Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 30: Top Physics II (Properties)
T 30.4: Vortrag
Dienstag, 1. April 2025, 17:00–17:15, VG 1.103
Using improved bb4ℓ predictions for the simultaneous extraction of the top-quark mass and decay width — Diptaparna Biswas1, Beatrice Cervato1, Markus Cristinziani1, Carmen Diez Pardos1, Ivor Fleck1, Arpan Ghosal1, Gabriel Gomes1, Jan Joachim Hahn1, Vadim Kostyukhin1, Nils Krengel1, Buddhadeb Mondal1, Stefanie Müller1, Sebastian Rentschler1, Elisabeth Schopf1, •Katharina Voss1, Wolfgang Walkowiak1, Adam Warnerbring1, and Tongbin Zhao1,2 — 1Experimentelle Teilchenphysik, Center for Particle Physics Siegen, Universität Siegen — 2Shandong University, China
The sensitivity of the simultaneous measurement of the top-quark mass and decay width using the full Run-2 √s=13 TeV ATLAS dataset depends critically on the accurate modeling of the WWbb final state in Monte Carlo simulations. In particular, a precise description of the tt/tW interference and of the off-shell effects of the top-quark is essential. These effects are modelled at next-to-leading-order accuracy by the bb4ℓ POWHEG generator. We present the nominal bb4ℓ signal sample used in ATLAS, which is generated with a new, improved bb4ℓ process version, as well as a prescription to evaluate modelling uncertainties associated with this sample.
Finally, the influence of the updated bb4ℓ signal sample on the top-quark mass and width analysis, which targets the WWbb final state in dileptonic eµ decay, is discussed.
Keywords: Top quark mass; Top quark decay width; bb4l generator; Modelling uncertainties; Top Modelling