Seminar · Particle Physics
Old Tools for New Puzzles: From Toponium Physics to the Exotic Nature of X(3872)
Davide Germani · Sapienza University of Rome
Thu, Oct 1, 2026 · 14:00 UTC
Davide Germani discusses how established field-theory techniques help interpret precise ATLAS and CMS measurements of heavy-quark systems. The first case concerns top–antitop states near their production threshold, drawing on recent calculations by Paolo Nason and collaborators. Topics include threshold resummation, nonperturbative QCD corrections, and the way the top quark’s short lifetime controls the formation and decay of quasi-bound states at collider energies. The second case examines whether X(3872) is a compact exotic hadron or a weakly bound neutral D-meson molecule. A comparison of t