Ponente
Descripción
We study the sensitivity of top-quark pair production at the FCC-ee to heavy new physics, parametrised
in the Standard Model effective field theory, using discriminants based on matrix elements. The
analysis includes detector reconstruction effects, obtained with a fast simulation of the IDEA detector
concept, and jet flavour tagging. We consider dimension-six operators that modify the electroweak
couplings of the top quark or generate four-fermion interactions, at leading order and
in diagrams with two resonant top quarks. The full six-body kinematic information is employed
to maximise the discrimination power against the Standard Model. Two bins per dimension in
the space of 12 discriminants, one per operator considered, provide a simple and robust methodology
to set nearly optimal multidimensional constraints. Bounds on the new physics scale can
reach values up to 30 TeV in a single-operator fit and up to 5 TeV in a global multi-operator fit. A
combination with High-Luminosity LHC prospects on top-quark operators shows complementary
sensitivities which help lift approximate degeneracies.
