SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 7: Higgs, Di-Higgs I
T 7.5: Vortrag
Montag, 20. März 2023, 17:30–17:45, HSZ/0105
Test of CP invariance in Higgs boson production via vector boson fusion exploiting the H→τhadτhad decay mode — •Daniel Bahner, Ö. Oğul Öncel, and Markus Schumacher — Albert-Ludwigs-Universität, Freiburg, Deutschland
In the universe, an asymmetry exists between the number of baryons and the anti-baryons. Three Sakharov conditions need to be fulfilled in order to explain this observed baryon asymmetry. One of those is the violation of the CP invariance. Its amount in the Standard Model is not enough to explain the asymmetry. The discovery of the Higgs boson has opened a new window to search for additional sources of CP violation. The vector-boson fusion (VBF) production of the Higgs boson is one of them. In the VBF production topology, it is possible to probe CP-violating contributions to the HVV coupling vertex.
In this talk the fully hadronic decay channel, where VBF-produced Higgs boson decays into two hadronically decaying tau leptons, is presented. The dominant background process in this decay channel is the irreducible Z→ττ process. A data-driven Fake Factor method is used to estimate the sizeable contribution from events in which jets are misidentified as hadronically decaying tau leptons. A neural network is exploited to discriminate signal from background processes.
CP-odd observables are used in a profile-likelihood fit to perform a test of CP invariance and to constrain the strength of new CP-violating interactions. The talk will discuss the analysis strategy, CP-odd observables, and first results based on √s=13 TeV proton-proton collision data collected by the ATLAS detector with Lint=139 fb−1.