Cross Section and Forward-Backward Asymmetry of $t\bar{t}$ Production in the Model with Four Color Symmetry

Abstract

The contributions to the cross section σ t t and to the forward-backward asymmetry A t t FB of t t production at the Tevatron from Z ′ -boson and scalar leptoquarks S (±) a and scalar gluons F a predicted by the minimal model with four color quark-lepton symmetry are calculated. These contributions are shown to be small in tree approximation and can be significant with account of the 1-loop gt t effective vertex induced by the scalar doublets. The lower mass limit for scalar gluons m F 320 GeV from the Tevatron data is obtained and it is shown that for m F1 990 GeV the scalar gluon F 1 can be evident at LHC at the significance not less that 3σ (for √ s = 14 TeV, L = 10 f b −1 ).