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The Higgs boson $H$ has the largest coupling to the top quark $t$ among thestandard model (SM) fermions. This is one of the ideal places to investigatenew physics beyond SM. In this work, we study the potential of determiningHiggs boson $CP$ properties at the LHC and future 33 TeV and 100 TeV $pp$colliders by analysing various operators formed from final states variables in$t\bar{t}H$ production. The discrimination power from SM coupling is obtainedwith Higgs boson reconstructed from $ H\to \gamma \gamma$ and $ H\to b\bar{b}$. We find that $t\bar{t}b\bar{b}$ process can provide more than3$\sigma$ discrimination power with 300 $fb^{-1}$ integrated luminosity in awide range of allowed Higgs to top couplings for the LHC, the 33 TeV and 100TeV colliders. For $t\bar{t}\gamma\gamma$ the discrimination power will bebelow 3$\sigma$ at the LHC, while for 33 TeV and 100 TeV colliders, more than3$\sigma$ sensitivity can be reached.

Probing Higgs Boson $CP$ Properties with $t\bar{t}H$ at the LHC and the 100 TeV $pp$ Collider