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In his 1964 paper, Murray Gell-Mann proposed fractional-charge quarks, constructing baryons and mesons from them. He also distinguished a mathematical constituent model from the hypothesis of finite-mass physical particles. The successful bookkeeping did not itself settle that distinction.^[ref]

George Zweig's 1964 CERN model used three constituents called aces, with fractional electric charge and baryon number $1/3$. Its abstract also proposed an experimental search.^[ref] The theoretical construction and the experiment that might discriminate between interpretations are separate parts of the argument. The Omega baryon discovery experiment illustrates the power of testing an incomplete particle pattern against new observations.

George Zweig proposed a constituent organization of hadrons in 1964, calling the constituents aces. Combining their quantum numbers accounts for patterns among mesons and baryons, connecting the larger observed particle families to a smaller set of building blocks. His model supplied a physical way to interpret flavor symmetry and the relative suppression of some reactions, rather than treating the multiplets only as numerical classifications. The constituent proposal was independent of the later experimental identification of quark substructure.^[ref]

A physicist whose research includes mathematical models of wave propagation and experimental tests of those models.^[ref]