Constraints on 3-3-1 models with electroweak Z pole observables and Z' search at LHC

TL;DR

This paper evaluates constraints on 3-3-1 models using updated electroweak Z pole data, atomic parity violation, and LHC Z' searches, identifying excluded scenarios and relations between model parameters.

Contribution

It provides a comprehensive global fit of 3-3-1 models to electroweak data, linking Z-Z' mixing with model parameters and excluding certain exotic particle scenarios.

Findings

Certain 3-3-1 models are largely excluded by electroweak precision data.

A relation between Z-Z' mixing angle and tan(β) is derived.

Models with exotic electric charges are disfavored by electroweak observables.

Abstract

In the framework of general 3-3-1 models, we perform a global $\chi ^2$ fit at $95\%$ C.L. to the updated Z pole observables, including new data from atomic parity violation. We found scenarios where specific realizations of 3-3-1 models are largely excluded above the current limit on the extra neutral gauge boson ($Z'$) research at LHC. We derive a relation between the $Z-Z'$ mixing angle and the parameter $\tan(\beta)$ of the effective Two-Higgs-Doublet Model contained into the 3-3-1 spectrum. We show that particular versions of 3-3-1 models containing particles with exotic electric charges are disfavored by the electroweak precision observables in an ample region of the parameter space.