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The significant excess of events recently found by the H1 and ZEUSCollaborations at HERA in the deep-inelastic e^+ p scattering for highmomentum-transfers squared Q^2>15000 GeV^2 over the expectation of the standardmodel can be explained by either one of the following possible consequences ofthe substructure of quarks and leptons: 1) production of leptoquarks (Phi), 2)exchange of an excited Z boson (Z'), 3) intrinsic form factors of quarks (orleptons), 4) intrinsic anomalous magnetic moments of quarks, 5) production ofexcited quarks (q^*), and 6) that of excited positrons (e^*+). The masses ofthese new particles are estimated to be m(Phi) = 280-440 GeV, m(Z') = 210-250GeV, m(q^*) = 120-140 GeV, and m(e^*+) = 300-370 GeV, although thepossibilities 2) and 5) are excluded by the currently available experimentalconstraints.Comment: 7 pages, revtex, 2 Postscript figure

Has the substructure of quarks and leptons been found also by the H1 and ZEUS detectors at DESY HERA?