Minimal Z' models and the 125 GeV Higgs boson

TL;DR

This paper analyzes minimal Z' models with a type-I seesaw mechanism using 1-loop renormalization group equations, focusing on Higgs boson properties and scalar mixing angles post-125 GeV discovery.

Contribution

It provides a detailed RG analysis of minimal Z' models, highlighting favored negative scalar mixing angles and bounds on heavy neutrino masses based on the singlet scalar VEV.

Findings

Negative scalar mixing angles are favored.

Existence of a minimum scalar mixing angle.

Bounds on heavy neutrino masses depending on singlet VEV.

Abstract

The 1-loop renormalization group equations for the minimal Z' models encompassing a type-I seesaw mechanism are studied in the light of the 125 GeV Higgs boson discovery. This model is taken as a benchmark for the general case of singlet extensions of the standard model. The most important result is that negative scalar mixing angles are favoured with respect to positive values. Further, a minimum value for the latter exists, as well as a maximum value for the masses of the heavy neutrinos, depending on the vacuum expectation value of the singlet scalar.