“Future Collider Perspectives on Higgs CP Violation” investigates how upcoming collider facilities can advance the search for new sources of Charge Conjugation and Parity (CP) violation. This is a crucial ingredient for explaining the observed matter–antimatter asymmetry in the universe, and our best theory so far, the Standard Model, does not provide enough CP violation to explain the matter-dominated universe we see. Within the framework of effective field theory, we focus on CP-violating interactions between the Higgs and electroweak gauge bosons. Using detailed Monte Carlo simulations, fast detector modelling, and both traditional and machine-learning-optimised CP-sensitive observables, we evaluate the expected sensitivity of the High Luminosity-LHC, and future electron-positron and hadron-hadron concepts. We find that future colliders, in particular the so-called FCC-hh, can improve constraints on these CP-violating operators by up to an order of magnitude relative to the LHC. Our analysis also highlights the complementary strengths of hadron and lepton colliders and demonstrates how precision measurements will shape the future exploration of electroweak symmetry breaking. (Read more)