Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 62: Standard model 2 (electroweak/bosons)

T 62.2: Talk

Wednesday, March 6, 2024, 16:15–16:30, Geb. 30.23: 2/0

Wγγ analysis in Run 3 with the ATLAS detector at the LHC — •Isabel Sainz Saenz-Diez — Kirchhoff Institute for Physics, Heidelberg University

The production of a W boson in association with two photons from proton-proton collisions, among other triboson final states, is predicted by the Standard Model of Particle Physics (SM). The observation of this process was possible with the data collected by the ATLAS detector during the Run 2 of the LHC. This opened the possibility for testing the SM predictions, in particular the quartic gauge couplings. The focus of this talk is the analysis of Wγγ final states in Run 3. Due to the higher centre of mass energy and the large dataset, more events are expected with respect to the previous observation and dedicated triggers are now used. A study of the efficiencies of these triggers is presented, followed by the background estimation of some processes that can be misreconstructed as signal. The most relevant backgrounds come from misidentified photons, for which a data-driven estimation method is used. Additionally, results of the estimation through Monte Carlo simulations of other backgrounds are shown.

Keywords: Electroweak Interactions; W Boson; Triboson; ATLAS; Run 3