Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 8: Higgs Boson: Decay in Fermions 1

T 8.4: Vortrag

Montag, 21. März 2022, 17:00–17:15, T-H21

Signal selection and background estimation for testing CP invariance in vector boson fusion production of the Higgs boson in the H→τ_eτ_µ decay channel using the ATLAS detector — •Ye Joon Kim, Valerie Lang, Ö. Oğul Öncel, and Markus Schumacher — Albert-Ludwigs-Universität Freiburg

The combination of charge conjugation symmetry (C) and parity symmetry (P), together denoted as CP invariance, is violated in the Standard Model (SM) of particle physics in the weak interaction. The amount of CP violation in the SM is not enough to explain the observed baryon asymmetry in the universe. Further sources of CP violation may exist in the Higgs sector. The CP nature of the Higgs boson coupling to vector bosons is investigated in vector-boson fusion production (VBF) of the Higgs boson exploiting the H→τ_eτ_µ decay channel.

In this talk, contributions to the search for CP violation in VBF production in the H→τ_eτ_µ channel based on pp collision data collected with the ATLAS detector at √s=13 TeV corresponding to an integrated luminosity of 139 fb⁻¹ are discussed.

The estimation of background processes, in particular from events where jets are falsely identified as electrons or muons, with the data-driven matrix method is presented. Studies of the signal selection will also be shown.