Karlsruhe 2024 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 100: Higgs 4 (coupling to taus, CP, rare decays)
T 100.5: Vortrag
Donnerstag, 7. März 2024, 17:00–17:15, Geb. 30.41: HS 2
Comparison of the sensitivity of different CP-odd observables for testing CP-invariance in the Vector-Boson-Fusion production of the Higgs-Boson — •Lea Kuttler, Lorenzo Rossini, and Markus Schumacher — Albert-Ludwigs-Universität Freiburg
The observed baryon asymmetry in our universe (BAU) can be explained if the three Sakharov conditions, including the violation of CP-invariance, are met. However, the amount of CP-violation predicted by the Standard Model, via the CKM-matrix, is insufficient to explain the BAU. Hence, it is instructive to search for new sources of CP-violation in the Higgs sector. The vector-boson fusion production allows to investigate the CP-structure of the Higgs-boson coupling to electroweak gauge bosons HVV and to test its CP invariance.
The strength of the new CP-violating interactions can be constrained by maximum-likelihood fits to the distribution of CP-odd-observables. In this talk, the sensitivity of different CP-odd observables exploiting the H → τhadτhad decay mode are compared by determining the expected length of the confidence intervals for the CP-violating coupling strength. The comparison includes both, newly constructed machine learning observables and traditional ones, such as the azimuthal angle difference of the tagging jets and the optimal observable.
The sensitivities are derived from simulated events corresponding to the data set collected with the ATLAS detector during Run-2 of the LHC at a center of mass energy of 13 TeV.