Constraining heavy colored resonances from top-antitop quark events

TL;DR

This paper investigates how measurements of top-antitop quark events at Tevatron can constrain the properties of hypothetical heavy colored resonances, such as axigluons and colorons, to reconcile experimental data with theoretical models.

Contribution

It introduces a method to use charge asymmetry and invariant mass distributions to set bounds on the mass and couplings of massive color-octet gauge bosons.

Findings

Charge asymmetry measurements challenge flavor universal axigluons and colorons at 2 sigma.

Constraints on mass and couplings of color-octet gauge bosons are derived.

Potential to reconcile experimental data with new physics models.

Abstract

Recent measurements of the top quark charge asymmetry at Tevatron disfavor the existence of flavor universal axigluons and colorons at 2 sigmas. In this letter we explore the possibility to reconcile the data with these models and use the charge asymmetry and the invariant mass distribution of top-antitop quark pair events to constrain the mass and couplings of massive color-octet gauge bosons decaying to top quarks.