Probing the Z′ sector of the minimal B-L model at future Linear Colliders in the e +e - μ +μ - process

Abstract

We study the capabilities of future electron-positron Linear Colliders, with centre-of-mass energy at the TeV scale, in accessing the parameter space of a Z′ boson within the minimal B-L model. In such a model, wherein the Standard Model gauge group is augmented by a broken U(1) B-L symmetry - with B(L) being the baryon(lepton) number - the emerging Z′ mass is expected to be in the above energy range. We carry out a detailed comparison between the discovery regions mapped over a two-dimensional configuration space (Z′ mass and coupling) at the Large Hadron Collider and possible future Linear Colliders for the case of di-muon production. As known in the literature for other Z′ models, we confirm that leptonic machines, as compared to the CERN hadronic accelerator, display an additional potential in discovering a B-L Z′ boson as well as in allowing one to study its properties at a level of precision well beyond that of any of the existing colliders. © 2009 SISSA.