Test of CP invariance in vector-boson fusion production of the Higgs boson in the $H\to \tau \tau$ channel in proton$-$proton collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

Abstract

A test of CP invariance in Higgs boson production via vector-boson fusion is performed in the $H\to \tau \tau$ decay channel. This test uses the Optimal Observable method and is carried out using 36.1 ${\mathrm{fb}}^{-1}$ of $\sqrt{s}$ = 13 TeV proton$-$proton collision data collected by the ATLAS experiment at the LHC. Contributions from CP-violating interactions between the Higgs boson and electroweak gauge bosons are described by an effective field theory, in which the parameter $\tilde{d}$ governs the strength of CP violation. No sign of CP violation is observed in the distributions of the Optimal Observable, and $\tilde{d}$ is constrained to the interval $[-0.090,0.035]$ at the 68% confidence level (CL), compared to an expected interval of $\tilde{d}\in [-0.035,0.033]$ based upon the Standard Model prediction. No constraints can be set on $\tilde{d}$ at 95% CL, while an expected 95% CL interval of $\tilde{d}\in [-0.21,0.15]$ for the Standard Model hypothesis was expected.

44 pages in total, author list starting page 28, 6 figures, 5 tables, published in Phys. Lett. B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2018-14

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