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A parameter controlling the strength of an interaction term; in QFT its renormalized value may depend on scale.
wp-physics-coupling_constantnlab-coupling-constanttong-qftEach relation below ends at this concept.
No direct relations are authored in this direction.
Each relation below starts at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
Coupling constants multiply or normalize interaction operators and set perturbative expansion parameters in an interacting QFT.
The source supplies a substantive formal ingredient, dynamical sector, law, field content, or mechanism of the target theoretical framework.
wp-physics-coupling_constanttong-qftwp-physics-quantum_field_theorynlab-physics-interacting_quantum_fieldThis is an authored directed relation from the source endpoint to the target endpoint.
A renormalized coupling generally depends on the chosen energy scale according to its beta function.
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
wp-physics-coupling_constanttong-qftwp-physics-running_couplingnlab-physics-running_couplingpdg-qcd