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Thus the conventional $q\\bar{q}$ bound-state description of the pion could not be valid since it would produce a $\\pi^{0}\\to \\gamma\\gamma$ decay amplitude not suppressed in the soft pion limit, in contradiction with the Sutherland-Veltman theorem. Therefore, if the pion is to be treated as a $q\\bar{q}$ bound state, this bound state would be a longitudina"},"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":"1302.2431","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2013-02-11T10:12:36Z","cross_cats_sorted":["hep-ex"],"title_canon_sha256":"c9186ad29edfda3cb0476ae3037fd2f2dd7f8d0093e8615b482c1d4f9844868c","abstract_canon_sha256":"177d7df21e04a47f605eecf1a54ef7f34bcfbf6ecf29947d07f747872bea8fa3"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:20:09.272431Z","signature_b64":"Vbmaql7x7qjJgC9eCNvnh43mIK04IWD2Q4yuUMY5IOi8+aWHFsptTC8WgUPYesag91AHh4YI6+zGNb7IGtHTAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6943b234573fb52656a1979c7416232d2332700be9669be9db64f82afaac6e6a","last_reissued_at":"2026-05-18T03:20:09.271706Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:20:09.271706Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Pion as a Longitudinal Axial-Vector Meson $q\\bar{q}$ Bound State","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"T. 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