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T: Fachverband Teilchenphysik

T 2: Higgs-Boson (Zerfall in Tau-Leptonen) I

T 2.6: Vortrag

Montag, 29. Februar 2016, 12:15–12:30, VMP5 HS A

Search for H-->tautau decays in the semi-leptonic final state and measurement of the tau identification efficiency using LHC pp data at sqrt(s)=13 TeV collected with the ATLAS detector — •Théo Megy, Lei Zhang, and Karsten Köneke — Albert-Ludwigs-Universität Freiburg

The discovery of a Higgs-like particle in 2012 led to several studies aiming to measure the properties of this new particle, amongst which are the measurements of its couplings to Standard Model particles. The most accessible way to measure Higgs couplings to leptons is to study its decay into a pair of taus. A discovery of this decay channel of the Higgs boson was made in a combined analysis of the full LHC run 1 data collected by the ATLAS and CMS detectors. The large expected integrated luminosity of the LHC run 2 will enable enable an observation of the H->tautau decays using data collected by the ATLAS detector alone. Therefore, this talk will discuss the techniques that will be used for this analysis for the case where one tau decays leptonically and the other hadronically. A prerequisite for such an analysis is a precise understanding of the reconstruction and identification of hadronically decaying tau leptons. The methodology of determining the hadronic-tau identification efficiency with 13 TeV data will be descibed and the results of this measurement will be discussed.