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T: Fachverband Teilchenphysik
T 41: Electroweak physics II
T 41.1: Vortrag
Dienstag, 31. März 2020, 17:00–17:15, L-3.016
Polarization studies in the scattering of two vector bosons with the ATLAS experiment at the LHC — •Jan-Eric Nitschke, Carsten Bittrich, Joany Manjarres, and Michael Kobel — TU Dresden, Germany
In the SM, W and Z bosons acquire their masses through the Higgs mechanism where the Goldstone bosons from the electroweak symmetry breaking (EWSB) are absorbed into the W and Z bosons and become their longitudinal components. This makes the scattering of longitudinal-longitudinal vector boson interactions (VL VL) the ideal process to examine the EWSB mechanism and to search for new physics. Without a Higgs boson or an equivalent mechanism the predicted cross section for the scattering of longitudinally polarized bosons violates unitarity at high energies.
A precise measurement of the cross section of this process could eventually help us to understand if the observed Higgs boson behaves like a Standard Model one or might give us hints at new physics beyond the Standard Model.
In order to do such a study at the LHC it is necessary to extract the polarization of the vector bosons from the decay products measured with the ATLAS detector. For this, two methods of generating simulations of polarized bosons in the WZjj finale state are studied.
Determining the fractions of each polarization in the final state requires observables sensitive to these polarizations. Observables sensitive to the polarization of the W- and Z-Boson as well as the combination of both are obtained via template fits.*