Speaker
Description
The presence of the long-range forces brings novel aspects in the formulation of the finite-volume two-body quantization condition, which relates the lattice spectrum with the infinite-volume scattering phase shifts. In particular, the higher partial waves start to contribute substantially to the quantization condition that makes the analysis more complicated. Furthermore, the so-called $t$-channel cut in the scattering amplitude moves very close to the unitarity cut, rendering the use of the standard formalism impossible just below the physical threshold. In my talk, I will review different solutions to the problem that are available in the literature. In particular, I shall concentrate on the recent proposal, based on the finite-volume version of the modified effective-range expansion.
