Search

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 structure of elementary particles whose characters are 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 exchnge 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 discussion are given on the energy dependence of the exchange backward peak and on the related hard core problem.

An attempt is given, which aims at representing the fundamental laws of weak interactions as conservation laws instead of conventional violation laws. We assume that the conserved quantities characteristic to weak interactions are anti-commutable with those characteristic to strong interactions. All weak interactions are assumed to occur via intermediate boson, which is assumed to belong to an eigenstate of the conserved quantity for weak interactions. V - A law is derived in this way by adoptin the chirality as one of the conserved quantities. We adopt also as an conserved quantity the iso-chirality which is defined tobe an operator anti-commutable with the iso-parity. Then isospin and hypercharge are not conserved, and |ΔI| = 1/2 rule is derived using weak current composed of bilinear forms of quarks. The Cabibbo angle appears natrally in the general definition of the iso-chirality operator. Also briefly discussed is a possible scheme of leptonic interaction, which satisfies the three conditions; |ΔI | = 1/2 rule for hadronic processes, nonn-appearance of neutral lepton currents and universality of coupling constants in the primary interaction between intermediate bosons and weak currents.

As described in Part I, Taketani, Nakamura, and Sasaki proposed that the outer region of the nuclear potential can be treated substantialistically and the inner region phenomenologically, and much progress has been done since the proposal. In the present Part III we shall, therefore, show how the region where the nuclear potential derived from the present pion theory is reliable has been established.