The chiral color symmetry of quarks and $G^{\prime }$-boson contributions to charge asymmetry in $t\bar{t}$-production at the LHC and Tevatron

Abstract

The contributions of $G^{\prime }$-boson predicted by the chiral color symmetry of quarks to the charge asymmetry $A_C(pp\to t\bar{t})$ in $t\bar{t}$ production at the LHC and to the forward-backward asymmetry $A_{\mathrm{FB}}(p\bar{p}\to t\bar{t})$ in $t\bar{t}$ production at the Tevatron are calculated and analysed in dependence on two free parameters of the model, the $G^{\prime }$ mass $m_{G^{\prime }}$ and mixing angle ${\theta }_G$. The $m_{G^{\prime }}-{\theta }_G$ regions of $1\sigma$ consistency with the CMS data on the cross section $\sigma (pp\to t\bar{t})$ and on the charge asymmetry $A_C(pp\to t\bar{t})$ are found and compared with those resulted from the CDF data on the cross section $\sigma (p\bar{p}\to t\bar{t})$ and on the forward-backward asymmetry $A_{\mathrm{FB}}(p\bar{p}\to t\bar{t})$ of $t\bar{t}$ production at the Tevatron with account of the current SM predictions for $A_{\mathrm{FB}}(p\bar{p}\to t\bar{t})$.

Comments: 11 pages, 3 figures, accepted for publication in Modern Physics Letters A; v2: corrected misprint, added references