# Aachen 2019 – wissenschaftliches Programm

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# T: Fachverband Teilchenphysik

## T 76: Higgs-Zerfälle in Bosonen

### T 76.7: Vortrag

### Donnerstag, 28. März 2019, 17:30–17:45, H04

**Investigation of the CP properties of the Higgs boson in fully hadronic final states of VBF ***H*→ττ** events with the ATLAS detector** — •Serhat Ördek, Michel Janus, and Stan Lai — Georg-August-Universität Göttingen

Recent studies at the LHC have confirmed that the Higgs boson couples to τ leptons with a strength compatible with the Standard Model. Based on this, the next step is to measure the properties of its couplings, including whether the Higgs couplings violate CP conservation.

The analysis presented in this talk focuses on events where Higgs bosons are produced via vector boson fusion in order to investigate the tensor structure of their coupling to electroweak gauge bosons. For this, a profile likelihood fit using a matrix-element observable method is employed in the decay channel *H*→τ_{had}τ_{had} to test whether a CP-odd component is present in the coupling. A measurement of a non-zero value would be an indication of CP-violation in the Higgs sector.