SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 80: Searches EW II

T 80.5: Vortrag

Mittwoch, 22. März 2023, 18:30–18:45, HSZ/0101

A precision measurement of fiducial and differential cross sections of WW production with the ATLAS detector — •José Antonio Fernández Pretel, Beate Heinemann, and Oleg Kuprash for the ATLAS collaboration — Albert-Ludwigs Universität Freiburg

Measuring production of W boson pairs at particle colliders gives an important way to test the predictions of Standard Model (SM) of particle physics in both perturbative Quantum Chromodynamics and Electroweak domains. Production of WW is also a significant background source for Higgs measurements (especially H→ WW) and beyond SM searches. In this measurement, fiducial and differential cross sections are obtained using the full Run 2 dataset collected in proton-proton collisions at the LHC at center-of-mass energy of √s=13 TeV with the ATLAS detector, corresponding to an integrated luminosity of 139 fb⁻¹. Multiple background contributions such as fake and non-prompt leptons are estimated using data-driven techniques. In contrast to most previous measurements that enhance the WW signal purity by vetoing hadronic jets in the final state, the first measurement of WW cross sections using a fully jet-inclusive selection is presented in this work, providing the most precise cross sections of WW production achieved in hadron-hadron collisions to date. The measurements are also performed in a dynamic jet-veto phase space. Additionally, detector level distributions are used to extract constraints on dimension-6 Wilson coefficients in the Standard Model Effective Field Theory. No deviations with respect to the SM are observed.