From QED atoms to QCD hadrons
Hadrons are strongly bound, yet their spectra can be classified as for atoms (and molecules). The apparent dominance of the valence (qq-bar, qqq) components of QCD bound states is paradoxical: The strong binding would be expected to generate an abundance of quark and gluon constituents. I recall the standard bound state methods of QED, and propose an equivalent, more intuitive approach. In QCD it allows to introduce the hadron scale through the fixing of temporal (A0 = 0) gauge, giving a confining potential which depends on a single parameter Λ. The features of the qq-bar bound states formed by this potential are promising even in the αs → 0 limit.
Wednesday, 11th October 2023, 14:30 — Sala Wataghin