Séminaires du DPhP: Toponium at the LHC: a new frontier in top-quark physics

par Baptiste Ravina, Prof. Benjamin Fuks (LPTHE Paris / Sorbonne Université)

lundi 1 déc. 2025, 11:00 → 12:30 Europe/Paris

CEA Paris-Saclay

The top quark, the heaviest known elementary particle, has long been thought unable to form bound states. However, intriguing hints in recent LHC data suggest that toponium, a short-lived quasi-bound state of a top-antitop pair, might have left observable traces in data and possibly even been discovered. In this seminar, we will discuss why toponium is a unique laboratory for studying the theory of the strong interaction in the non-relativistic regime and how modern theoretical techniques allow bound-state effects to be incorporated into state-of-the-art collider simulations. We will then review experimental signatures that could reveal the presence of toponium in current and future LHC data and finally, highlight recent ATLAS measurements showing an excess of events near threshold consistent with toponium formation, compare them with CMS results and theoretical expectations, and outline prospects for further investigation. Together, this will offer a comprehensive overview of the current status and future directions for using toponium as a new window into the physics of the top quark.

zoom connection: https://cern.zoom.us/j/68399739111?pwd=SGErcHBQYmVLWFZTVE9jdm5xSmdEdz09

 

Toponium at the LHC-1.pdf