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QCD Made Simple
Figure 2 Mass spectrum of mesons and baryons, as predicted by QCD and intensive number-crunching.5 Only two adjustable parameters went into this calculation: the coupling strength and the strange-quark mass (by way of the K or f meson, both of which incorporate strange quarks). The up- and down-quark masses can be approximated by zero. Solid dots are for calculations tied to the measured K mass; open dots are tied to the f mass. The agreement with the measured masses (red lines) is at the 10% level. Such calculations are improving as computer power and techniques get better.
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