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T: Fachverband Teilchenphysik

T 59: Elektroschwache Wechselwirkung I

T 59.4: Vortrag

Mittwoch, 21. März 2018, 17:20–17:35, Z6 - SR 1.005

Study of the electroweak W^±W^±jj process and its experimental challenges — •Giulia Gonella and Karsten Köneke — Albert-Ludwigs-Universität Freiburg

Measurements of the electroweak sector of the Standard Model are a way to probe the mechanism of electroweak symmetry breaking at LHC, and to detect small deviations from the theoretical predictions, through which the effect of new physics could manifest itself. In this context the scattering of vector bosons is a key process. In particular the production of W bosons pairs is a vital test of the mechanism, since its scattering amplitude would increase at high energies violating unitarity, without cancellations of divergences due to exchange involving Z or Higgs boson. The talk will give an overview of the measurements of the WW production of two W bosons with the same electric charge in the signature of two leptons, missing transverse energy and two jets with the ATLAS experiment at the LHC. The same-charge requirement leads to a better suppression of the QCD background, but is experimentally more challenging due to the contributions from opposite-charge di-lepton production processes, where the charge of one electron is wrongly reconstructed. The talk will finally focuse on the procedure and techinques applied to estimate this intrumental background using data, and will illustrate its challenges and its impact on the measurement of WW scattering.