Modelling top-quark decays in tttt production at the LHC
Abstract
We compare the fixed-order NLO QCD predictions for the pp tttt+X process in the 4 decay channel with the parton-shower based results obtained with the POWHEG and MC@NLO matching methods. In the first case, NLO QCD corrections are consistently included in both the tttt production step and the decays of the four top quarks, preserving all spin correlations. In the second approach, higher-order effects in top-quark decays with approximate spin correlations are simulated in the PYTHIA parton-shower framework. Additionally, we analyse the impact of including the so-called matrix element corrections in top-quark decays in both parton-shower matched predictions. The comparison is performed at the integrated and differential fiducial cross-section level for the LHC centre-of-mass energy of s=13.6 TeV.
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