Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 58: Top-Quarks: Eigenschaften II

T 58.8: Talk

Wednesday, March 21, 2018, 18:20–18:35, Z6 - SR 1.002

Constraints on EFT operators through a measurement of top pair spin density matrix in the dileptonic channel by the CMS experiment — •Afiq Anuar, Kelly Beernaert, Alexander Grohsjean, Gerrit Van Onsem, and Christian Schwanenberger — Deutsches Elektronen Synchrotron (DESY), Notkestraße 85, D-22607 Hamburg

The negative results obtained by searches for heavy new resonances are excluding ever more of the potential phase space where they could be directly produced at the LHC, hinting that they might be out of reach given our current facilities. This in turn makes the Effective Field Theory (EFT) description increasingly attractive as a way to explore the physics beyond the Standard Model (SM). In this approach the focus is on precision measurements and constraints are set on the EFT operators in terms of deviations with respect to SM predictions. In this talk, the basics of the EFT approach and operators will be discussed, with an emphasis on those affecting the top pair production process and how are they constrained through a measurement of the top pair spin density matrix in the dileptonic channel by the CMS experiment.