Quantum observables at colliders ( and the Quest for Toponium)

by Regina Demina (University of Rochester)

Tuesday 24 Mar 2026, 15:30 → 16:30 US/Eastern

Large Seminar Room

Abstract: While quantum mechanics underpins particle physics, truly quantum effects are surprisingly difficult to establish in high-energy interactions. A rare exception comes from recent observations of quantum entanglement in top–antitop quark pairs by the ATLAS and CMS experiments. In certain regions of phase space, these particles appear to lie outside the causality cone, makingthe result even more intriguing. In this talk, I will review the details ofthese ground breaking measurements, their implications, and potential criticisms. I will also discuss the possibility of extending this strategy to the system of tau leptons at BelleII experiment. Additionally, I will explore an exciting possibility: the discovery of toponium, a bound state of top and antitop quarks. If confirmed, this would be the heaviest known particle, with a mass of 343 GeV—surpassing even the heaviest nucleus, Oganesson, at 279 GeV.

 

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