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 ; Abraham, NL ; Abramowicz, H ; Abreu, H ; Abreu, R ; Abulaiti, Y ; Acharya, BS ; Adamczyk, L ; Adams, DL ; Adelman, J ; Adomeit, S ; Adye, T ; Affolder, AA ; Agatonovic-Jovin, T ; Agricola, J ; Aguilar-Saavedra, JA ; Ahlen, SP ; Ahmadov, F ; Aielli, G ; Akerstedt, H ; Åkesson, TPA ... view all 85 authors (2016)
  • Publisher: eScholarship, University of California
  • Subject:
    arxiv: High Energy Physics::Phenomenology | High Energy Physics::Experiment

© 2016, CERN for the benefit of the ATLAS collaboration.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 τ leptons and is based on 20.3 fb - 1 of proton–proton collision data at 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~. 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~ is constrained to the interval (- 0.11 , 0.05) at 68% confidence level, consistent with the Standard Model expectation of d~ = 0.
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