Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-04-15
Phys.Rev.D56:2490-2494,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, revtex, 2 Postscript figures
Scientific paper
10.1103/PhysRevD.56.R2490
The significant excess of events recently found by the H1 and ZEUS Collaborations at HERA in the deep-inelastic e^+ p scattering for high momentum-transfers squared Q^2>15000 GeV^2 over the expectation of the standard model can be explained by either one of the following possible consequences of the substructure of quarks and leptons: 1) production of leptoquarks (Phi), 2) exchange of an excited Z boson (Z'), 3) intrinsic form factors of quarks (or leptons), 4) intrinsic anomalous magnetic moments of quarks, 5) production of excited quarks (q^*), and 6) that of excited positrons (e^*+). The masses of these new particles are estimated to be m(Phi) = 280-440 GeV, m(Z') = 210-250 GeV, m(q^*) = 120-140 GeV, and m(e^*+) = 300-370 GeV, although the possibilities 2) and 5) are excluded by the currently available experimental constraints.
Akama Keiichi
Katsuura Kazuo
Terazawa Hidezumi
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