Chiral color symmetry and $G^{\prime }$-boson mass limit from Tevatron data on $t\bar{t}$-production

Abstract

A gauge model with chiral color symmetry of quarks is considered and possible effects of the color $G^{\prime }$-boson octet predicted by this symmetry are investigated. The contributions of the $G^{\prime }$-boson to the cross section ${\sigma }_{t\bar{t}}$ and to the forward-backward asymmetry $A_{\mathrm{FB}}^{p\bar{p}}$ 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 $G^{\prime }$ mass $m_{G^{\prime }}$. The $G^{\prime }$-boson contributions to ${\sigma }_{t\bar{t}}$ and $A_{\mathrm{FB}}^{p\bar{p}}$ are shown to be consistent with the Tevatron data on ${\sigma }_{t\bar{t}}$ and $A_{\mathrm{FB}}^{p\bar{p}}$, the allowed region in the $m_{G^{\prime }}-{\theta }_G$ plane is discussed and around $m_{G^{\prime }}=1.2TeV,{\theta }_G=14^{\circ }$ the region of $1\sigma$ consistency is found.

Comments: 7 pages, 1 figure. Submitted to Proceedings of the 16th International Seminar on High Energy Physics "QUARKS-2010", Kolomna, Russia, 6-12 June, 2010. Misprints in formula (8) are corrected. All the other results are valid