Speaker
Description
Multi-hadron spectroscopy from lattice QCD commonly relies on Lüscher-type finite-volume methods to extract infinite-volume scattering amplitudes from discrete energy levels. While highly successful for short-range interactions, standard analyses based on this strategy can become problematic when light-particle exchange generates nearby left-hand cuts.
In this talk, I will review recent approaches to this problem, including finite-volume EFT and plane-wave method, modified Lüscher formalism, modified effective-range expansion, relativistic three-body field-theory formalisms and finite-volume N/D methods. Applications to $T_{cc}$, $D D^\ast$, $D D\pi$, dibaryon systems, and the $H$-dibaryon will be discussed, together with recent progress toward understanding the relations among these frameworks.