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Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 38: Standard model 1 (electroweak/bosons)

T 38.5: Talk

Tuesday, March 5, 2024, 17:00–17:15, Geb. 30.23: 2/0

Search for scattering of same-sign WW boson pairs in the semi-leptonic channel at the CMS experiment.Thorsten Chwalek1, Nils Faltermann1, Abideh Jafari2, Thomas Müller1, and •Komal Tauqeer11Institut für Experimentelle Teilchenphysik (ETP), Karlsruher Institut für Technologie (KIT), Germany — 2Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany

Vector Boson Scattering (VBS) at the LHC is a key process to probe the electroweak symmetry breaking of the standard model (SM). Deviations in VBS cross section measurements point to physics phenomena beyond the SM. Same-sign WW scattering is known as the golden channel to study VBS as it has the best σEWQCD ratio. Studying this process in semi-leptonic channel will broaden the search as it provides a much larger branching ratio. The biggest challenge here is to identify the correct bosons (W+, W, Z) in the final state that are decaying into quarks.

To distinguish jets in the final state that are coming from the hadronic decay of the bosons, we have developed a method to identify the charge of the jet using state-of-art machine learning techniques. With the help of this method, we are able to distinguish between jets originating from W+, W, or Z bosons. In this talk, I will present the techniques used for doing the jet charge tagging and how we are implementing these techniques to study the same-sign WW VBS process in the semi-leptonic channel.

Keywords: Electroweak; W bosons; VBS; CMS

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