The Bi-Spinor Standard Model with 3 Generations

TL;DR

This paper proposes that in a bi-spinor version of the Standard Model with four generations, only three are observable due to mass degeneracy, and it better fits flavor mixing data than the traditional Standard Model.

Contribution

It introduces a bi-spinor Standard Model framework with four generations and demonstrates its consistency with electroweak data and flavor textures.

Findings

Only three generations are observable due to mass degeneracy.

Bi-spinor Standard Model matches electroweak precision variables as well as the Standard Model.

It provides a better fit to flavor mixing textures than the conventional Standard Model.

Abstract

We show that if two of four generations of the bi-spinor Standard Model are mass-degenerate or sufficiently close in mass only three generations can be observed. We argue that the Standard Model and its bi-spinor analog are indistinguishable on the level of the electroweak precision variables S, T, U. As a result the bi-spinor Standard Model, which describes experimental observed textures of flavor mixing matrices is a better fit to the data then the Standard Model, where the textures are arbitrary.