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The determination of the CP nature of the top quark Yukawa coupling isaddressed in this phenomenological work, using $t\bar{t}h$ events at the$\sqrt{s}$ = 13 TeV LHC, with $h\rightarrow b\bar b$ and through the dileptondecay channel of $t\bar{t}$. Signal events were generated for pure $CP$-even,pure $CP$-odd and mixed-$CP$ coupling scenarios. Standard Model (SM)backgrounds were also considered. Angular distributions and asymmetries werestudied and found to be potentially good probes to the $CP$ nature of thecoupling, even after detector simulation and full event reconstruction using akinematic fit. Expected limits to the $t\bar th$ production cross-section timesbranching ratio were obtained for a range of top quark Yukawa $CP$-mixingangles and for different integrated luminosities of the LHC.

Probing the CP nature of the Higgs coupling in $t\bar{t}h$ events at the LHC