Abstract
Evidence supporting the idea of quarks as the hadronic constituents has been strengthening since they were first proposed by Gell-Mann and Zweig in the 1960’s. In particular there are the successes of the SU(3) symmetry scheme. Hadrons of the same spin and parity form multiplets each of which corresponds to an irreducible representation of SU(3). Experimentally the multiplets are observed to be octets, decuplets, and singlets, whereas the fundamental representation of SU(3) is a triplet. Therefore the simplest picture of hadrons is to build them as bound states of triplet quarks from which they derive their individual quantum numbers of electric charge, strangeness, etc.
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