Spinless-dyon models of composite leptons and quarks

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This paper includes the following. (1) A general opinion on the study of the possible compositeness of leptons and quarks. Practices as to set many specific standards of naturalness before the understanding of the dynamics are pondered. (2) Two composite models with scalar preons (all preons are dyons of a hidden U(1)/sub s-italic/) are introduced. We concentrate on one with six preons T-italic/sup a-italic/, T-italic/sup b-italic/, T-italic/sup c-italic/ and V-italic/sup a-italic/, V-italic/sup b-italic/, V-italic/sup c-italic/, where a-italic, b-italic, and c-italic are three different U(1)/sub s-italic/ dyon charges carried by preons. Their values are not arbitrary in order to match their fundamentalness. T-italic and V-italic are differentiated by a mass difference. Leptons and quarks consist of three preons; vector bosons and Higgs bosons consist of six preons due to a force similar to the covalent bound between hydrogen atoms in an H/sub 2/ molecule. Possible multiplets are given in a table. The symmetry of the composite system is SU(4) x SU(2)/sub L-italic/ x SU(2)/sub R-italic/ x U(1)/sub F-italic/. (3) The symmetry-breaking pattern of the model is basically fixed by requiring that exact degeneracies and symmetry survive to the maximal extent. (4) The slow rate of proton decay and e-italic, ..mu.. universalitymore » are reached. The Kobayashi-Maskawa matrix is discussed. (5) Vector bosons other than gauge bosons are predicted. W-italic/sub L-italic//sup '/ and W-italic/sub R-italic//sup '/ interact with leptons 3 times stronger than with quarks. (6) Problems and uncertainties in the models, once met, are explicitly discussed.« less