A distillation-based GEVP analysis resolves nucleon, nucleon-pion, and, for the first time, nucleon-pion-pion states in lattice QCD, with a physical-point nucleon mass of 0.927(21)(05) GeV.
Investigation of two-particle contributions to nucleon matrix elements
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abstract
We investigate contributions of excited states to nucleon matrix elements by studying the two- and three-point functions using nucleon and pion-nucleon interpolating fields. This study is carried out using twisted mass fermion ensembles with pion masses 346 MeV and 131 MeV. We compare the results obtained using these two ensembles and show preliminary results for nucleon charges.
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Spectral analysis for nucleon-pion and nucleon-pion-pion states in both parity sectors using distillation with domain-wall fermions
A distillation-based GEVP analysis resolves nucleon, nucleon-pion, and, for the first time, nucleon-pion-pion states in lattice QCD, with a physical-point nucleon mass of 0.927(21)(05) GeV.