Speaker
Description
Multi-hadron spectroscopy is complicated by discretization and excited-state effects that must be disentangled to reliably resolve finite-volume energy differences entering quantization conditions. I will present precise constraints on baryon-baryon scattering from block Lanczos analyses of large interpolator sets, for which two-sided bounds provide constraints on the locations of LQCD energies whose validity does not require excited-state effects to be small. Results from 11 gauge-field ensembles spanning a factor of two in lattice spacing and factor of twenty-seven in physical volume with fixed (albeit unphysical) mpi/MN = 0.5 enable detailed studies of discretization effects, finite-volume effects, and quark-mass-mistuning effects. Discretization effects can be clearly resolved, even within the relatively loose constraints provided by two-sided gap/variational bounds, and significant preferences are found for one class of models of discretization effects under the same mild assumptions on spectral gaps.