Speaker
Description
The finite-volume Lüscher formalism and its extensions provide a powerful method for extracting scattering amplitudes and resonance properties in lattice QCD calculations. The finite-volume energies used in the approach must satisfy an upper bound, i.e. they must be below the lowest multi-particle threshold not explicitly considered in the derivation. Ignoring this would lead to incorrect scattering amplitudes, missing the branch cuts associated with the open channels. Recently, it has become increasingly important to note that the finite-volume energies must also satisfy a lower bound, i.e. they must be above the nearest left-hand branch cut resulting from the crossing symmetry of the amplitudes. In this talk I will summarise progress in extending the framework to treat left-hand cuts with implications for lattice scattering calculations of NN, DD*, and other relevant channels.
