Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 65: Experimental methods III

T 65.8: Talk

Wednesday, March 17, 2021, 17:45–18:00, To

Improving truth smearing for tau leptons at the ATLAS detector — •Daniel Buchin and Alexander Mann — Ludwig-Maximilians-Universität München

Searches for physics beyond the Standard Model (SM) rely on Monte-Carlo simulations of the signal process to identify an excess with respect to the SM background. This simulation consists of two steps: the physical process itself (truth level) and the detector response (reconstruction level). For some large-scale studies of models beyond the SM, e.g. a scan of the parameter space of the phenomenological Minimal Supersymmetric SM, a full simulation of the supersymmetric processes of each model point is not feasible. To skip the reconstruction-level simulation, smearing functions are used to make truth-level objects resemble reconstruction-level objects as accurately as possible.

In this study, we are looking at ways to improve the accuracy of the truth smearing of tau leptons. To achieve this, we predict the efficiency of the tau reconstruction and identification using a Boosted Decision Tree (BDT) based on truth level variables. This efficiency parametrization can then be used to smear truth level objects.