Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 83: Top-Physik III

T 83.3: Talk

Thursday, March 28, 2019, 16:30–16:45, S10

Constraining the color reconnection uncertainty in the top-quark mass measurement — Dominic Hirschbühl, •Shayma Wahdan, and Wolfgang Wagner — Bergische Universität Wuppertal

The color reconnection (CR) modelling uncertainty could become one of the dominant sources of systematic uncertainty in the top mass determination. Ongoing top mass analyses in Run 2 of the LHC use the PYTHIA 8 generator for parton showering and hadronization. This new generator comes with several alternative CR models which should be explored to estimate the CR modelling uncertainty, providing a broader basis for the estimate compared to the PYTHIA 6 generator which was used in Run 1 analyses. An investigation to find the most discriminating observable between these models is presented in tt dilepton events. The observable is unfolded to the particle level.