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Bonn 2020 – scientific programme

The DPG Spring Meeting in Bonn had to be cancelled! Read more ...

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T: Fachverband Teilchenphysik

T 88: Top quarks: associated production

T 88.7: Talk

Thursday, April 2, 2020, 18:00–18:15, L-4.001

Constraining top-quark couplings combining top-quark and B decay observablesStefan Bißmann, Johannes Erdmann, •Cornelius Grunwald, Gudrun Hiller, and Kevin Kröninger — TU Dortmund, Fakultät Physik, Deutschland

Over the last years the Standard Model Effective Field Theory (SMEFT) gained a lot of popularity in model-independent searches for physics beyond the Standard Model in the top-quark sector. Various efforts are being made to interpret measurements of top-quark production and decay observables in the context of SMEFT, aiming towards a global fit of dimension-six operators affecting the top quark. In this talk, a new approach is presented, combining measurements from top-quark and B physics observables to constrain the Wilson coefficients of dimension-six operators that modify the couplings of the top quark to the gauge bosons. Considering the ttγ cross section together with the BXs γ branching fraction, the ingredients required for a consistent combination of observables from different energy scales are discussed and the benefits of this approach for the resulting constraints on the Wilson coefficients are demonstrated.

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