Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 5: Electroweak Interactions (Exp.) 1

T 5.5: Vortrag

Montag, 21. März 2022, 17:20–17:35, T-H18

A data-driven multijet background estimation method for the measurement of the electroweak Wjj production with the ATLAS experiment — •Lisa Marie Baltes — Kirchhoff-Institute for Physics, University Heidelberg, Germany

The observation and measurement of self-interactions of weak gauge bosons provide an indirect search for physics beyond the Standard Model. The electroweak production of a W boson in association with two jets includes the triple gauge boson vertices WWγ and WWZ and is thus sensitive to the vector-boson-fusion (VBF) production of a W boson. In proton-proton collisions, the characteristic signature of a VBF includes two high-momentum jets at small angles with respect to the incoming beams and a centrally produced lepton-neutrino pair originating from the W boson decay. A significant background for this analysis is the multijet production via the strong interaction where a jet is misidentified as a lepton. It is difficult to model this background since it strongly depends on detector-related quantities such as lepton identification and isolation criteria. Therefore, data-driven techniques are used to estimate this background. In this talk, the results of the multijet background estimation using the matrix method are presented.