Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 52: Top quark decay and top properties II

T 52.1: Talk

Wednesday, March 17, 2021, 16:00–16:15, Tb

Measurement of observables sensitive to color reconnection effects in t t dilepton events — Dominic Hirschbuehl, Wolfgang Wagner, and •Shayma Wahdan — Bergische Universität Wuppertal

The color reconnection (CR) modelling uncertainty could become one of the dominant sources of systematic uncertainties in the top mass determination. Ongoing top-quark mass analyses use the PYTHIA 8 MC generator for parton showering and hadronization. PYTHIA 8 comes with several alternative CR models which should be explored to estimate the CR modelling uncertainty. At the same time, the models should be confronted with collision data to test their validity. Only models which are in agreement with data in general are suitable to define the corresponding modelling uncertainty. This analysis presents a measurement of three of the most discriminating observables between these models in t t dilepton events. The sensitive observables use tracks associated to the vertex of the hard scattering (primary vertex). The selected tracks are diluted with pile-up tracks and tracks of secondary particles. Therefore, a procedure is developed for correcting the pile-up contribution. After the correction the observables are unfolded to the particle-level and the unfolded spectrum is compared to the different CR models.