Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 77: Suche nach Supersymmetrie 4

T 77.4: Talk

Wednesday, March 29, 2017, 17:30–17:45, JUR 498

Jet Smearing as a tool for the accurate description of QCD backgrounds in SUSY searches with tau leptons — Philip Bechtle, •Florian Beisiegel, Klaus Desch, Oliver Ricken, and Steffen Schaepe — University of Bonn

The estimation of all relevant backgrounds is very important for all kinds of analyses. Multijet background via QCD processes is notoriously hard to describe by simulation in kinematical regions with large missing transverse momentum because of the enourmous requirement on Monte-Carlo statistics. This situation also arises in SUSY searches. Therefore, data-driven techniques need to be employed. Jet Smearing is such a data-driven technique for QCD estimation. It uses multijet events with very good transverse energy balance selected from data, which then are smeared using response functions of the average jet mismeasurement controlled from data.
In my talk, I will briefly introduce the principles of the Jet Smearing technique. Afterwards I will present the results of Jet Smearing in SUSY searches in strongly produced events with hadronically decaying tau leptons, jets and missing transverse momentum at √s = 13 TeV for the 3.16 fb⁻¹ of ATLAS data collected in 2015. Also the current status of Jet Smearing for the full 13 TeV ATLAS 2015 and 2016 data will be shown.
Furthermore an approach for the estimation of the uncertainties depending on the seed statistics will be presented.
Finally an outlook on future tasks and possible improvements will be given.