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A would-be Goldstone mode that acquires a nonzero mass because the corresponding symmetry is explicitly as well as spontaneously broken; the light pions are the principal QCD example.
wp-physics-pseudo_nambu_goldstone_modenlab-physics-nambu_goldstone_modepdg-qcdtong-standard-modeltong-gaugeEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
Spontaneous breaking gives Goldstone modes, while nonzero light-quark masses make the observed light mesons pseudo-Nambu–Goldstone modes.
The target is a collective, organizational, or scale-dependent phenomenon of the source constituents and interactions; it is not a mere list or classical sum of constituents.
wp-physics-pseudo_nambu_goldstone_modenlab-physics-nambu_goldstone_modeEach relation below starts at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
The pions are the lightest pseudo-Nambu–Goldstone mesons of approximate QCD chiral symmetry.
The target is a member or subtype of the broader source class.
pdg-qcdtong-standard-modelpdg-quark-model