Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 38: Standard model 1 (electroweak/bosons)

T 38.4: Talk

Tuesday, March 5, 2024, 16:45–17:00, Geb. 30.23: 2/0

Polarization Measurement in Same-Charged WW Scattering Within the ATLAS Experiment — •Max Stange, Frank Siegert, Erik Bachmann, Mareen Hoppe, and Tim Herrmann — TU Dresden, Dresden, Germany

In 2023, the ATLAS experiment marked the first differential cross-section measurement of same-charged W boson scattering, a process crucial for understanding 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. As these bosons decay into a charged lepton and a neutrino, directly reconstructing their original polarizations is impossible. To address this, the analysis uses neural networks to separate the background and the polarizations within the same charged W boson signal. The talk gives an overview of the applied machine learning techniques and the study of next-to-leading-order corrections applied for the polarization.

Keywords: ATLAS; Polarization; Neural Networks; W Boson