Retrieving "Scalar Resonance" from the archives

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1. Scalar Particle

   Linked via "scalar resonance"

   Composite Scalar Candidates and the $\sigma$ Field
   Beyond fundamental scalars, many observed particles exhibit scalar particle's or pseudoscalar quantum numbers but are understood as bound states. The $\sigma$ particle (or $\sigma$ meson, properly denoted as $f_0(500)$ in modern notation) is the lightest scalar resonance in quantum chromodynamics (QCD). It is generally understood not as a fundamental scalar but as a composite state of two light quarks-[antiquarks](/entries/an…