Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 87: Electroweak Interactions (Exp.) 2

T 87.6: Vortrag

Donnerstag, 24. März 2022, 17:35–17:50, T-H18

Search for γ γ →WW (jjlν) coupling in pp collisions at √s = 13 TeV with the ATLAS detector — •Varsiha Sothilingam — Kirchhoff-Institut für Physik, Heidelberg

Due to the non-abelian nature of the electroweak sector of the Standard Model of Particle Physics (SM), direct interactions between gauge couplings is possible. Measurements of its cross section allow for validation of the SM and potential deviations opens possibilities for physics beyond the SM. This talk is focused on the coupling between W bosons and photons where the W bosons decay semileptonically. They interact via the triple (γ W⁺W⁻) and quartic (γ γ W⁺W⁻ ) gauge couplings of the SM. This process can be produced via centrally exclusive production at the LHC, which provides the signal while keeping the protons 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. Using the central detector to measure the WW decay and protons measured using AFP, the four momenta of the final state is known. This talk gives a deeper overview of this rare process and the methods used to define a mass signal region of interest to perform the searches for this process. Additionally it will provide an overview of the pile up and background challenges which have to be managed in this analysis.