Possible evidence for quark substructure from electron-positron colliding-beam experiments

By endowing quarks with a size and a small anomalous magnetic moment, it is shown that the rise in the ratio ${{σ}({e}⁺{e}^{{-}}{→}allhadrons)}{{σ}({e}⁺{e}^{{-}}{→}{{μ}}⁺{{μ}}^{{-}})}$ with center-of-mass energy can be simply explained while leaving the observed scaling phenomenon in deep-inelastic electron scattering intact. Speculations and tests of the model are discussed.