Elementary Particle Structures and Meson-Nucleon Backward Scatterings

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Within the framework of the composite particle model, some meson-nucleon large angle scatterings at high energies are qualitatively discussed as the rearrangement collision among constituent particles of meson and nucleon. The purpose is to see the dynamical structures of elementary particles whose characters are never clarified only by the fashionable symmetry argument. In this note the two types of models with the same symmetry are investigated: (i) the "atom-type" of models in which all mesons and baryons are, in the same level, composed of a small number of urbaryons, and (ii) the "molecule-type"of models in which only (all or some) baryons are composed of urbaryons but the other particles (mainly mesons) are composed of the baryons. The backward peaks in the angular distribution of meson-nucleon scatterings may be understood as the exchange effect, since the scatterings are analogous to the deuteron-proton scattering in the "molecule-type" of models and to the deuteron-triton scattering in the "atom-type" of model. From this point of view, the two sets of predictions are, correspondingly to the above two types of model, obtained about appearance of the exchange backward peaks in various meson-nucleon scatterings at high energies. The existing experiments on π^±p→π^±p at 4 GeV and 8 GeV seem to prefer the "molecule-type" of models. Finally discussions are given on the energy dependence of the exchange backward peak and on the related hard core problem.
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Elementary Particle Structures and Meson-Nucleon Backward Scatterings

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