Test of CP invariance in vector-boson fusion production of the Higgs boson using the Optimal Observable method in the ditau decay channel with the ATLAS detector

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Aad, G; Abbott, B; Abdinov, O; Abdallah, J; Abeloos, B; Aben, R; Abolins, M; Aben, R; Abolins, M; AbouZeid, OS; ...Date
2016-11-29Source Title
European Physical Journal C: Particles and FieldsPublisher
SPRINGERUniversity of Melbourne Author/s
Barberio, Luigia; Kubota, Takashi; Urquijo, Phillip; Taylor, Geoffrey; Volpi, Matteo; ZANZI, DANIELE; Nuti, Francesco; Milesi, Marco; Dawe, Edmund; Petersen, Brian; ...Affiliation
School of PhysicsMetadata
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Aad, G., Abbott, B., Abdinov, O., Abdallah, J., Abeloos, B., Aben, R., Abolins, M., Aben, R., Abolins, M., AbouZeid, O. S., Abraham, N. L., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adamczyk, L., Adams, D. L., Adelman, J. ,... Zwalinski, L. (2016). Test of CP invariance in vector-boson fusion production of the Higgs boson using the Optimal Observable method in the ditau decay channel with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 76 (12), https://doi.org/10.1140/epjc/s10052-016-4499-5.Access Status
Open AccessAbstract
A 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 [Formula: see text] leptons and is based on 20.3 [Formula: see text] of proton-proton collision data at [Formula: see text] = 8 [Formula: see text] 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 [Formula: see text]. 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 [Formula: see text] is constrained to the interval [Formula: see text] at 68% confidence level, consistent with the Standard Model expectation of [Formula: see text].
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