Z' signals in polarised top-antitop final states

TL;DR

This paper investigates how different observables in top-antitop production at the LHC can be used to identify the nature of a Z' boson, considering full background effects and interferences.

Contribution

It demonstrates that combining differential mass spectra and asymmetries can distinguish between various Z' models at the LHC.

Findings

Differential spectra and asymmetries can differentiate Z' models.

Exploiting multiple observables enhances model discrimination.

Realistic reconstruction efficiencies are considered.

Abstract

We study the sensitivity of top-antitop samples produced at all energy stages of the Large Hadron Collider (LHC) to the nature of an underlying Z' boson, in presence of full tree level standard model (SM) background effects and relative interferences. We concentrate on differential mass spectra as well as both spatial and spin asymmetries thereby demonstrating that exploiting combinations of these observables will enable one to distinguish between sequential Z's and those pertaining to Left-Right symmetric models as well as E6 inspired ones, assuming realistic final state reconstruction efficiencies and error estimates.