NLO QCD Predictions for off-shell $t \bar t$ and $t \bar t H$ Production   and Decay at a Linear Collider
  We present predictions for $t \bar t$ and $t \bar t H$ production and decay at future lepton colliders including non-resonant and interference contributions up to next-to-leading order (NLO) in perturbative QCD. The obtained precision predictions are necessary for a future precise determination of the top-quark Yukawa coupling, and allow for top-quark phenomenology in the continuum at an unprecedented level of accuracy. Simulations are performed with the automated NLO Monte-Carlo framework WHIZARD interfaced to the OpenLoops matrix element generator. 
Bijan Chokouf\'e Nejad, Wolfgang Kilian, Jonas M. Lindert, Stefano   Pozzorini, J\"urgen Reuter, Christian Weiss
hep-ph hep-ex