Çetin, Serkant Ali2020-11-052020-11-052016-11-291434-60521434-6044https://hdl.handle.net/11411/2458https://doi.org/10.1140/epjc/s10052-016-4499-5A test of CP invariance in Higgs boson production via vector-boson fusion using the method of the Optimal Observable is presented. The analysis exploits the decay mode of the Higgs boson into a pair of t leptons and is based on 20.3 fb(-1) of proton-proton collision data at root s = 8 TeV collected by the ATLAS experiment at the LHC. Contributions from CP-violating interactions between the Higgs boson and electroweak gauge bosons are described in an effective field theory framework, in which the strength of CP violation is governed by a single parameter (d) over tilde. The mean values and distributions of CP-odd observables agree with the expectation in the Standard Model and show no sign of CP violation. The CP-mixing parameter (d) over tilde is constrained to the interval (-0.11, 0.05) at 68% confidence level, consistent with the Standard Model expectation of (d) over tilde = 0.eninfo:eu-repo/semantics/openAccessTRIPLE GAUGE COUPLINGSTAU-POLARIZATIONW-BOSONHADRON COLLIDERSW+W-PRODUCTIONCROSS-SECTIONASYMMETRYVIOLATIONPROGRAMNLOArticle2-s2.0-8500241262910.1140/epjc/s10052-016-4499-528316497Q1WOS:000399841100001