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T: Fachverband Teilchenphysik

T 73: Top-Quarks: Eigenschaften und Zerfälle III

T 73.4: Vortrag

Donnerstag, 22. März 2018, 17:20–17:35, Philo-HS1

Measurement of Top Tagging Efficiencies in CMS — •Torben Dreyer, Roman Kogler, and Johannes Haller — Institut für Experimentalphysik, Universität Hamburg

High Lorentz boosts pose a challenge to the reconstruction of hadronically decaying top quarks (t → bW → bqq’) as the decay products of the top quark are collimated and a reconstruction in three separate jets is no longer possible. Instead, the decay products merge and are reconstructed in one large jet. Top tagging uses the substructure of large jets for top quark identification, which opens the high momentum phase space for standard model measurements of the top quark and increases the sensitivity in searches for heavy new particles.

This contribution presents measurements of top tagging efficiencies with the CMS detector at a center of mass energy of 13 TeV. The performance of established algorithms and new approaches is studied in simulation and data, and correction factors are derived for the use of these algorithms in physics analyses.