Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 59: Elektroschwache Wechselwirkung I

T 59.7: Talk

Wednesday, March 21, 2018, 18:05–18:20, Z6 - SR 1.005

Measurement of the scattering of electroweak gauge bosons in the like-charge WWjj final state with the ATLAS detector at the LHC — •Stefanie Todt, Franziska Iltzsche, Joany Manjarres, Carsten Bittrich, Tim Herrmann, and Michael Kobel — IKTP, TU Dresden

Since the discovery of a SM-like Higgs boson, the scattering of massive weak vector bosons (VBS) has been a further yet missing piece in the Standard Model puzzle. Due to the best signal to background ratio, the W^±W^±jj channel is the most favourable final state for studying VBS at a hadron collider such as the LHC. VBS in this channel contains processes with triple and quartic electro-weak (EWK) couplings, as well as Higgs exchange processes. The Higgs contribution is crucial as it ensures unitarity of the scattering amplitude of VBS. Therefore it represents an optimal physics process to probe the non-abelian structure of the EWK Standard Model and at the same time serves as complementary approach to study the EWK symmetry breaking mechanism. We present the analysis of W^±W^±jj VBS conducted at the ATLAS experiment with data taken at √s = 13 TeV in Run-2 of the LHC. Major goals include the observation of the scattering process. A further aim is the measurement of the fiducial cross section of the EWK process which involves the development of a decent understanding of the theoretical predictions. A further critical analysis component constitutes the estimate of major backgrounds. These include instrumental mis-measurements which are insufficiently described by simulations and therefore need the employment of data-driven approaches.