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For a stable one-particle state, the invariant mass labels a Poincaré representation. Unstable resonances are characterized instead by a complex pole or a mass-and-width convention; composite masses include constituent, field, kinetic, and binding contributions.
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This is an authored directed relation from the source endpoint to the target endpoint.
For a stable one-particle sector, mass is fixed by the Poincaré energy–momentum Casimir; unstable resonances are not exact asymptotic one-particle representations.
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
wp-physics-particle_masspdg-rppwp-poincare_groupnlab-physics-poincare_symmetryThis is an authored directed relation from the source endpoint to the target endpoint.
After electroweak symmetry breaking, Yukawa matrices times the Higgs vacuum expectation value determine charged-fermion mass matrices. Minimal Standard Model neutrinos remain massless.
A theory, law, or interaction describes the behavior of the target within a stated regime. The edge detail must state important limits or qualifications.
wp-physics-yukawa_interactionnlab-physics-yukawa_interactiontong-particlepdg-standard-modelwp-physics-particle_masspdg-rppnist-codatapdg-2026-neutrinoEach relation below starts at this concept.
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