Validation of aMC rate at NLO and Herwig++ for processes involving top quarks

Measurements of top-associated Higgs production are among the flagship analyses of the second run of the LHC with the process pp → t anti tH giving access to the Yukawa coupling of the Higgs particle to the top quark. The process pp → t anti tb anti b forms an irreducible background not only to these measurements but also to other searches investigating charged Higgs and SUSY models. From a theoretical perspective processes with such a large number of massive particles and different mass scales are quite challenging and typically suffer both from large theory uncertainties as well as modelling uncertainties regarding the treatment of masses and the splitting of the gluon into pairs of heavy quarks. In this talk the Monte Carlo event generation with aMC rate at NLO matched at next-to-leading order to the Herwig++ parton shower will be studied for processes involving top quarks that are relevant in measurements of top-associated Higgs production in the second run of the LHC. Following up on the findings from Run 1 different radiation and scale settings will be evaluated and compared to results obtained during the 2015 data taking period at a center-of-mass energy of 13 TeV.