Using large-volume lattice QCD at physical quark masses, the PACS Collaboration shows that a new excited-state subtraction makes the nucleon pseudoscalar and induced-pseudoscalar form factors consistent with pion-pole dominance up to q^2 ~ 0.42 GeV^2.
QCD Accurately Predicts the Induced Pseudoscalar Coupling Constant
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abstract
Using chiral Ward identities of QCD, we derive a relation for the induced pseudoscalar coupling constant which is accurate within a few percent, $g_P = 8.44 \pm 0.16$.
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Investigating the axial structure of the nucleon based on large-volume lattice QCD at the physical point
Using large-volume lattice QCD at physical quark masses, the PACS Collaboration shows that a new excited-state subtraction makes the nucleon pseudoscalar and induced-pseudoscalar form factors consistent with pion-pole dominance up to q^2 ~ 0.42 GeV^2.