Special features of heavy quark-antiquark pair production ratios at LHC

Abstract

We consider the ratio of the cross section of production of heavy bottom-antibottom pairs (${\sigma }_{b\bar{b}}$) to the cross section of production of top-antitop pairs (${\sigma }_{t\bar{t}}$) at LHC. We show that in this ratio a major fraction of virtual contributions (including QCD components) disappears, leaving a residual dominant electroweak Yukawa effect that might be strongly enhanced in the presence of supersymmetry. A quantitative numerical analysis of the size of the effect is also performed under the assumption of a relatively light supersymmetric scenario.

7 pages and 2 figures