Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 53: Electroweak Interactions I
T 53.5: Talk
Wednesday, March 17, 2021, 17:00–17:15, Tc
Data-driven estimation of the non-prompt background in same charged W±W± boson scattering within the ATLAS experiment — •Max Stange, Michael Kobel, Joany Manjarres, and Carsten Bittrich — IKTP, TU Dresden, Germany
The scattering of electroweak vector bosons offers a unique opportunity to study the electroweak sector of the Standard Model of particle physics, the Higgs mechanism, and furthermore physics beyond the Standard Model. One of the cleanest channel to investigate vector boson scattering at the LHC is the scattering of same charged W± bosons. In the previous publications largest experimental uncertainty of the measurement, was coming from the data-driven estimation of misidentified leptons (non-prompt leptons).
This study aims to improve the data-driven method used so far to estimate this non-prompt background. The method is adapted to use a new dilepton control region and thoroughly tested with Monte Carlo simulated events. This dilepton control region is kinematically closer to the signal region than the dijet control region used in the previous publications. The data studied in this thesis were measured with the ATLAS experiment at a collision energy of 13 TeV with an integrated luminosity of 138.7 fb−1.
To validate the data-driven method using data the low dijet invariant mass validation region is used, which is kinematically very close to the signal region. The data in this validation region is sufficiently well modeled by the data-driven method, making this method a valuable alternative to the one currently in use by the W±W±jj-EW analysis.