Parameter-Independent Quark Mass Relation in the U(3)$\times$U(3)$'$ Model

TL;DR

This paper explores a U(3)×U(3)' family symmetry model that derives a parameter-independent relation among quark masses, using only a few parameters and charged lepton masses as inputs.

Contribution

It demonstrates a novel parameter-independent quark mass relation within a family symmetry model, based on minimal parameters and specific trace and determinant conditions.

Findings

Derived a parameter-independent quark mass relation.

Showed the relation's consistency with observed quark masses.

Utilized charged lepton masses as input to predict quark properties.

Abstract

Recently, we have proposed a quark mass matrix model based on U(3)$\times$U(3)$'$ family symmetry, in which up- and down-quark mass matrices $M_u$ and $M_d$ are described only by complex parameters $a_u $ and $a_d $, respectively. When we use charged lepton masses as additional input values, we can successfully obtain predictions for quark masses and Cabibbo-Kobayashi-Maskawa mixing. Since we have only one complex parameter $a_q$ for each mass matrix $M_q$, we can obtain a parameter-independent mass relation by using three equations for ${\rm Tr}[H_q]$, ${\rm Tr}[H_q H_q]$ and ${\rm det}H_q$, where $H_q \equiv M_q M_q^\dagger$ ($q=u, d$). In this paper, we investigate its parameter-independent feature of the quark mass relation in the model.