Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 38: Standard model 1 (electroweak/bosons)

T 38.6: Talk

Tuesday, March 5, 2024, 17:15–17:30, Geb. 30.23: 2/0

Study of polarization fractions in same-sign W boson scattering with the ATLAS detector — •Prasham Jain¹, Beate Heinemann^2,3, and Oleg Kuprash¹ — ¹University of Freiburg, Freiburg im Breisgau, Germany — ²DESY, Hamburg, Germany — ³University of Hamburg, Hamburg, Germany

Polarized same-sign W boson pair production is a crucial process to examine the electroweak symmetry breaking mechanism. A measurement of the fraction of longitudinally polarized W bosons, W_L^±W_L^±, tests the unitarization mechanism of the vector boson scattering amplitude through Higgs boson contributions, and is sensitive to potential new physics effects. This talk presents machine learning (ML) methods for classification of W^±W^± polarization modes studied with the ATLAS detector using Run 2 LHC data. Results are shown of applying the ML for the extraction of longitudinal polarization fraction.

Keywords: Weak boson; Polarization; Symmetry breaking; Machine learning; Neural Network