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

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 ($Z^{\prime }$) research at LHC. We derive a relation between the $Z-Z^{\prime }$ 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.

Comments: 3 figures, 4 tables. Figures 1 and 2 were replaced by updated plots