CP tests for high-$p_T$ multi-leptons

Abstract

We propose a generic and model-independent search strategy for probing tree-level CP-violation in inclusive multi-lepton signals and we extend the standard expression for tree-level CP-violation in scattering processes at the LHC to include the cases where the initial state in not self-conjugate. 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 $\mathcal{O}(10\%)$ CP asymmetries that should be accessible at the LHC with an integrated luminosity of $\mathcal{O}(1000)$ fb${}^{-1}$

Comments: Talk given at the 57th Recontres de Moriond 2023, EW session (flavour physics)