# Dortmund 2021 – wissenschaftliches Programm

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# T: Fachverband Teilchenphysik

## T 87: Extended Higgs Models III

### T 87.4: Vortrag

### Donnerstag, 18. März 2021, 16:45–17:00, Tl

Search for a light CP-odd Higgs boson decaying into a pair of taus with ATLAS — •Xynia-Magdalena Sonntag, Tom Kreße, Wolfgang Mader, and Arno Straessner — IKTP, Dresden, Germany

Even though theoretical predictions of the SM are corresponding to experimental results to an incredible degree, there are still some phenomena unexplained, for example the deviation of the measured anomalous magnetic moment of the muon from SM calculations. This deviation could be explained by the flavor-aligned two-Higgs-doublet model (2HDM). The introduction of a second Higgs doublet leads to four additional Higgs bosons, one of which being CP-odd and electrically neutral. Parameters of interest in this model are the mass of the CP-odd Higgs boson and the couplings to charged leptons and up type quarks.

In this talk, the search for such a light CP-odd Higgs boson produced via gluon fusion and decaying into a pair of tau leptons is presented, looking at final states with one electron and one muon. The mass range of the CP-odd Higgs boson analyzed lies between 40 GeV and 90 GeV. The search is based on Monte Carlo simulations and data to Monte Carlo comparisons in background control regions using 139 fb^{−1} of data collected by the ATLAS experiment at 13 TeV. Results will be presented, focussing on a refined event selection optimized according to the expected limit for the production of such a CP-odd Higgs boson.