Speaker
Description
We derive partial-wave unitarity constraints on CP-odd operators in the Standard Model Effective Field Theory (SMEFT) that generate genuine anomalous quartic gauge couplings. We consider the complete set of twelve independent dimension-eight CP-odd operators, comprising six mixed field-strength structures and six tensor operators built from dual field strengths.
We analyze two-to-two scattering of electroweak gauge bosons and Higgs bosons, including all coupled channels and helicity amplitudes contributing to the $J=0$ and $J=1$ partial waves. The corresponding coupled-channel scattering matrices are constructed and diagonalized in the multidimensional space of Wilson coefficients to extract perturbative unitarity bounds. We present the complete set of constraints, systematically exploring all relevant combinations of simultaneously switched-on CP-odd operators and quantifying the impact of their interplay on the resulting bounds.