SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 133: Top, EW II
T 133.1: Vortrag
Donnerstag, 23. März 2023, 17:30–17:45, HSZ/0103
Measuring mass and width of the W-boson with the ATLAS detector — Philip Bechtle1, Klaus Desch1, Oleh Kyvernyik1, Jakub Kremer2, •Philipp König1, and Matthias Schott2 — 1Rheinische-Friedrich-Wilhelms-Universität Bonn — 22Johannes Gutenberg-Universität Mainz
In 2017, the ATLAS collaboration measured the W-boson mass using pp-collision data taken at √s=7 TeV in 2011, resulting in a precision of 19 MeV. We present a revised analysis of the same dataset, improving the fit methods and including a measurement of the width of the W-boson. A precise measurement of these quantities in the decay of the W-boson represent an excellent precision test of the Standard Model (SM). The recently released measurement of the W-boson mass using the full dataset recorded by the CDF collaboration is in significant tension with all previous measurements.
We will present the revised analysis of the ATLAS data including extensive cross-checks of the new profile likelihood fit approach. Detailed stability and consistency checks of the measurements will be discussed. Finally, a novel approach to validate fit models will be presented.