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T: Fachverband Teilchenphysik

T 1: Invited Overview Talks I

T 1.1: Invited Overview Talk

Monday, March 16, 2026, 14:45–15:15, AudiMax

Top-quark physics in a new regime: precision, effective field theory, and the top-quark pair production threshold — •Knut Zoch — CERN, Geneva, Switzerland

The top quark, the heaviest known elementary particle, plays a central role in testing the Standard Model and probing physics at the highest energy scales. Building on the legacy of the Run 2 data set and motivated by the growing Run 3 program, the LHC experiments continue to deliver a broad range of results that advance our understanding of top-quark production and interactions.

This talk will review recent experimental highlights from the ATLAS and CMS collaborations, including measurements of top-quark production in association with the Higgs boson, effective field theory interpretations of top-quark observables, improved determinations of the top-quark mass, and first results exploiting Run 3 data. Particular emphasis will be placed on measurements of top-quark pair production near threshold, where bound-state-like effects (``toponium'') become accessible and open a new window on strong-interaction dynamics in the top-quark sector.

Together, these results illustrate how precision measurements and novel kinematic regimes in top-quark physics continue to sharpen our picture of the Standard Model and constrain possible extensions.

Keywords: Top-quark physics; Precision measurements; Effective field theory; Threshold phenomena