Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 58: Top-Quarks: Eigenschaften II

T 58.2: Talk

Wednesday, March 21, 2018, 16:45–17:00, Z6 - SR 1.002

Constraining dimension-six effective operators through the combination of top quark measurements using EFTfitter — •Cornelius Grunwald, Johannes Erdmann, and Kevin Kröninger — TU Dortmund, Experimentelle Physik IV

In the search for physics beyond the Standard Model, effective field theories allow for model-independent probes of large energy scales by introducing higher dimensional operators. The coupling strengths of these effective operators are expressed by the so-called Wilson coefficients.

In this talk, a multidimensional fit constraining the Wilson coefficients of five dimension-six operators is presented. The model describing the observables in terms of Wilson coefficients is determined from Monte Carlo computations. Measurements of top quark cross sections and W boson helicity fractions, performed by the ATLAS collaboration, are combined using the EFTfitter tool. It is demonstrated that correlations between the uncertainties of measurements need to be taken into account in the fit, since they might significantly impact the resulting constraints.