Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 38: Standard model 1 (electroweak/bosons)

T 38.7: Talk

Tuesday, March 5, 2024, 17:30–17:45, Geb. 30.23: 2/0

Search for photon-induced semileptonic WW production at the ATLAS Experiment — •Varsiha Sothilingam — Kirchhoff-Institut für Physik, Universität Heidelberg

This talk will focus on the coupling between W bosons and photons where the W bosons decay semileptonically. They interact via the triple (γ → WW) and quartic (γ γ → WW) gauge boson couplings of the SM. This process can be produced via Centrally Exclusive Production at the LHC, where non-colliding protons produce a non-linear electromagnetic field which creates a photon pair. The photons couple to the W bosons, providing the signal of interest while the protons remain intact. These protons can be detected using the ATLAS Forward Proton (AFP) spectrometers, which are located around 200m away from the ATLAS detector, on both sides. Kinematic information from both the AFP and ATLAS central detector can be used to constrain the signal process. Additionally, the final state of this process favours boosted topologies which can also be exploited in the signal optimisation. With the use of the AFP detectors, such a process can be used to search for model independent extensions of the SM. This is done in the Effective Field Theory (EFT) formalisation, which the quartic coupling process is sensitive to. The anomalous quartic coupling is sensitivity to dimension-8 operators of the EFT model. This talk will provide insight to the measurement of this rare process and the methods used to optimise this search. The EFT operators which the process is sensitive to will be studied and expected experimental limits will be set.

Keywords: ATLAS; Electroweak; Forward Physics; W Bosons