INT S@INT Seminar: "From two to three-body systems in lattice QCD"  

Abstract:
Much of the resonant spectrum of QCD consists of states which decay strongly into two- and
three-body states. Lattice QCD calculations have matured to the stage where these states
can be reliably resolved in first principles numerical calculations. While connecting these
finite-volume results to infinite-volume scattering processes is now commonplace in the
two-body sector, three-body physics presents more difficulties. Building upon results in the
two-body sector, I will describe a recent calculation involving three pions in maximal isospin,
and compare to predictions from a state-of-the-art phenomenological formalism. We find agreement
between predictions and lattice results, indicating the reliability of the approach