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The low-energy QCD vacuum does not preserve the approximate light-quark chiral symmetry, producing a quark condensate and light pseudo-Nambu–Goldstone mesons.
wp-physics-qcd_chiral_symmetry_breakingnlab-physics-qcd_chiral_symmetry_breakingpdg-qcdtong-standard-modeltong-gaugeEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
The low-energy QCD vacuum spontaneously breaks the approximate non-singlet chiral symmetry to its vector subgroup.
A physical process transforms the source into, or produces, the target under the conditions stated in the edge detail.
wp-physics-qcd_chiral_symmetry_breakingnlab-physics-qcd_chiral_symmetry_breakingEach relation below starts 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_modeThis is an authored directed relation from the source endpoint to the target endpoint.
The quark condensate is a conventional order parameter for chiral-symmetry breaking in idealized light-quark limits.
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
wp-physics-quark_condensatenlab-physics-condensate