Studies of Monte Carlo predictions for the $t\bar{t}b\bar{b}$ process

Studies of Monte Carlo generator predictions are presented for top quark pair production in association with bottom quarks ($ttbb$). The calculations are performed at next-to-leading order in QCD for the $ttbb$ matrix-element using the four-flavour scheme. The parameters of the POWHEG+Pythia8 samples are optimised and the results are compared to predictions from POWHEG+HERWIG7 and Sherpa The studies include comparisons to simulations at parton level with stable top quarks, to simulations at particle level and to unfolded data with the aim to implement the improved theoretical knowledge, yield better agreement with data and define systematic uncertainties for the modelling of the $ttbb$ process.