Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 32: Higgs Physics IV
T 32.7: Talk
Tuesday, March 17, 2026, 17:45–18:00, KH 01.019
Construction and investigation of optimal observables for testing CP invariance in the decay H →τ+ τ− at the LHC — •Yann Stoll, Heidi Rzehak, and Markus Schumacher — Albert-Ludwigs-Universität, Freiburg
Since the Higgs boson’s discovery, a central objective in particle physics has been the precise determination of its properties. Beyond its key role in electroweak symmetry breaking, the Higgs sector may also provide clues to physics beyond the Standard Model.
In particular, extended models that aim to support electroweak baryogenesis require additional sources of CP violation, which could arise if the Higgs boson is not a CP eigenstate but a CP-mixed state. In the Higgs-tau-tau vertex the strength of CP violation can be parameterized by a single parameter φCP. This talk examines whether the CP-sensitivity in the decay h→τ+τ− at the LHC can be enhanced through the use of optimal observables. The tau-lepton decay modes τ±→ (π±ν), (π±π0 ν) and (l±νν) are considered. We will outline the construction of these observables and present a sensitivity study based on simulated signal samples. This study is based on the past analysis by the ATLAS collaboration using the Run-2 data set collected at a centre-of-mass energy of 13 TeV, in the sense that we use a comparable event selection and categorization.
Keywords: Particle Phenomenology; CP Violation; Higgs Physics