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T: Fachverband Teilchenphysik

T 28: Top quarks: mass and jets

T 28.6: Vortrag

Dienstag, 31. März 2020, 18:15–18:30, H-HS XI

Using CWoLa on all-jets final state at √s = 13 TeV for top quark mass measurements — Christoph Garbers, Johannes Lange, Peter Schleper, •David Spataro, and Hartmut Stadie — Institut für Experimentalphysik, Universität Hamburg

Top quarks are copiously produced in pairs in the CMS experiment at the LHC. The most likely decay channel results in all-jet final states. The selection of these final states is a challenge due to the huge amount of QCD multi-jet events and Inaccuracies of the simulation in modeling this background.

The CWoLa method (Classification Without Labels) bypasses this difficulty by using only not labeled data events to train a Neural Network. The received binary classifier separates tt from QCD and is compared to a classifier, which was trained on MC simulated labeled tt and QCD events. The application of the CWoLa classifier on data is discussed.