Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 53: Electroweak Interactions I

T 53.7: Talk

Wednesday, March 17, 2021, 17:30–17:45, Tc

Search for anomalous couplings in the hadronic decay channel of Vector Boson Scattering at the CMS experiment — Steffen Albrecht¹, Thomas Müller², and •Max Neukum² — ¹Institut für Experimentalphysik, Universität Hamburg — ²Institut für Experimentelle Teilchenphysik (ETP), Karlsruher Institut für Technologie (KIT)

Vector boson scattering (VBS) is at the LHC the dominating processes to investigate the quartic vertex of electroweak theory and the cross section is ultimately determined by the Higgs boson. New physics in the Higgs sector may thus alter the cross section noticeably even if it is currently out of reach of direct measurements.

Deviations of couplings at high energies are formulated in an effective field theory, a bottom-up approach, which parametrizes a multitude of explicit theories. Limits on introduced parameters allow to draw conclusions regarding the strength and energy scale of new physics.

This presentation describes the search for anomalous couplings in the hadronic decay channel of VBS at a center-of-mass energy of 13 TeV. Jet substructure techniques are used to distinguish between signal and background events and a three-dimensional fit supresses contributions from QCD events.