Universality of Strength of Yukawa Couplings, Quark Singlets and Strength of CP Violation

TL;DR

This paper investigates how the universality of Yukawa coupling strength can explain the observed quark mass hierarchy, mixing, and CP violation in an extended standard model with an additional vector-like quark.

Contribution

It demonstrates that the universality hypothesis can account for the quark mass spectrum, mixing angles, and CP violation within a model including a new vector-like quark.

Findings

Reproduces observed quark mass hierarchy

Matches experimental CP violation strength

Supports universality of Yukawa couplings hypothesis

Abstract

We analyse the strength of CP violation in an extension of the standard model with an extra $Q=-1/3$ vector-like singlet quark, in the framework of the hypothesis of universality of strength of Yukawa couplings connecting standard quarks. We show that the correct pattern of quark masses and mixing can be obtained, including the observed strength of CP violation.