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While there is no reason why the pion-nucleon-nucleon coupling constants should be identical in the real world, one expects that the small differences might be pinned down from a sufficiently large number of independent and mutually consistent data. Our discussion provides a rationale for our recent determination $$f_p^2 = 0.0759(4) \\, , \\quad f_{0}^2 = 0.079(1) \\"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1606.02171","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2016-06-07T15:15:05Z","cross_cats_sorted":["hep-ph","nucl-ex"],"title_canon_sha256":"b6f09ee602bbe346b4ed8d4ffd2d2646ed9b70fe4a3ba665907c58e2fd7d7e3a","abstract_canon_sha256":"b6e5bf58a2bb76c1053a1cc4d21720bd7d9f7f58970eede667904f66f9ea16a3"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:04:18.715266Z","signature_b64":"hDgfdchAMtuIBVDgyKTUVLSqpp0w7wV0Z1wJmVqFjOMwwLwsRyPEnNbEhhAjPMQ8yUeIf7aJnshGDPPsqGU/AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c1b0e348406d6ce1bb47c1eafed78d07eab4258b86bc04a21b89d8e7969faddf","last_reissued_at":"2026-05-18T01:04:18.714686Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:04:18.714686Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Three pion nucleon coupling constants","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph","nucl-ex"],"primary_cat":"nucl-th","authors_text":"E. Ruiz Arriola, J. E. Amaro, R. Navarro Perez","submitted_at":"2016-06-07T15:15:05Z","abstract_excerpt":"There exist four pion nucleon coupling constants, $f_{\\pi^0, pp}$, $-f_{\\pi^0, nn}$, $f_{\\pi^+, pn} /\\sqrt{2}$ and $ f_{\\pi^-, np} /\\sqrt{2}$ which coincide when up and down quark masses are identical and the electron charge is zero. While there is no reason why the pion-nucleon-nucleon coupling constants should be identical in the real world, one expects that the small differences might be pinned down from a sufficiently large number of independent and mutually consistent data. 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