Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 73: Higgs-Boson 6 (Zerfälle in Tau-Leptonen)

T 73.4: Talk

Wednesday, March 29, 2017, 17:30–17:45, JUR 3

Modelling of Z→ττ processes with τ-embedded Z→µµ data in ATLAS — Elias Coniavitis, •Alena Lösle, Dirk Sammel, Markus Schumacher, and Duc Bao Ta — Physikalisches Institut, Universität Freiburg

The decay channel H→ττ is of great interest as it allows to investigate the coupling of the Higgs boson to fermions. In this channel the dominant and irreducible background contribution is given by Z→ττ events. The embedding method allows to model Z→ττ processes in a data-driven way by selecting Z→µµ events in data and replacing the muons by τ-leptons from simulated Z→ττ decays. The embedded Z→ττ sample then contains similar conditions as the analysed data set, such as underlying event and pile-up acitivity, while also the kinematics of additionally produced jets does not rely on simulation.
In order to correctly embed simulated τ-leptons in Z→µµ data events, all detector signatures arising from the original muons have to be identified and removed from the event in a first step. Here, one important task is the subtraction of the energy deposits by the muons in the electromagnetic and hadronic calorimeters. While this estimate currently relies on the simulation of Z→µµ events, a new method to access the information by using a parametrization of the energy deposits in data has been developed.
In this talk I will give an overview of the status of embedding in ATLAS for LHC Run 2 and present a new method to subtract the energy deposits by muons in the calorimeters.