Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 62: Standard model 2 (electroweak/bosons)

T 62.3: Talk

Wednesday, March 6, 2024, 16:30–16:45, Geb. 30.23: 2/0

Measurement of γγ jj final states from Vector Boson Scattering at the ATLAS experiment — •Orcun Kolay and Frank Siegert — Technische Universität Dresden, Germany

Vector boson scattering (VBS) offers an opportunity to study triple and quartic gauge couplings, which are relatively uncommon occurrences. This provides us with a means to examine the Standard Model (SM), the electroweak (EW) symmetry-breaking mechanism, and to explore potential new physics phenomena.

This study focuses on the final state involving two photons and two jets, denoted as γγ jj. The γγ jj process has a crucial role not only for new physics anomalies such as the coupling of four neutral gauge bosons but also for understanding the background of the two-photon final state of the Higgs boson produced via vector boson fusion.

The measurement of the VBS γγ jj process comes along with two main challenges: The background coming from QCD induced γγ jj and misidentified jets as photons. This presentation covers an ongoing work focusing on the phase space strategy discriminating EW γγ jj processes from the background, the estimation of backgrounds from misidentified jets, and the treatment of the systematics.

Keywords: Standard Model; photon; jet; vector boson scattering; electroweak