Abstract
A combination of measurements of the CP properties of Higgs boson interactions with electroweak gauge bosons is presented, using 140 fb(-1) of proton-proton collisions at root s = 13 TeV recorded by the ATLAS detector. Results from vector boson fusion H -> tau tau/WW*/gamma gamma, inclusive H -> ZZ*, and WH, H -> b (b) over bar channels are combined. No evidence of CP violation is observed, and constrains on the CP-violating operators in the Standard Model effective field theory framework (SMEFT) are set in theWarsaw basis. The results from the combination improve by over 40% on previous individual limits on c(H<(W)over tilde) and, for the first time, simultaneous constraints on three coefficients c(H<(W)over tilde>), c(H<(B)over tilde), and c(H<(W)over tildeB) are set. These limits are the most stringent constraints to date on the relevant Wilson coefficients in the SMEFT framework with minimum model dependence.