Generic Tests of $CP$ Violation in High-$p_T$ Signals at the LHC and Beyond

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