Electroweak Sudakov corrections and the top quark forward-backward asymmetry

The Standard Model (SM) top quark forward backward asymmetry is shown to be slightly enhanced by a correction factor of 1.05 due to electroweak Sudakov (EWS) logs of the form (α/sin2θW)nlogm⩽2n(s/MW,Z2). The EWS effect on the dijet and tt¯ invariant mass spectra reduces the SM prediction by ∼20,10% respectively for the highest invariant masses measured at the LHC, and changes the shape of the high-mass tail. These corrections affect measurements of the top quark invariant mass spectrum and the search for excess events related to AFBtt¯.