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We report on our re-calculation of electroweak top-quark pair production inStandard Model extensions with extra heavy neutral and charged spin-1 particlesat the LHC with substantial improvements. In particular, we allow forflavour--non-diagonal $Z'$ couplings and take into account non-resonantproduction in the Standard Model and beyond. As in our previous work we includeNLO QCD corrections and match to parton showers with the POWHEG method fullytaking into account the Standard Model and new physics interference effects. Weconsider the Sequential Standard Model, the Topcolour model as well as theThird Family Hypercharge Model featuring non-flavour diagonal $Z'$ couplingswhich has been proposed to explain the anomalies in $B$ decays. Numericalresults for $t\bar{t}$ cross sections at hadron colliders with $\sqrt{s}$ of upto 100 TeV are presented. We also investigate the numerical impact of the newnon-resonant contributions.

Precise predictions for electroweak $t\bar t$ production at the LHC in models with flavour non-diagonal $Z'$ boson couplings and $W'$ bosons