Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 73: Top-Quarks: Eigenschaften und Zerfälle III

T 73.3: Vortrag

Donnerstag, 22. März 2018, 17:05–17:20, Philo-HS1

Measurement of the jet mass distribution in boosted top quark decays — Johannes Haller, Roman Kogler, and •Dennis Schwarz — Institut für Experimentalphysik, Universität Hamburg

At the LHC, top quarks with high momenta play an important role in both precision measurements and searches for new physics. In these cases, the top quark decay products merge into a single hadronic jet and jet substructure techniques become important to resolve and identify the top quark. The presented analysis aims at a measurement of the jet mass distribution of highly boosted top quarks at √s=13 TeV, which is not only a crucial jet substructure variable but also shows sensitivity to the top quark mass. The measured distribution is unfolded to particle level to be comparable to analytical calculations that are now available for the LHC. The differential tt production cross section and the top quark mass can be extracted. In studies of several jet clustering algorithms the XCone algorithm was found to give the best performance.