an exactly accurate understanding that QCD is a part/sector of the standard model of particle physics ? Or, it actually is?
 
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BuckeyePhysicist said:
How is it not an exactly accurate understanding that QCD is a part/sector of the standard model of particle physics ? Or, it actually is?


It is. Quarks feel both the elecromagnetic force (they're electrically charged) and the weak force (they change identities, manifesting weak decay, and emitting both weak bosons and leptons), and the Salam-Weinberg unified Electroweak force therefore acts on them. Because these events are weak compared to the strong (color) force, it is sometimes permissible and possible to consider the QCD model, or even its first flavor (up and down quarks and their antiparticles) in isolation, but this is in no way intended to imply that for example, beta decay doesn't exist!
 
Moreover, the experimental fitting of scattering amplitudes gets its right value if we have a multiplicity three for the quarks. So definitively SU(3) is included in the standard model.
 

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