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T: Fachverband Teilchenphysik

T 32: Higgs Physics IV

T 32.8: Vortrag

Dienstag, 17. März 2026, 18:00–18:15, KH 01.019

Test of CP invariance of the Higgs-strahlungs process pp→ V→ VH exploiting the H→ττ and V→ jj decay mode with the ATLAS detector — •Frederik Schulz, Lorenzo Rossini, and Markus Schumacher — Albert-Ludwigs-Universität, Freiburg, Deutschland

One open question in cosmology is the origin of the observed baryon asymmetry in our universe. This asymmetry can be explained if the three Sakharov conditions are fulfilled. One of these conditions includes the violation of the invariance under combined charge (C) and parity (P) conjugation. However, the magnitude of CP effects predicted in the Standard Model (SM) is not large enough to explain the size of the observations. The Higgs boson is a promising candidate for investigating possible CP-violating interactions, particularly in the coupling vertex with vector bosons (HVV).

In this talk, the focus will be on the Higgs-strahlung production mode (VH), with a subsequent decay of the Higgs boson into two hadronically decaying tau-leptons, and the V boson also decaying hadronically. Preliminary studies for an analysis based on the proton-proton data collected by the ATLAS experiments at a center of mass energy of √s=13.6 TeV during Run 3 will be presented. The analysis is based on the measurement of the CP-odd optimal observable. A profile-likelihood fit is performed to extract the expected sensitivity to CP-sensitive EFT models, such as SMEFT.

Keywords: CP Violation; VH; Higgs-strahlung