Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 11: Higgs: bosonic decays and quantum numbers
T 11.6: Talk
Monday, March 30, 2020, 17:45–18:00, H-HS XII
Test of CP invariance in vector-boson fusion production of the Higgs boson using H→ττ decays at √s=13 TeV with the ATLAS detector — Kathrin Becker1,2, •David Hohn1, Alena Lösle1, Dirk Sammel1, and Markus Schumacher1 — 1Albert-Ludwigs-Universität Freiburg — 2University of Warwick
Violation of CP invariance is one of the Sakharov conditions to explain the observed baryon asymmetry in our universe. While CP violation is already realised in the Standard Model via the CKM matrix, it is not sufficient to explain the amount of observed baryon asymmetry. Hence, it is interesting to search for new sources of CP violation in the Higgs sector. The vector-boson fusion production allows to investigate the CP structure of the Higgs-boson coupling to electroweak gauge bosons HVV and to test its CP invariance.
The analysis discussed in this talk is performed in the H→ττ decay channel and uses the CP-odd Optimal Observable to search for additional CP-odd contributions to the SM HVV coupling structure. The result is based on data taken by the ATLAS detector in 2015 and 2016 at √s=13 TeV corresponding to an integrated luminosity of 36.1 fb−1. This talk focuses on the τlepτlep and τlepτhad analysis categories and the combined result.