Generic tests of CP-violation in high-$p_{\text{T}}$ multi-lepton signals at the LHC and beyond

We introduce a modification to the standard expression for tree-level CP-violation in scattering processes at the LHC, which is important when the initial state in not self-conjugate. Based on that, we propose a generic and model-independent search strategy for probing tree-level CP-violation in inclusive multi-lepton signals. We then use TeV-scale 4-fermion operators of the form $tu\mathrm{\ell }\mathrm{\ell }$ and $tc\mathrm{\ell }\mathrm{\ell }$ with complex Wilson coefficients as an illustrative example and show that it may generate $\mathcal{O}(10\mathrm{\%})$ CP asymmetries that should be accessible at the LHC with an integrated luminosity of $\mathcal{O}(1000)$ fb${}^{-1}$.