Nonstandard, strongly interacting spin one $t \bar t$ resonances

TL;DR

This paper investigates nonstandard, strongly interacting spin-1 resonances like axigluons and colorons, analyzing their effects on top-antitop production and asymmetries at Tevatron and LHC, providing constraints and detection strategies.

Contribution

It offers new constraints on axigluon and coloron masses from Tevatron data and proposes methods to distinguish these resonances at LHC using asymmetries and polarization.

Findings

Tevatron constraints on resonance masses are competitive with dijet data.

Expected forward-backward asymmetry can discriminate axigluons from the Standard Model.

Top polarization can help differentiate axigluons and colorons at the LHC.

Abstract

Examining theories with an extended strong interaction sector such as axigluons or flavour universal colorons, we find that the constraints obtained from the current data on $t \bar t$ production at the Tevatron are in the range of $\sim {\cal O}$ TeV and thus competitive with those obtained from the dijet data. We point out that for large axigluon/coloron masses, the limits on the coloron mass may be different than those for the axigluon even for $\cot \xi = 1$. We also compute the expected forward-backward asymmetry for the case of the axigluons which would allow it to be discriminated against the SM as also the colorons. We further find that at the LHC, the signal should be visible in the $t \bar t$ invariant mass spectrum for a wide range of axigluon and coloron masses that are still allowed. We point out how top polarisation may be used to further discriminate the axigluon and coloron case from the SM as well as from each other.