Coupled-channel approach to isotensor πππ scattering from lattice QCD
Abstract
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 , and compare with an effective Lagrangian prediction at leading order. Chiral extrapolations between different pion masses are performed.
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