Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 5: Electroweak Interactions (Exp.) 1
T 5.1: Gruppenbericht
Montag, 21. März 2022, 16:15–16:35, T-H18
Measuring mass and width of the W-boson with the ATLAS detector — Philip Bechtle1, Klaus Desch1, Philip Kennedy2, Oleh Kivernyik1, Jakub Kremer2, •Philipp König1, and Matthias Schott2 — 1Rheinische-Friedrich-Wilhelms-Universität Bonn — 2Johannes 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 the most precise single measurement with 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).
A detailed comparison of the analysis design between the reanalysis and the 2017 analysis is carried out. Improvements are made in the estimation of the multijet background and the description of some systematic uncertainties. The new fitting method of a profile likelihood fit is studied carefully and cross-checked against the results of the revised analysis.