2026/01/23 by Yuchuan Feng, Chris Culver, Michael Döring +3
#hep-lat #hep-ph #nucl-th
The quest to understand three-body dynamics from first-principle QCD includes the study of non-resonant and resonant systems. The isospin I=2 system is of particular interest having no three-body resonance but featuring a resonance in a sub-channel, while also being a coupled-channel problem. In this study, we calculate the finite-volume spectrum from lattice QC at two different pion masses, map the amplitude to the infinite volume through a generalized FVU three-body quantization condition, investigate the limit of a narrow ρ, and compare with an effective Lagrangian prediction at leading order. Chiral extrapolations between different pion masses are performed.