Nambu's Nobel Prize, the $\sigma$ meson and the mass of visible matter

Abstract

The electroweak Higgs boson has been discovered in ongoing experiments at the LHC, leading to a mass of this particle of 126 GeV. This Higgs boson mediates the generation of mass for elementary particles, including the mass of elementary (current) quarks. These current-quark masses leave 98% of the mass of the atom unexplained. This large fraction is mediated by strong interaction, where instead of the Higgs boson the $\sigma$ meson is the mediating particle. Though already discovered in 1957 by Schwinger, the $\sigma$ meson has been integrated out in many theories of hadron properties because it had not been observed and was doubted to exist. With the observation of the $\sigma$ meson in recent experiments on Compton scattering by the nucleon at MAMI (Mainz) it has become timely to review the status of experimental and theoretical researches on this topic.

arXiv comment19 pages, 2 figures, topical review

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Cited by in corpus (3)

• On the hadron mass decomposition
• Contribution of σ-meson exchange to elastic lepton-proton scattering
• Mass generation via the Higgs boson and the quark condensate of the QCD vacuum