On mass limit for chiral color symmetry $G'$-boson from Tevatron data on $t \bar{t}$ production

TL;DR

This paper investigates the impact of a hypothetical $G'$-boson, predicted by chiral color symmetry, on top quark pair production at the Tevatron, analyzing how it fits experimental data and constrains its mass and mixing angle.

Contribution

It provides a detailed analysis of the $G'$-boson effects on $tar{t}$ production observables, identifying parameter regions consistent with experimental data.

Findings

$G'$-boson contributions align with Tevatron data on cross section and asymmetry.

Allowed $G'$ mass around 1.2 TeV with a mixing angle near 14 degrees.

Parameter space constraints are derived from data compatibility.

Abstract

The contributions of $G'$-boson predicted by the chiral color symmetry of quarks to the cross section $\sigma_{t\bar{t}}$ and to the forward-backward asymmetry $A_{\rm FB}^{p \bar p}$ of $t\bar{t}$ production at the Tevatron are calculated with account of the difference of the strengths of the $\bar q q G$ and $\bar q q G'$ interactions. The results are analysed in dependence on two free parameters of the model, the mixing angle $\theta_G$ and $G'$ mass $m_{G'}$. The $G'$-boson contributions to $\sigma_{t\bar{t}}$ and $A_{\rm FB}^{p \bar p}$ are shown to be consistent with the Tevatron data on $\sigma_{t\bar{t}}$ and $A_{\rm FB}^{p \bar p}$, the allowed region in the $m_{G'} - \theta_G$ plane is discussed and around $m_{G'}=1.2 \, TeV, \; \theta_G=14^\circ $ the region of $1 \sigma$ consistency is found.