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 $tu\ell\ell$ and $tc \ell \ell$ with complex Wilson coefficients as an illustrative example and show that it may generate ${ \cal O}(10\%)$ CP asymmetries that should be accessible at the LHC with an integrated luminosity of ${ \cal O}(1000)$ fb$^{ -1}$.
Categories: hep-ph hep-ex