Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 30: Top Physics II (Properties)

T 30.1: Vortrag

Dienstag, 1. April 2025, 16:15–16:30, VG 1.103

Towards Top Quark Mass Measurements in the Fully Hadronic tt Decay Channel using the Full Run 2 Dataset — •Tom Davids, Johannes Lange, Peter Schleper, and Hartmut Stadie — Institute of Experimental Physics, University Hamburg, Germany

Precision measurements of the mass of the top quark are an important test of Standard Model predictions. In this talk, the current progress towards a top quark mass measurement in the fully hadronic top quark pair (tt) decay channel is presented. The fully hadronic decay channel of tt-pairs has the largest branching ratio of the three dominant decay channels and has no undetectable neutrino in its final state. However, it has a large multijet background. The aim of this analysis is to evaluate data taken by the CMS detector at the LHC during Run 2 at √s=13   TeV from 2016 to 2018. This dataset corresponds to an integrated luminosity of 115.13   fb⁻¹ considering only data recorded with the selected triggers for this final state. This talk presents studies of these triggers and discusses the background prediction for the multijet background by making use of Columnflow, a highly parallelized Python-based analysis framework.

Keywords: All-jets; CMS; LHC; Run 2; Columnflow