Hironari Miyazawa

Mesic Correction to the Beta-Decay in a Nucleus

Mesic corrections to beta decay interactions in a nucleus are investigated. It is found that the GamowTeller coupling constant should apparently become about 8% smaller by exchanging pions among nucleons. Also the mesic effect in the l-forbidden case is discussed. (auth)

High Energy Scattering and Hadron Structure

High energy proton-proton scattering is analyzed using the geometrical impact parameter representation. Assuming that the proton is a composite state of quarks, whose distribution within the proton is expressed by the electromagnetic form factors, the quark-quark scattering amplitude is obtained. The analyses indicate that the proton is made of almost structureless particles. (auth)

On the Strong Interaction

A series of equations is proposed for the description of strong hyperon- meson interactions, in which the global symmetry theory is rejected. (D.L.C.)

Dispersion Relations in Nucleon-Nucleon Scattering

Two-pion contribution to ihe absorptive part of nucleonnucleon scattering amplitudes in the unphysical region is calculated using the dispersion relation for pion-nucleon scattering. The dispersion relations with this absorptive part are used for analyzing nucleon-nucleon scattering data at low energy and at moderate energy, and good agreement is obtained when the coupling constant is chosen as f/sup 2/4 tion = 0.08 combination rat 0.01. (auth)

Superalgebra and fermion-boson symmetry.

Fermions and bosons are quite different kinds of particles, but it is possible to unify them in a supermultiplet, by introducing a new mathematical scheme called superalgebra. In this article we discuss the development of the concept of symmetry, starting from the rotational symmetry and finally arriving at this fermion-boson (FB) symmetry.

Three‐Nucleon Force, Fifty Years Ago

The three‐body nuclear force was calculated fifty years ago. This talk will describe how and why it was introduced and what the status of pion theory was at that time.

Superstring theory as seen through an old man's eyes

Is the superstring theory an ultimate theory to replace the quantized field theory? Is it physics or mathematics? An old mans point of view of the superstring theory is given.

Large Angle Diffraction Scattering

The facts that all the hadron cross sections tend to constant values at high energy and that forward scattering amplitudes are dominantly imaginary, suggest that a scatterer behaves as a rigid absorber of a definite size. This geometrical picture is in accord with non-shrinking of the diffraction peaks with slopes almost equal to 1/ R2 (R being the radius) and independent of the incident energy. In this note we shall calculate the amplitude for diffraction scattering due to absorption on this geometrical approach (i.e. in the x-representation rather than in the p-representation), and try to interpret the characteristic features of the elastic differential cross section. At extreme high energy, this picture should furnish a better approximation than the one based on the exchange of a number of particles or of Reggeons. We consider a spin-conserving elastic channel 111 the center of mass system. The wave function of the incident particle satisfies