{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:UYW46SV5RDGVS6Z7ZLE3OBTYYA","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"100dfaabc03a44917deed193eddaecd7151abc7ddb7ec18552b803f2cc99131e","cross_cats_sorted":["hep-ex","nucl-th","physics.hist-ph"],"license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"hep-ph","submitted_at":"2009-05-13T05:33:52Z","title_canon_sha256":"0366eb411faf9c201b6545e57f75cdfd5c66cd09eeffde9fdf7720b5de5ea1df"},"schema_version":"1.0","source":{"id":"0905.2017","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0905.2017","created_at":"2026-05-18T02:13:39Z"},{"alias_kind":"arxiv_version","alias_value":"0905.2017v3","created_at":"2026-05-18T02:13:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0905.2017","created_at":"2026-05-18T02:13:39Z"},{"alias_kind":"pith_short_12","alias_value":"UYW46SV5RDGV","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"UYW46SV5RDGVS6Z7","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"UYW46SV5","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:421c0029e3318aae91e90a11003eb854a2339fa6c15e8580600d0d28884c18ba","target":"graph","created_at":"2026-05-18T02:13:39Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"The light scalar mesons, discovered over forty years ago, became a challenge for the naive quark-antiquark model from the outset. At present the nontrivial nature of these states is no longer denied practically anybody. Two-photon physics has made a substantial contribution to understanding the nature of the light scalar mesons. Recently, it entered a new stage of high statistics measurements. We review the results concerning two-photon production mechanisms of the light scalars, based on the analysis of current experimental data.","authors_text":"G.N. Shestakov, N.N. Achasov","cross_cats":["hep-ex","nucl-th","physics.hist-ph"],"headline":"","license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"hep-ph","submitted_at":"2009-05-13T05:33:52Z","title":"Light Scalar Mesons in Photon-Photon Collisions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.2017","kind":"arxiv","version":3},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:427b8213cec3a051e0fdbffc43b3fac3328fe5d0e7ac3dd7ee0a80275c853242","target":"record","created_at":"2026-05-18T02:13:39Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"100dfaabc03a44917deed193eddaecd7151abc7ddb7ec18552b803f2cc99131e","cross_cats_sorted":["hep-ex","nucl-th","physics.hist-ph"],"license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"hep-ph","submitted_at":"2009-05-13T05:33:52Z","title_canon_sha256":"0366eb411faf9c201b6545e57f75cdfd5c66cd09eeffde9fdf7720b5de5ea1df"},"schema_version":"1.0","source":{"id":"0905.2017","kind":"arxiv","version":3}},"canonical_sha256":"a62dcf4abd88cd597b3fcac9b70678c01fefd016cae8d7b0fc4e522ba9f61d27","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a62dcf4abd88cd597b3fcac9b70678c01fefd016cae8d7b0fc4e522ba9f61d27","first_computed_at":"2026-05-18T02:13:39.749569Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:13:39.749569Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IUm948f+Zom5PxMVByR1xztrp/95sg+enKfT/lIOofe51KoQZDgFouH2ECHdn+cZoTRbrC+BmTPjxHjDeBtLCA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:13:39.750085Z","signed_message":"canonical_sha256_bytes"},"source_id":"0905.2017","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:427b8213cec3a051e0fdbffc43b3fac3328fe5d0e7ac3dd7ee0a80275c853242","sha256:421c0029e3318aae91e90a11003eb854a2339fa6c15e8580600d0d28884c18ba"],"state_sha256":"f98a0e46a6d4a1cee9b5a7d329db9e69142968256b6c7f7d9373adb514fb907c"}