Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 59: Extended Higgs models II
T 59.4: Vortrag
Mittwoch, 17. März 2021, 16:45–17:00, Ti
Constraints on Higgs CP-properties in the Higgs Characterization model from HiggsSignals — •Marco Menen, Tobias Klingl, Tim Stefaniak, Henning Bahl, Philip Bechtle, and Klaus Desch — Rheinische Friedrich-Wilhelms-Universität Bonn
Following the discovery of a Standard Model (SM) like Higgs boson in 2012, many of it’s properties are by now determined with high precision from measurements by the ATLAS and CMS experiments. This includes that it is not a pure CP-odd state. However, a possible CP-mixing of the Higgs Boson or a complex CP-structure of it’s couplings to individual particles are still allowed.
Many theories of physics beyond the SM (BSM) allow or motivate the introduction of CP violation in the Higgs sector. This can be described within concrete models, such as Supersymmetry or the 2-Higgs-Doublet model, or in different frameworks of effective models. In this talk, the Higgs Characterization (HC) model is presented. It introduces either a global mixing angle α between the two CP states and/or individual CP-even and CP-odd couplings of the Higgs Boson to SM particles, partly due to BSM higher-dimensional operators.
The programs HiggsBounds and HiggsSignals are used to calculate couplings, rates and limits on additional states, and compare them to available data from the 7, 8 and 13 TeV runs of the LHC at CERN via a statistical χ2 test. To find constraints on the new parameters of the HC model, a Markov Chain Monte Carlo approach is used and its performance is evaluated against other techniques. The fit results for different realizations of the HC model are presented.