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T: Fachverband Teilchenphysik

T 82: Higgs, Di-Higgs II

T 82.5: Vortrag

Mittwoch, 22. März 2023, 18:30–18:45, HSZ/0105

Optimisation and systematic uncertainties in the search for a light CP-odd Higgs boson with ATLAS — •Hannah Jacobi, Tom Kreße, Manuel Gutsche, Christian Schmidt, and Arno Straessner — IKTP, Dresden, Germany

The Standard Model of particle physics is a very successful theory as its predictions are in most cases compatible with experimental results. One example for deviations between the Standard Model and experimental measurements is the value of the anomalous magnetic moment g-2 of the muon. To resolve this problem expansions to the Standard Model, like the 2HDM, are proposed. This theory predicts two Higgs doublets and therefore a total of five Higgs bosons, including the CP-odd and neutral A boson. Assuming the A boson has a light mass and couples strongly to leptons and top quarks it is possible to predict a value for the g-2 that is compatible with the measured one.

This talk focuses on the experimental search for such a light CP-odd Higgs boson with a mass between 20 GeV and 110 GeV produced via gluon fusion. It is examined by looking at final states that contain one electron and one muon, which originated from the decay of the A boson to two τ leptons. The analysis uses 139 fb⁻¹ of data recorded by the ATLAS detector at a centre of mass energy of 13 TeV. Before being able to unblind the data in the signal region it is important to ensure the correct modelling of the relevant background processes, like Z bosons decaying into two τ leptons. This talk presents the investigation and correction of mismodelling between measured data and Monte Carlo predictions in dedicated validation regions.