Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 53: Suche nach Neuen Teilchen III

T 53.5: Talk

Wednesday, March 27, 2019, 17:00–17:15, H07

Search for a light CP-odd Higgs boson decaying into a pair of taus — •Paul Moder, Arno Straessner, and Wolfgang Mader — IKTP, Dresden, Germany

Even though the predictions of the SM have often agreed with experimental observations to an incredible degree, there are still some phenomena it can not explain, for example the anomalous magnetic moment of the muon, which shows significant deviations in the experiment. This deviation could be explained in the context of a 2 Higgs Doublet Model(2HDM), which predicts a second Higgs doublet with one CP-odd Higgs boson. Interesting parameters of the model are the mass of the CP-odd Higgs boson and the couplings to charged leptons and up type quarks.

In this talk, a search for a light CP-odd Higgs boson is presented through a cut based analysis. In the analysis the Higgs boson is produced via gluon fusion and then decays into a pair of two tau leptons, where both tau leptons decay leptonically, one into an electron, one into a muon. The analysed mass range of the CP-odd Higgs boson lies between 60 GeV and 90 GeV, which is a favored part of the parameter space to explain the deviation between SM prediction and experimental results of the magnetic moment of the muon. This potential new search is discussed based on Monte Carlo simulations, assuming 36.1 fb⁻¹ of data collected by the ATLAS experiment at 13 TeV. The sensitivity of the analysis is then presented in terms of discovery significance and expected exclusion limits for the coupling to up type quarks in this scenario.