Stueckelberg model and Composite Z'

TL;DR

This paper explores a composite Z' model that naturally incorporates the Stueckelberg mechanism, predicting unique mass relations and potential experimental signatures indicating Z' compositeness.

Contribution

It demonstrates how a composite Z' model can effectively realize the Stueckelberg mechanism and determines scalar and neutrino masses via infrared fixed points.

Findings

Composite Z' mass includes Stueckelberg term

Scalar and neutrino masses set by infrared fixed points

Large gauge coupling could indicate Z' compositeness

Abstract

Based on Ref.[1], we study a composite Z' model which effectively induces the Stueckelberg model in low energy. It turns out that the mass of the composite Z' boson contains the Stueckelberg mass term in sharp contrast to the conventional Z' model. We also find that the masses of the composite scalar and the right-handed neutrinos are determined by the infrared fixed points. If future experiments confirm that the gauge coupling g of Z' is sufficiently large, say, $g^2/(4\pi) > 0.015$ for the U(1)_{B-L} model, and also establish the existence of the Stueckelberg mass term for Z', it might be evidence of the compositeness of Z'.