SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 6: Other Exp., EW

T 6.5: Talk

Monday, March 20, 2023, 17:30–17:45, HSZ/0103

Machine Learning Application for Single Boson Polarization Measurement in Same-Charged WW Scattering Within the Atlas Experiment — •Max Vincent Stange for the ATLAS collaboration — Institut für Kern- und Teilchenphysik, Technische Universität Dresden

In 2019, the scattering of same-charged W bosons was measured for the first time in the ATLAS experiment. This process provides a strong dependence on the exact mechanism of electroweak symmetry breaking. Since the W bosons obtain their mass and thus their longitudinal polarization directly from the Higgs mechanism, the longitudinal parts of the W boson scattering are particularly promising for studying the Higgs mechanism and finding physics beyond the Standard Model. Since the scattered W bosons decay into one charged lepton and one neutrino each, the original polarizations of the W bosons can no longer be reconstructed directly from the measurement. To be able to measure the contribution of WW scattering with at least one longitudinal boson, multi-variable analysis techniques are applied in the analysis. In this regard, this talk will demonstrate the application of neural networks trained to distinguish signal from background and polarizations. The focus is on comparing different methods to maximize the expected significance.