{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:KVNW5PZFS5TZJUDYEXDIIVVTXF","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":"c939dead3b0b39a54efc11b2657a885757e37d6d5e13975543d06ce54c98e874","cross_cats_sorted":["physics.ins-det","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2014-03-11T11:59:23Z","title_canon_sha256":"913713a081839becfc6d64eab0deaad15d5a254d4ebe1b04a05e0d20e2526148"},"schema_version":"1.0","source":{"id":"1403.2547","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1403.2547","created_at":"2026-05-18T02:53:55Z"},{"alias_kind":"arxiv_version","alias_value":"1403.2547v2","created_at":"2026-05-18T02:53:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1403.2547","created_at":"2026-05-18T02:53:55Z"},{"alias_kind":"pith_short_12","alias_value":"KVNW5PZFS5TZ","created_at":"2026-05-18T12:28:35Z"},{"alias_kind":"pith_short_16","alias_value":"KVNW5PZFS5TZJUDY","created_at":"2026-05-18T12:28:35Z"},{"alias_kind":"pith_short_8","alias_value":"KVNW5PZF","created_at":"2026-05-18T12:28:35Z"}],"graph_snapshots":[{"event_id":"sha256:d2574fe2cd2e88a3bdcad6269d81dece7b2f82df5251c43dc5abc011fcc8d2d0","target":"graph","created_at":"2026-05-18T02:53:55Z","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":"We report the first results of a search for real photon-photon scattering using X rays. A novel system is developed to split and collide X-ray pulses by applying interferometric techniques. A total of $6.5\\times10^{5}$ pulses (each containing about $10^{11}$ photons) from an X-ray Free-Electron Laser are injected into the system. No scattered events are observed, and an upper limit of $1.7\\times 10^{-24}$ ${\\rm m^{2}}$ (95% C.L.) is obtained on the photon-photon elastic scattering cross section at 6.5 keV.","authors_text":"K. Sawada, K. Tamasaku, M. Yabashi, S. Adachi, S. Asai, T. Inada, T. Ishikawa, T. Kobayashi, T. Namba, T. Yamaji, Y. Inubushi, Y. Tanaka","cross_cats":["physics.ins-det","physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2014-03-11T11:59:23Z","title":"Search for Photon-Photon Elastic Scattering in the X-ray Region"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1403.2547","kind":"arxiv","version":2},"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:aeff8a476757a6975e71ecde882233f3308192263f7f80daf924acf06ecbef31","target":"record","created_at":"2026-05-18T02:53:55Z","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":"c939dead3b0b39a54efc11b2657a885757e37d6d5e13975543d06ce54c98e874","cross_cats_sorted":["physics.ins-det","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2014-03-11T11:59:23Z","title_canon_sha256":"913713a081839becfc6d64eab0deaad15d5a254d4ebe1b04a05e0d20e2526148"},"schema_version":"1.0","source":{"id":"1403.2547","kind":"arxiv","version":2}},"canonical_sha256":"555b6ebf25976794d07825c68456b3b944cd038744f696de6d5faafd11062794","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"555b6ebf25976794d07825c68456b3b944cd038744f696de6d5faafd11062794","first_computed_at":"2026-05-18T02:53:55.803213Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:53:55.803213Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"V+dHtn9K9oJyLxYgzVbxz7ToXppt5njwhmY2lsKyYjdaxN3tXMwHSOARUcYm0lbHuKRiiITwpVGL3q8DV+0jDA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:53:55.804166Z","signed_message":"canonical_sha256_bytes"},"source_id":"1403.2547","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:aeff8a476757a6975e71ecde882233f3308192263f7f80daf924acf06ecbef31","sha256:d2574fe2cd2e88a3bdcad6269d81dece7b2f82df5251c43dc5abc011fcc8d2d0"],"state_sha256":"e9d51b04036207ee5cfe745e71165268cdef308eb7991a89e74a37f01957f51c"}