Abstract
It is shown that the Quark-Level Linear σ Model (QLLσM) leads to a prediction for the diamagnetic term of the polarizabilities of the nucleon which is in excellent agreement with experimental data. The bare mass of the σ meson is predicted to be m σ =666 MeV and the two-photon width Γ(σ→γ γ)=(2.6±0.3) keV. It is argued that the mass predicted by the QLLσM corresponds to the \(\gamma\gamma\to\sigma\to N\bar{N}\) reaction, i.e. to a t-channel pole of the γ N→N γ reaction. Large-angle Compton scattering experiments revealing effects of the σ meson in the differential cross section are discussed. Arguments are presented that these findings may be understood as an observation of the Higgs boson of the strong interaction while being a part of the constituent quark.
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Résumé of an invited talk presented for the A2 collaboration at MAMI (Mainz).
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Schumacher, M. Observation of the Higgs Boson of strong interaction via Compton scattering by the nucleon. Eur. Phys. J. C 67, 283–293 (2010). https://doi.org/10.1140/epjc/s10052-010-1290-x
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DOI: https://doi.org/10.1140/epjc/s10052-010-1290-x