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T: Fachverband Teilchenphysik

T 37: Theorie: QCD / Top-Physik / Elektroschwache Physik

T 37.1: Talk

Tuesday, March 20, 2018, 16:30–16:45, Z6 - SR 1.013

NLO and off-shell effects in top quark mass determinations — Gudrun Heinrich¹, Andreas Maier², Richard Nisius¹, Johannes Schlenk³, Markus Schulze⁴, •Ludovic Scyboz¹, and Jan Winter⁵ — ¹Max-Planck-Institut für Physik, München, Germany — ²Experimental Physics Department, CERN, Geneva, Switzerland — ³IPPP, University of Durham, Durham, UK — ⁴Humboldt-Universität zu Berlin, Institut für Physik, Berlin, Germany — ⁵Department of Physics and Astronomy, Michigan State University, East Lansing, USA

While systematic experimental uncertainties are better understood in top measurements at LHC, it is not clear how the non-doubly resonant and non-factorizable contributions to the final state pp → W⁺W⁻ b b → (e⁺ ν_e) (µ⁻ ν_µ)b b influence the determination of the top mass. Several narrow-width approximations with different descriptions of the top decay are compared to the full NLO prediction for W⁺W⁻ b b production, namely the direct top decay at LO and NLO accuracy as well as via a parton shower. To take the equivalent of an experimental analysis as a benchmark, the different theoretical descriptions are used to calibrate template fit functions and estimate the offset in the top mass determination from pseudo-data.