@article{2df782693f6e479f9b9dc96f5036da72,
title = "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",
abstract = "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\textasciitilde{}. 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\textasciitilde{} is constrained to the interval (- 0.11 , 0.05) at 68\% confidence level, consistent with the Standard Model expectation of d\textasciitilde{} = 0.",
author = "\{The ATLAS Collaboration\} and G. Aad and B. Abbott and O. Abdinov and J. Abdallah and B. Abeloos and R. Aben and M. Abolins and R. Aben and M. Abolins and AbouZeid, \{O. S.\} and Abraham, \{N. L.\} and H. Abramowicz and H. Abreu and R. Abreu and Y. Abulaiti and Acharya, \{B. S.\} and L. Adamczyk and Adams, \{D. L.\} and J. Adelman and S. Adomeit and T. Adye and Affolder, \{A. A.\} and T. Agatonovic-Jovin and J. Agricola and Aguilar-Saavedra, \{J. A.\} and Ahlen, \{S. P.\} and F. Ahmadov and G. Aielli and H. Akerstedt and {\AA}kesson, \{T. P.A.\} and Akimov, \{A. V.\} and Alberghi, \{G. L.\} and J. Albert and S. Albrand and Verzini, \{M. J.Alconada\} and M. Aleksa and Aleksandrov, \{I. N.\} and C. Alexa and G. Alexander and T. Alexopoulos and M. Alhroob and G. Alimonti and J. Alison and Alkire, \{S. P.\} and E. Cheu and Johns, \{K. A.\} and P. Loch and Rutherfoord, \{J. P.\} and Shupe, \{M. A.\} and Varnes, \{E. W.\}",
note = "Publisher Copyright: {\textcopyright} 2016, CERN for the benefit of the ATLAS collaboration.",
year = "2016",
month = dec,
day = "1",
doi = "10.1140/epjc/s10052-016-4499-5",
language = "English (US)",
volume = "76",
journal = "European Physical Journal C",
issn = "1434-6044",
publisher = "Springer Nature",
number = "12",
}