- #36
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Well, the difference between this example and the question, where the mass of the nucleon comes from, is that the latter question is not completely answered yet. It's the notorious problem to understand "confinement" from first principles (in this case quantum chromodynamics, QCD). We are pretty sure about the statement that the nucleon mass (and the masses of the other hadrons) is due to the strong interaction is from lattice-QCD calculations, i.e., numerical evaluations of QCD, leading to a satisfactory description of the hadronic mass spectrum.