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These parameters are, in units of $10^{-4} MeV^{-1}$, $(2.20\\pm 0.15)$ and $(-1.86\\pm 0.20)$ respectively. They yield the ratio of the helicity amplitudes for the excitation of N$^*$(1535) by photons off neutrons and protons to be $A^{n}_{1/2}/A^{p}_{1/2}=-0.84\\pm 0.15$, a quantity of fundamental importance in the baryon structure. Best estimate"},"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":"nucl-th/9511001","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"nucl-th","submitted_at":"1995-11-01T19:07:24Z","cross_cats_sorted":["hep-ph"],"title_canon_sha256":"1d603ff69ee675cae144969f6ec9ccd508e9e4ab265eb2bc01266e1304298beb","abstract_canon_sha256":"ce5a3a07151200cbcee02eff57406379b9ca61bd4717ce8b8241f5d69f567a55"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:05:18.549518Z","signature_b64":"A/Z/eaGmpWMZ27B8ti68JgBEv8tyj1veja+LKm2fdCmhXCU9AIYnOVfNnO2+RYnL+7FewII6gLi4xFxZNx9HCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"434135664b66bfc4a53bc2dabcffa994fbeefd4a7d6c7298c014ca358224509a","last_reissued_at":"2026-05-18T01:05:18.548970Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:05:18.548970Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Photoproduction of Etas and N$^*$(1535) Electrostrong Properties","license":"","headline":"","cross_cats":["hep-ph"],"primary_cat":"nucl-th","authors_text":"J. -F. 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