Gluon excitations in t tbar production at hadron colliders

TL;DR

This paper proposes a light massive gluon model with specific couplings that can explain the Tevatron's top quark forward-backward asymmetry without conflicting with existing collider data, and predicts its observability at the LHC.

Contribution

It introduces a realistic Higgsless warped extra dimension model that naturally produces the required gluon properties to match experimental asymmetry observations.

Findings

A light gluon with mass <= 1 TeV can explain the asymmetry.

Such gluons are detectable at the LHC with 300 pb^{-1} luminosity.

Current data cannot exclude these gluons at 850 GeV.

Abstract

We argue that a relatively light massive gluon with mass <= 1 TeV, small purely axial couplings to light quarks and sizable vector and axial couplings to the top quark can reproduce the large forward-backward asymmetry observed at the Tevatron without conflicting with the t tbar and the dijet invariant mass distributions measured at the Tevatron and the LHC. We show that realistic Higgsless models with warped extra dimensions naturally fulfil all the necessary ingredients to realize this scenario. While current data is unable to discover or exclude these heavy gluons with masses 850 GeV, they should be observed at the (7 TeV) LHC with a luminosity of the order of 300 pb^{-1}.