Heavy colored resonances in top-antitop + jet at the LHC

TL;DR

This paper explores the potential to detect heavy color-octet vector resonances in top-antitop+jet events at the LHC by analyzing charge asymmetries, especially in models with extra dimensions.

Contribution

It introduces a method to identify signals of heavy color-octet resonances via charge asymmetry in top-antitop+jet events, highlighting effects from extra-dimensional models.

Findings

Significant statistical significance for asymmetry measurement at low energies.

Asymmetry contributions include terms proportional to the color factor f_{abc}^2.

Detection prospects are promising across various coupling constants.

Abstract

The LHC is the perfect environment for the study of new physics in the top quark sector. We study the possibility of detecting signals of heavy color-octet vector resonances, through the charge asymmetry, in top-antitop+jet events. Besides contributions with the top-antitop pair in a color-singlet state, the asymmetry gets also contributions which are proportional to the color factor f_{abc}^2. This process is particularly interesting for extra-dimensional models, where the inclusive charge asymmetry generated by Kaluza-Klein excitations of the gluon vanishes at the tree level. We find that the statistical significance for the measurement of such an asymmetry is sizable for different values of the coupling constants and already at low energies.