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It is shown that the Quark-Level Linear $\sigma$ Model (QLL$\sigma$M) leadsto a prediction for the diamagnetic term of the polarizabilities of the nucleonwhich is in excellent agreement with the experimental data. The bare mass ofthe $\sigma$ meson is predicted to be $m_\sigma=666$ MeV and the two-photonwidth $\Gamma(\sigma\to\gamma\gamma)=(2.6\pm 0.3)$ keV. It is argued that themass predicted by the QLL$\sigma$M corresponds to the $\gamma\gamma\to\sigma\toNN$ reaction, i.e. to a $t$-channel pole of the $\gamma N\to N\gamma$ reaction.Large -angle Compton scattering experiments revealing effects of the $\sigma$meson in the differential cross section are discussed. Arguments are presentedthat these findings may be understood as an observation of the Higgs boson ofstrong interaction while being part of the constituent quark.

Observation of the Higgs Boson of strong interaction via Compton scattering by the nucleon