Test of CP-invariance of the Higgs boson in vector-boson fusion production and in its decay into four leptons Aad, G. Rodríguez Chala, Mikael Atlas Collaboration, / Hadron-Hadron Scattering Higgs Physics A search for CP violation in the decay kinematics and vector-boson fusion production of the Higgs boson is performed in the H ! ZZ ! 4` (` = e, μ) decay channel. The results are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 13TeV and recorded by the ATLAS detector from 2015 to 2018, corresponding to an integrated luminosity of 139 fb−1. Matrix element-based optimal observables are used to constrain CP-odd couplings beyond the Standard Model in the framework of Standard Model effective field theory expressed in the Warsaw and Higgs bases. Differential fiducial cross-section measurements of the optimal observables are also performed, and a new fiducial cross-section measurement for vector-boson-fusion production is provided. All measurements are in agreement with the Standard Model prediction of a CP-even Higgs boson. 2024-10-09T11:46:32Z 2024-10-09T11:46:32Z 2024-05-09 journal article Aad, G. & Rodríguez Chala, M. & ATLAS collaboration. J. High Energ. Phys. 2024, 105 (2024). [https://doi.org/10.1007/JHEP05(2024)105] https://hdl.handle.net/10481/95759 10.1007/JHEP05(2024)105 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional SpringerLink