Shuzo Ogawa

A Possible Symmetry in Sakata's Model for Bosons-Baryons System. III

In the full symmetry theory a physical system can be characterized by six quantum numbers. Following the original intention of the composite model, an attempt is made to replace these quantum numbers by others that are easier to understand by intuition. This study leads to a new picture of the particle, which contrasts with the usual picture in the perturbation theoretical treatment. The realistic aspects developed not only promote a deeper understanding of the full symmetry theory of the composite model, but also throw a new light on the structure of elementary particles. (auth)

A Possible Symmetry in Sakata's Composite Model

In Sakatas model of strongly interacting particles, it is assumed that the proton, neutron, and LAMBDA -particles are the basic particles which combine in various manners to make up mesons and other baryons. A certain quality which exists among these three particles is investigated. The view is taken that there exists a certain origin of the mass of the particle which can never be redueed to the self-action of the usual interactions. The symmetry of the interaction among the three basic particles is of primary importance and charge independence has a secondary meaning. (A.C)

A Possible Interpretation of the New Event in the Cosmic Ray Experiment. II

In a previous paper we have analysed a new event observed by Niu and others in cosmic ray experiments, and have been able to present a reasonable interpretation of it on the basis of the new (modified) Nagoya model for urbaryons. Anticipating the accumulation of such new events, we shall give a further study in this paper, especially about the details of weak decay processes which were not fully developed in the previous work.

On the Universality of the Weak Interaction

With the aim to understand the weak interactions occurring in nature from the unified point of vtew, we shall propose one possible model in thts note. In our model, new charged Bose fields are mtroduced and are assumed to interact universally with all Fermi parttcles. We shall also discuss about the difference between ours and the other view-point in which all weak interactions are assumed to come from the untversal Fermi interaction.

On the Competition between Decay and Capture of the Unstable Particles due to the Weak Interactions

In the transmutation processes of the unstable particles, some universal interactions seem to be recognized. In this note we examine the competition caused by these interactions between the decay and the nuclear capture of the unstable particles, when they stop in dense material. The competition is also investigated by the use of the assumed interactions in the case where the unstable particle is known to decay mto n-mesons, though we have got little information on the nature of its interactions. It is found that negatively charged r-meson, when brought into K -orbit of the heavy nucleus, is very likely to be absorbed by the nucleus before decaying. It is also noted that there is a certain correlation among the numerical values of the coupling constants of the weak interactions above introduced.

On the anomalous magnetic moment of μ-mesons

SummaryFrom the analysis of the cosmic ray bursts produced by μ-mesons, the upper limit of the magnitude of the anomalous magnetic moment of μ-mesons is estimated. As a result, the anomalous magnetic moment of μ-mesons is found to be smaller than 80 percent of the normal Dirac moment.RiassuntoDall’analisi dei burst di raggi atoniici prodotti da mesoni μ si stima il limite superiore della grandezza del momento magnetico anomalo dei mesoni μ. Si trova che il momento magnetico anomalo dei mesoni μ è dell’80 % inferiore al momento normale di Dirac.

Chapter 2. The Full Symmetry Theory of the Sakata Model

A possible symmetry among the basic particles in the Sakata model is studied. A theory is developed which incorporates such a symmetry in a satisfactory way. Theoretical predictions are compared with experimental information. Some speculations are also made for further progress.

On Selection Rule of Weak Processes and Decays of New Particles. II

Following a previous paper, we propose s~lection rules for weak processes. The first rule is .1n1=0, where n,=n+n; n(n) indicates an (anti-)urbaryon number. The second rule is that a dimensionality of the SU(3) representation of hadronic system is conserved along sor t-channel dependig on the parity property. These rules are applied to decay processes of new hadrons,_an indication of which has -been observed in a cosmic ray jet. We further attempt some conjectures on the second event that has recently been reported.

Implications of Four-Quark Scalar Mesons with Charm

The possibility of the existence of four-quark scalar mesons with charm 15+( cuud) and 15°( cd ud) is studied in the framework of 5 U( 6 )cs, a combined symmetry of color and spin, with a binding potential due to a gluon magnetic interaction. We observe that the masses of the mesons range from 1.8 Ge V to 2.4 Ge V and that the mesons are produced dominantly in the forward region by neutrino reactions. If the masses of 15 were smaller than mD+ m~, the mesons will be stable and the lifetimes will be the same order in magnitude with those of D mesons. Thus detection of a dual structure in mass and lifetime for charmed mesons, and of a decay 15--> D+2r with an appreciable (at least a few percent) branching ratio will provide a confirmation of the existence of the four-quark scalar mesons.

On the Generalization of the Urbaryon Model Based on Lepton-Pairs

the shortcomings of the model proposed by Koide and two of the ~uthors (T. H. and S. 0.), and it is shown that the simply extended ones of the original model are most favourable. The case is also examined when the leptonic neutral currents exist. Further discussion is given about KL-7/Lil decay.