Conveners
Hadronic Interactions II
- Amy Nicholson (University of North Carolina at Chapel Hill)
Description
co-host: Dave Gaskell
The discovery of many unexpected new resonance candidates such as the XYZ states and pentaquarks has been challenging the quark model. While high-energy collisions of hadrons and nuclei are a good tool for investigating these topics, they are prone to kinematical effects from hadron decays into the final states. In turn, lepton colliders have been limited by statistics so far: a...
In this talk, I present a lattice-QCD calculation of the maximal-isospin, three-pion scattering amplitude (3π+ to 3π+). The calculation combines finite-volume energies with a relativistic field-theoretic formalism, required to interpret the results. I will describe the full work-flow required to reach the final amplitude, implemented here for the first time, and discuss the complicated...
Lattice QCD offers a systematic pathway to numerically compute the resonant hadronic spectrum from first principles. A set of integral equations connects the short-distance dynamics computed from lattice QCD to on-shell infinite-volume scattering amplitudes. In this talk, I will discuss our recent study on systematically improvable methods for the numerical solution of integral equations of a...
Much of the resonant spectrum of QCD consists of states which decay strongly into two- and three-body final 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 is now commonplace in the two-body sector, three-body physics...
A rich variety of phenomena in the Standard Model and its extensions manifest in long-range processes involving hadrons. These are processes where intermediate hadronic states propagate over a long distance, between electroweak interactions (or new-physics), e.g. deeply virtual Compton scattering. Such processes are at the cusp of what can be systematically studied thanks to significant...
