Discovery and Identification of W' and Z' in SU(2) x SU(2) x U(1) Models at the LHC

TL;DR

This paper assesses the discovery potential of W' and Z' bosons in SU(2) x SU(2) x U(1) models at the LHC, considering existing constraints and different symmetry breaking patterns, and finds limited prospects for detection.

Contribution

It analyzes the LHC discovery potential for W' and Z' bosons in specific gauge models, incorporating low energy constraints and exploring two symmetry breaking scenarios.

Findings

Detection probability is limited by low energy constraints.

Observing Z' without W' does not exclude certain models.

Degenerate W' and Z' bosons could be discovered in BP-II.

Abstract

We explore the discovery potential of W' and Z' boson searches for various SU(2) x SU(2) x U(1) models at the Large Hadron Collider (LHC), after taking into account the constraints from low energy precision measurements and direct searches at both the Tevatron (1.96 TeV) and the LHC (7 TeV). In such models, the W' and Z' bosons emerge after the electroweak symmetry is spontaneously broken. Two patterns of the symmetry breaking are considered in this work: one is SU(2)_L x SU(2)_2 x U(1)_X to SU(2)_L x U(1)_Y (BP-I), another is SU(2)_1 x SU(2)_2 x U(1)_Y to SU(2)_L x U(1)_Y (BP-II). Examining the single production channel of W' and Z' with their subsequent leptonic decays, we find that the probability of detecting W' and Z' bosons in the considered models at the LHC (with 14 TeV) is highly limited by the low energy precision data constraints. We show that observing Z' alone, without seeing a W', does not rule out new physics models with non-Abelian gauge extension, such as the phobic models in BP-I. Models in BP-II would predict the discovery of degenerate W' and Z' bosons at the LHC.