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We obtain the results $$a_0^{(0)}=0.233\\pm0.013 M^{-1}_\\pi,\\quad b_0^{(0)}=0.285\\pm0.012 M^{-3}_\\pi$$ and, for th"},"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":"hep-ph/0701025","kind":"arxiv","version":3},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"2007-01-04T10:24:14Z","cross_cats_sorted":[],"title_canon_sha256":"e2236eb8ebebe3824aadd1ff7df8ef70d67311754abcda49b7e8f40703efdcbc","abstract_canon_sha256":"f213f33855a4188a70320a2a2525000499a9cace4882c1d879b0f66995404481"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:22:06.834611Z","signature_b64":"OWLHlitUimRXR7W4CcPYksi569jzOLwFdxfxSIl74+IsqxkgHtW0bhiPozCmEJa3Sf7D6BwRMBzrACXpOCX0AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fa0a03e422e86afc05ee7f058f14243e46cc74e0d282e140e0e14a9dbbccedc6","last_reissued_at":"2026-07-04T15:22:06.834205Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:22:06.834205Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Experimental status of the $\\pi\\pi$ isoscalar S wave at low energy: $f_0(600)$ pole and scattering length","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"F. 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