Chiral color symmetry and $G'$-boson mass limit from Tevatron data on $t \bar t$-production

TL;DR

This paper investigates a chiral color symmetry model predicting a $G'$-boson, analyzing its effects on top quark pair production at Tevatron, and constrains its mass and mixing angle based on experimental data.

Contribution

It provides the first detailed analysis of the $G'$-boson effects on $tar{t}$ production and derives constraints on its mass and mixing angle from Tevatron data.

Findings

$G'$-boson contributions are consistent with Tevatron data.

Allowed $G'$ mass around 1.2 TeV with a mixing angle of 14°.

Region of 1σ consistency identified in parameter space.

Abstract

A gauge model with chiral color symmetry of quarks is considered and possible effects of the color $G'$-boson octet predicted by this symmetry are investigated. The contributions of the $G'$-boson 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 and 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.