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T: Fachverband Teilchenphysik

T 29: Top Quark 2 (Zerfälle)

T 29.3: Vortrag

Dienstag, 28. März 2017, 11:30–11:45, JUR 4

Studies of top tagging in CMS — •Torben Dreyer, Johannes Haller, Roman Kogler, Alexander Schmidt, and Svenja Schumann — 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 to identify these jets. An efficient identification of top quark jets increases the sensitivity in searches for heavy new particles and opens the high momentum phase space for standard model measurements of the top quark.

This contribution includes studies of top-tagging algorithms with the CMS detector at 13 TeV. The performance of established algorithms and new approaches is studied in simulation and data. Scale factors are derived to correct for potential differences in the efficiencies and misidentification rates between data and simulation.