Landscaping CP-violating BSM scenarios

Abstract

We consider a wide range of UV scenarios with the aim of informing searches for CP violation at the TeV scale using effective field theory techniques. We demonstrate that broad theoretical assumptions about the nature of UV dynamics responsible for CP violation map out a small subset of relevant operators at the TeV scale. Concretely, this will allow us to reduce the number of free parameters that need to be considered in experimental investigations, thus enhancing analyses' sensitivities. In parallel, reflecting the UV dynamics' Wilson coefficient hierarchy will enable a streamlined theoretical interpretation of such analyses in the future. We demonstrate a minimal approach to analysing CP violation in this context using a Monte Carlo study of a combination of weak boson fusion Higgs and electroweak diboson production, which provide complementary information on the relevant EFT operators.

EFT Diagrammatica II: Tracing the UV origin of bosonic D6 CPV and D8 SMEFT operators

“…It has been established in recent works [61,62] that while a single heavy fermion in the loop can lead to the CP conserving counterparts of the operators listed in Eq. (3.3), the CP-violating ones necessitate the inclusion of a second heavy fermion.…”