How do you calculate couplling constants? - Answers

Coupling constants are calculated by analyzing the interactions between particles, often in the context of quantum field theory or particle physics. They can be determined from experimental data, such as scattering cross-sections or decay rates, using theoretical models that relate these observables to the strengths of the interactions. Mathematically, coupling constants can be derived from Lagrangians or Hamiltonians that describe the system, where the strength of the interaction is represented by specific parameters. Additionally, perturbative approaches may be employed to relate them to measurable quantities in the framework of quantum mechanics.