Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 5: Electroweak Interactions (Exp.) 1
T 5.2: Vortrag
Montag, 21. März 2022, 16:35–16:50, T-H18
Measurement of the mass and width of the W-boson at the ATLAS experiment — •Philip David Kennedy1, Jakub Kremer1, Philipp König2, and Matthias Schott1 — 1Institute of Physics, Johannes Gutenberg Universität, D-55099 Mainz, Germany — 2Institute of Physics, Rheinische Friedrich-Wilhelms-Universität Bonn, D-53115 Bonn, Germany
We discuss the status of the W-boson mass and width measurements using data from the ATLAS experiment at the LHC. This work utilises a profile-likelihood fit to re-analyse the Run-1 dataset. This method provides an advantage over a χ2 approach used in the original analysis as the likelihood is minimised over the whole parameter space, including all systematic uncertainties. It is then used to perform the first fit of ΓW at the LHC. These results are of crucial importance for the EW-fit which bounds possible new physics scenarios. Comparison is then made between these results and those from other experiments. Particular emphasis will be placed on the performance of the profile-likelihood fit and its impact on the uncertainties of parton density functions.