Four-Element Theory of Nature and Two-Flavor Multi-Excitation Model of Quark

A two-flavor (up and down) multi-excitation (ground and excited) quark model is developed based on the author's well-developed four-element theory of nature. In this new quark model, the charm, strange, top, and bottom quarks are the second and third excited states of up and down quarks. Since a quark is a combination of threes of the four fundamental elements (i.e., mass, electric charge, and color charges), the extremely short-range weak force, as it is an interaction between electric and color charges, occurs effectively inside quark and causes quark relaxation (or decay) and excitation via emitting and absorbing a quark-antiquark pair. Leptons are products rather than direct participants of weak interactions. A quark has eight possible ways of combinations/annihilations in maximum with an antiquark to form various particles including mesons, leptons, gluons, and photons. Previous studies have shown formations of four generation leptons via charge annihilations of the ground and first excited up and down quarks and illustrated oscillations of neutrinos and fine structures of Feynman diagrams for beta decays of quarks. Recent studies further give formations of many more particles possibly formed from various combinations of up and down quarks up-to the third excited states. Particles currently observed in nature and discovered from labs are only a tiny part of possibly formed ones according to this new quark model. This presentation overviews our previous studies and presents results recently obtained.