{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:AINC7IVJRMZG7JRDMQZKOFGYJS","short_pith_number":"pith:AINC7IVJ","schema_version":"1.0","canonical_sha256":"021a2fa2a98b326fa6236432a714d84c8af48adfc03216c84e1050b861fadf22","source":{"kind":"arxiv","id":"0911.3619","version":2},"attestation_state":"computed","paper":{"title":"Two-photon exchange corrections to the pion form factor","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph","nucl-ex"],"primary_cat":"nucl-th","authors_text":"J. A. Tjon, P. G. Blunden, W. Melnitchouk","submitted_at":"2009-11-18T18:16:11Z","abstract_excerpt":"We compute two-photon exchange corrections to the electromagnetic form factor of the pion, taking into account the finite size of the pion. Compared to the soft-photon approximation for the infrared divergent contribution which neglects hadron structure effects, the corrections are found to be < 1% for small Q^2 (Q^2 < 0.1 GeV^2), but increase to several percent for Q^2 > 1 GeV^2 at extreme backward angles."},"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":"0911.3619","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2009-11-18T18:16:11Z","cross_cats_sorted":["hep-ph","nucl-ex"],"title_canon_sha256":"4457b830893466186385aa93631356833e27c4dce679d7f04994de2b53150d58","abstract_canon_sha256":"bab42d900a455870d67e5618b40b1367bbad4e9f49a0ef1e6c15b6ac8bedba1b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:20:40.144295Z","signature_b64":"xTMqS66cB/bgKnQuO0lz7/0kwXZj/4cFFTsIkZb0zqWigZXghb2WYr2qhBhQZM9499R5DL3MyVizrZwscaYkCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"021a2fa2a98b326fa6236432a714d84c8af48adfc03216c84e1050b861fadf22","last_reissued_at":"2026-07-04T17:20:40.143819Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:20:40.143819Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Two-photon exchange corrections to the pion form factor","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph","nucl-ex"],"primary_cat":"nucl-th","authors_text":"J. A. Tjon, P. G. Blunden, W. Melnitchouk","submitted_at":"2009-11-18T18:16:11Z","abstract_excerpt":"We compute two-photon exchange corrections to the electromagnetic form factor of the pion, taking into account the finite size of the pion. Compared to the soft-photon approximation for the infrared divergent contribution which neglects hadron structure effects, the corrections are found to be < 1% for small Q^2 (Q^2 < 0.1 GeV^2), but increase to several percent for Q^2 > 1 GeV^2 at extreme backward angles."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0911.3619","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/0911.3619/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"0911.3619","created_at":"2026-07-04T17:20:40.143877+00:00"},{"alias_kind":"arxiv_version","alias_value":"0911.3619v2","created_at":"2026-07-04T17:20:40.143877+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0911.3619","created_at":"2026-07-04T17:20:40.143877+00:00"},{"alias_kind":"pith_short_12","alias_value":"AINC7IVJRMZG","created_at":"2026-07-04T17:20:40.143877+00:00"},{"alias_kind":"pith_short_16","alias_value":"AINC7IVJRMZG7JRD","created_at":"2026-07-04T17:20:40.143877+00:00"},{"alias_kind":"pith_short_8","alias_value":"AINC7IVJ","created_at":"2026-07-04T17:20:40.143877+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/AINC7IVJRMZG7JRDMQZKOFGYJS","json":"https://pith.science/pith/AINC7IVJRMZG7JRDMQZKOFGYJS.json","graph_json":"https://pith.science/api/pith-number/AINC7IVJRMZG7JRDMQZKOFGYJS/graph.json","events_json":"https://pith.science/api/pith-number/AINC7IVJRMZG7JRDMQZKOFGYJS/events.json","paper":"https://pith.science/paper/AINC7IVJ"},"agent_actions":{"view_html":"https://pith.science/pith/AINC7IVJRMZG7JRDMQZKOFGYJS","download_json":"https://pith.science/pith/AINC7IVJRMZG7JRDMQZKOFGYJS.json","view_paper":"https://pith.science/paper/AINC7IVJ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0911.3619&json=true","fetch_graph":"https://pith.science/api/pith-number/AINC7IVJRMZG7JRDMQZKOFGYJS/graph.json","fetch_events":"https://pith.science/api/pith-number/AINC7IVJRMZG7JRDMQZKOFGYJS/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/AINC7IVJRMZG7JRDMQZKOFGYJS/action/timestamp_anchor","attest_storage":"https://pith.science/pith/AINC7IVJRMZG7JRDMQZKOFGYJS/action/storage_attestation","attest_author":"https://pith.science/pith/AINC7IVJRMZG7JRDMQZKOFGYJS/action/author_attestation","sign_citation":"https://pith.science/pith/AINC7IVJRMZG7JRDMQZKOFGYJS/action/citation_signature","submit_replication":"https://pith.science/pith/AINC7IVJRMZG7JRDMQZKOFGYJS/action/replication_record"}},"created_at":"2026-07-04T17:20:40.143877+00:00","updated_at":"2026-07-04T17:20:40.143877+00:00"}