Multi-hadron spectroscopy in a large physical volume
Abstract
We demonstrate the efficacy of the stochastic LapH method to treat all-to-all quark propagation on a Nf = 2+1 CLS ensemble with large linear spatial extent L = 5.5 fm, allowing us to obtain the benchmark elastic isovector p-wave pion-pion scattering amplitude to good precision already on a relatively small number of gauge configurations. These results hold promise for multi-hadron spectroscopy at close-to-physical pion mass with exponential finite-volume effects under control.
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