Göttingen 2025 – scientific programme

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T: Fachverband Teilchenphysik

T 68: Higgs Physics VIII (CP)

T 68.5: Talk

Thursday, April 3, 2025, 17:15–17:30, ZHG105

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 discovery of the Higgs boson, one of the most important tasks in particle physics is to measure all of its properties as precisely as possible. The Higgs boson does not only play a crucial role in understanding electroweak symmetry breaking but might also be connected to, and thus hint towards, physics beyond the Standard Model. One desirable feature of a more complete model of particle physics is additional CP violation in order to allow for electroweak baryogenesis.

A possibility to introduce additional CP violation is that the physical Higgs boson is not a CP-eigenstate but an admixture. In this work it is investigated whether the sensitivity of CP-tests in the decay H → τ⁺ τ⁻ at the LHC can be improved by using the method of optimal observables. An outline of the construction of said observables, as well as studies of their sensitivity using simulated signal events only, will be presented.

Keywords: Particle Phenomenology; CP Violation; Higgs Physics