Stueckelberg model and Composite Z'

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'.