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We demonstrate that the multi-top productions efficiently probe theCP-property of top-Higgs interaction and the Higgs-boson width at the LHC. Thefour top-quark production alone can exclude a purely CP-odd top-quark Yukawacoupling at the 13~TeV LHC with an integrated luminosity of $430~{\rmfb}^{-1}$, regardless the size of the Yukawa coupling. Combining the singleHiggs-boson production, the $t\bar{t}H$ associated production and the fourtop-quark production, we show that the CP-phase of the top-quark Yukawacoupling and the Higgs-boson width can be stringently bounded at the LHC withintegrated luminosities of $300~{\rm fb}^{-1}$ and $3000~{\rm fb}^{-1}$.

Limiting Top-Higgs Interaction and Higgs-Boson Width from Multi-Top Productions