{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:OEASR73ZPSBYSFFMU5AHAML4LX","short_pith_number":"pith:OEASR73Z","schema_version":"1.0","canonical_sha256":"710128ff797c838914aca74070317c5dc38a752420482f94cadad7df3f2c88aa","source":{"kind":"arxiv","id":"2107.10447","version":1},"attestation_state":"computed","paper":{"title":"Using coherent dipion photoproduction to image gold nuclei","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"nucl-ex","authors_text":"Spencer R. Klein (for the STAR Collaboration)","submitted_at":"2021-07-22T04:09:38Z","abstract_excerpt":"Vector meson photoproduction offers the opportunity to image target nuclei. The two-dimensional Fourier transform $d\\sigma_{\\rm coherent}/dt$ of coherent vector meson photoproduction gives the two-dimensional distribution of interaction sites in the target. Since vector meson photoproduction occurs, at lowest order, via two-gluon exchange, this is sensitive to gluon shadowing. We present an analysis of $\\pi^+\\pi^-$ photoproduction using data from the STAR detector and a study of $d\\sigma_{\\rm coherent}/dt$, with an emphasis on probing the nuclear shape and its systematic uncertainties."},"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":"2107.10447","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2021-07-22T04:09:38Z","cross_cats_sorted":["hep-ex"],"title_canon_sha256":"9057a3420de8fea76912e86ccccc8d2435997c5582b32195d60ff4b02bd375f8","abstract_canon_sha256":"b7d0e3dcdc280d8e6085f0cf0699e159fe243e10479dce8d67d44d258f57bef4"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:00:00.004040Z","signature_b64":"Lht5sHNbQl+DZqC19kxErxp9cas5qW2lZn3E1+6dEPnSQ+ArgMLDO3LMMbg5/0TXGawidCsaVAAjxdb9nQwnAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"710128ff797c838914aca74070317c5dc38a752420482f94cadad7df3f2c88aa","last_reissued_at":"2026-07-05T03:00:00.003609Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:00:00.003609Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Using coherent dipion photoproduction to image gold nuclei","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"nucl-ex","authors_text":"Spencer R. Klein (for the STAR Collaboration)","submitted_at":"2021-07-22T04:09:38Z","abstract_excerpt":"Vector meson photoproduction offers the opportunity to image target nuclei. The two-dimensional Fourier transform $d\\sigma_{\\rm coherent}/dt$ of coherent vector meson photoproduction gives the two-dimensional distribution of interaction sites in the target. Since vector meson photoproduction occurs, at lowest order, via two-gluon exchange, this is sensitive to gluon shadowing. We present an analysis of $\\pi^+\\pi^-$ photoproduction using data from the STAR detector and a study of $d\\sigma_{\\rm coherent}/dt$, with an emphasis on probing the nuclear shape and its systematic uncertainties."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.10447","kind":"arxiv","version":1},"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/2107.10447/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":"2107.10447","created_at":"2026-07-05T03:00:00.003666+00:00"},{"alias_kind":"arxiv_version","alias_value":"2107.10447v1","created_at":"2026-07-05T03:00:00.003666+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.10447","created_at":"2026-07-05T03:00:00.003666+00:00"},{"alias_kind":"pith_short_12","alias_value":"OEASR73ZPSBY","created_at":"2026-07-05T03:00:00.003666+00:00"},{"alias_kind":"pith_short_16","alias_value":"OEASR73ZPSBYSFFM","created_at":"2026-07-05T03:00:00.003666+00:00"},{"alias_kind":"pith_short_8","alias_value":"OEASR73Z","created_at":"2026-07-05T03:00:00.003666+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/OEASR73ZPSBYSFFMU5AHAML4LX","json":"https://pith.science/pith/OEASR73ZPSBYSFFMU5AHAML4LX.json","graph_json":"https://pith.science/api/pith-number/OEASR73ZPSBYSFFMU5AHAML4LX/graph.json","events_json":"https://pith.science/api/pith-number/OEASR73ZPSBYSFFMU5AHAML4LX/events.json","paper":"https://pith.science/paper/OEASR73Z"},"agent_actions":{"view_html":"https://pith.science/pith/OEASR73ZPSBYSFFMU5AHAML4LX","download_json":"https://pith.science/pith/OEASR73ZPSBYSFFMU5AHAML4LX.json","view_paper":"https://pith.science/paper/OEASR73Z","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2107.10447&json=true","fetch_graph":"https://pith.science/api/pith-number/OEASR73ZPSBYSFFMU5AHAML4LX/graph.json","fetch_events":"https://pith.science/api/pith-number/OEASR73ZPSBYSFFMU5AHAML4LX/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/OEASR73ZPSBYSFFMU5AHAML4LX/action/timestamp_anchor","attest_storage":"https://pith.science/pith/OEASR73ZPSBYSFFMU5AHAML4LX/action/storage_attestation","attest_author":"https://pith.science/pith/OEASR73ZPSBYSFFMU5AHAML4LX/action/author_attestation","sign_citation":"https://pith.science/pith/OEASR73ZPSBYSFFMU5AHAML4LX/action/citation_signature","submit_replication":"https://pith.science/pith/OEASR73ZPSBYSFFMU5AHAML4LX/action/replication_record"}},"created_at":"2026-07-05T03:00:00.003666+00:00","updated_at":"2026-07-05T03:00:00.003666+00:00"}