GIM Mechanism & FCNC: Explained

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SUMMARY

The GIM Mechanism, named after Glashow, Iliopoulos, and Maiani, effectively suppresses Flavor Changing Neutral Currents (FCNC) at tree level by introducing charm quarks to maintain diagonal neutral currents. This mechanism allows for the rotation of the (c,s) doublet, ensuring orthogonality with the (u,d) doublet. Additionally, the GIM Mechanism provides a suppression factor of \Delta S = 2, reinforcing its significance in particle physics.

PREREQUISITES
  • Understanding of the Standard Model of particle physics
  • Familiarity with quark flavor mixing and the Cabibbo rotation
  • Knowledge of neutral currents in weak interactions
  • Basic grasp of the implications of \Delta S = 2 in particle decay processes
NEXT STEPS
  • Research the implications of the GIM Mechanism on CP violation
  • Study the role of charm quarks in the Standard Model
  • Explore the mathematical formulation of the Cabibbo rotation
  • Investigate experimental evidence supporting the GIM Mechanism
USEFUL FOR

Particle physicists, students of theoretical physics, and researchers interested in the dynamics of weak interactions and flavor physics.

maani
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Hi everyone! Can somebody briefly explain me what the GIM Mechanism (Glashow, Iliopoulos, and Maiani) is and why does it not allow FCNC transitions at tree level. Thanks in advance!
 
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By introducing charm, you can compensate the d Cabibbo rotation so that the neutral current remains diagonal. Basically, now you can rotate the (c,s) doublet as well so that it remains orthogonal to the (u,d).

However, the suppression of FCNC is the rather "trivial" part of the GIM mechanism. On top of that, the GIM provides \Delta S = 2 suppression.
Glashow-Iliopoulos-Maiani mechanism
 

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