Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 28: Higgs-Zerfälle in Fermionen I

T 28.7: Vortrag

Dienstag, 26. März 2019, 17:35–17:50, H04

Search for lepton-flavour violating decays of the Higgs-boson using the asymmetry method with the ATLAS experiment at √s=13 TeV — •Katharina Schleicher, Kathrin Becker, and Markus Schumacher — Albert-Ludwigs-Universität Freiburg

After the discovery of the Higgs boson the search for lepton-flavour violating (LFV) couplings is an interesting topic. These are predicted in several models, including supersymmetric extensions of the standard model (SM) and in general two-higgs-dublet models. In nature, LFV was already observed in form of neutrino oscillations.

Possible LFV decays in the Higgs-sector are H→ eµ, H→τ e and H→τµ. In this analysis only the decays of H→τ e and H→τµ with leptonic τ-decays leading to eµ+X final states are considered. For background estimation the asymmetry method is utilized. It exploits two principles: First, SM backgrounds with prompt leptons are symmetric with respect to a replacement of electrons with muons and vice versa. And second, this symmetry is broken when assuming that the branching ratios of the two considered LFV decays are of different magnitude.

One challenge of the analysis is to maintain this symmetry despite the experimental differences of electrons and muons. Another challenge is to enhance the sensitivity. Therefore, a dedicated statistical model and a multivariate analysis are developed.

The analysis is performed on data recorded in proton-proton collisions with the ATLAS detector at √s=13 TeV.