Eur. Phys. J. C (2008) 54: 547-553
https://doi.org/10.1140/epjc/s10052-008-0557-y

Regular Article - Theoretical Physics

Signals of universality violation in e⁺e^- collisions

Department of Physics, Umm Al-Qura University, Makkah, Saudi Arabia

^* e-mail: bagneid@yahoo.com

Received: 26 April 2007
Revised: 22 January 2008
Published online: 8 March 2008

Abstract

We examine distributions of leptons produced in e⁺e^- collisions, by a family nonuniversal extra gauge boson Z^′, suggested by the model, and by other neutral gauge bosons occurring in left–right symmetric models and in superstring-inspired E₆ models. We discuss how to distinguish the models by examining the couplings to fermions of the extra Z-boson through its leptonic production cross sections and asymmetries. We show how the universality violation inherent in the model enhances the discovery potential of Z^′ at future planned and proposed e⁺e^- colliders.