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In this letter we explore beyond the Standard Model top-Higgs Yukawacouplings as a function of a CP-mixing parameter $\xi_t$ at the 14 TeV HL-LHCin the process $pp\to thj$. We observe that angular variables of the decayproducts of the top are non-trivially sensitive to $\xi_t$. This fact isexploited in a full detector level analysis that employs machine learningtechniques to optimize signal sensitivity on a suite of variables, includinglepton azimuthal angle. The key result of this study is an improved projectedexclusion limit on $\xi_t$ even when including the realistic effects ofdetector smearing and a conservative estimate of systematic error.

Top polarisation as a probe of CP-mixing top-Higgs coupling in $tjh$ signals