Mass-matrix ansatz and constraints on $B_{s}^{0}-\bar{B}_{s}^{0}$ mixing in 331 models

TL;DR

This paper constrains the mass of the hypothetical Z' boson in 331 models by comparing theoretical predictions and experimental measurements of the B_s meson mass difference, considering various quark mass matrix textures.

Contribution

It provides lower bounds on the Z' boson mass in 331 models using mass difference data and zero-texture quark mass matrices, extending previous constraints.

Findings

Lower bounds on Z' mass range from 1 TeV to 30 TeV.

Constraints depend on the chosen zero-texture ansätze.

Results are expressed as functions of the weak angle related to b-s-Z' couplings.

Abstract

Comparing the theoretically predicted and measured values of the mass difference of the $B^{0}_{s}$ system, we estimate the lower bound on the mass of the $Z^{\prime}$ boson of models based on the $SU(3)_{c} \otimes SU(3)_{L} \otimes U(1)_X$ gauge group. By assuming zero-texture approaches of the quark mass matrices, we find the ratio of the measured value to the theoretical prediction from the Standard Model and the $Z^{\prime}$ contribution from the 331 models of the mass difference of the $B^{0}_{s}$ system. We find lower bounds on the $Z^{\prime}$ mass ranging between 1 TeV and 30 TeV for the two most popular 331 models, and four different zero-textures ans\"atze. The above results are expressed as a function of the weak angle associated to the $b-s-Z^{\prime}$ couplings.