{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2000:MGQTFC52IDRFA2GKHZVP6M5IAC","short_pith_number":"pith:MGQTFC52","canonical_record":{"source":{"id":"hep-ph/0004112","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"2000-04-12T14:14:39Z","cross_cats_sorted":[],"title_canon_sha256":"520de4b6d70bffc0fba8fa6b857583dcb2401b2d475b119cf62b9c9f26632bfb","abstract_canon_sha256":"669a1111b45552bb6346669196f65783f74f38f1b037337d1d2ba45a88c2b624"},"schema_version":"1.0"},"canonical_sha256":"61a1328bba40e25068ca3e6aff33a800af151cc9f45e688b51dd2c5873c1e6c1","source":{"kind":"arxiv","id":"hep-ph/0004112","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-ph/0004112","created_at":"2026-05-18T04:13:26Z"},{"alias_kind":"arxiv_version","alias_value":"hep-ph/0004112v1","created_at":"2026-05-18T04:13:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ph/0004112","created_at":"2026-05-18T04:13:26Z"},{"alias_kind":"pith_short_12","alias_value":"MGQTFC52IDRF","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"MGQTFC52IDRFA2GK","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"MGQTFC52","created_at":"2026-05-18T12:25:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2000:MGQTFC52IDRFA2GKHZVP6M5IAC","target":"record","payload":{"canonical_record":{"source":{"id":"hep-ph/0004112","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"2000-04-12T14:14:39Z","cross_cats_sorted":[],"title_canon_sha256":"520de4b6d70bffc0fba8fa6b857583dcb2401b2d475b119cf62b9c9f26632bfb","abstract_canon_sha256":"669a1111b45552bb6346669196f65783f74f38f1b037337d1d2ba45a88c2b624"},"schema_version":"1.0"},"canonical_sha256":"61a1328bba40e25068ca3e6aff33a800af151cc9f45e688b51dd2c5873c1e6c1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:13:26.740348Z","signature_b64":"6yZC8DoOjL4wMrAjxZ/Sx7m2pJXWu0HhhzHTkgN+QD6oCFt+wLw4gGEG/4Wv8MMElNddexFu0Nfmtjvi36//BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"61a1328bba40e25068ca3e6aff33a800af151cc9f45e688b51dd2c5873c1e6c1","last_reissued_at":"2026-05-18T04:13:26.739726Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:13:26.739726Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"hep-ph/0004112","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:13:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hOFz7iYdpHK0ZM3oSWv8aA9RB2dPrtwDPnnjIeTucEIkbRWq5Fqzgg2YGcr57fQLI+f1sMo4VO2tvTKNIYxTDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T22:30:32.365848Z"},"content_sha256":"8fea5c6da2efe50e270a02354649598a56942ac153b007b4bcd21860344dc7cf","schema_version":"1.0","event_id":"sha256:8fea5c6da2efe50e270a02354649598a56942ac153b007b4bcd21860344dc7cf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2000:MGQTFC52IDRFA2GKHZVP6M5IAC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The $\\eta_c\\gamma \\gamma ^*$ transition form factor in the decay $\\eta_c\\to \\gamma \\ell^+\\ell^-$ and in the crossed channels $\\gamma e^-\\to \\eta_c e^- $ and $e^+e^-\\to\\eta_c\\gamma","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Egle Tomasi-Gustafsson, Elvio Di Salvo, Michail P. Rekalo","submitted_at":"2000-04-12T14:14:39Z","abstract_excerpt":"The Dalitz distribution and the effective mass spectrum of the lepton pair produced in the decay $\\eta_c\\to \\gamma \\ell^+ \\ell^-$, as well as the differential cross sections for the crossed channels $\\gamma e^-\\to \\eta_c e^- $ and $e^+ e^-\\to \\eta_c \\gamma$, are calculated in terms of the sole electromagnetic transition form factor for the vertex $\\eta_c\\to\\gamma \\gamma^*$, where $\\gamma^*$ is a virtual photon with a space-like (for $\\gamma e^- \\to \\eta_c e^- $) or a time-like (for $e^+ e^-\\to \\eta_c \\gamma$ and $\\eta_c\\to\\gamma \\ell^+\\ell^-$) four-momentum. Explicit parametrisations of the tr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0004112","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":""},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:13:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aPc+cgvuGlJLi9lxNjaIo3RX1f+AudwQE2y8pWmvSaMQNE+gc9FI8RVPyfDBI9PNwOK/+CoSNL7oHfnQ+zdLCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T22:30:32.366194Z"},"content_sha256":"ca1f895cab5ef05ccc5c2bdb77e1f453d7cfbaa819c2c5a4011ffbab2314b70f","schema_version":"1.0","event_id":"sha256:ca1f895cab5ef05ccc5c2bdb77e1f453d7cfbaa819c2c5a4011ffbab2314b70f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MGQTFC52IDRFA2GKHZVP6M5IAC/bundle.json","state_url":"https://pith.science/pith/MGQTFC52IDRFA2GKHZVP6M5IAC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MGQTFC52IDRFA2GKHZVP6M5IAC/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-30T22:30:32Z","links":{"resolver":"https://pith.science/pith/MGQTFC52IDRFA2GKHZVP6M5IAC","bundle":"https://pith.science/pith/MGQTFC52IDRFA2GKHZVP6M5IAC/bundle.json","state":"https://pith.science/pith/MGQTFC52IDRFA2GKHZVP6M5IAC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MGQTFC52IDRFA2GKHZVP6M5IAC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2000:MGQTFC52IDRFA2GKHZVP6M5IAC","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":"669a1111b45552bb6346669196f65783f74f38f1b037337d1d2ba45a88c2b624","cross_cats_sorted":[],"license":"","primary_cat":"hep-ph","submitted_at":"2000-04-12T14:14:39Z","title_canon_sha256":"520de4b6d70bffc0fba8fa6b857583dcb2401b2d475b119cf62b9c9f26632bfb"},"schema_version":"1.0","source":{"id":"hep-ph/0004112","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-ph/0004112","created_at":"2026-05-18T04:13:26Z"},{"alias_kind":"arxiv_version","alias_value":"hep-ph/0004112v1","created_at":"2026-05-18T04:13:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ph/0004112","created_at":"2026-05-18T04:13:26Z"},{"alias_kind":"pith_short_12","alias_value":"MGQTFC52IDRF","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"MGQTFC52IDRFA2GK","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"MGQTFC52","created_at":"2026-05-18T12:25:50Z"}],"graph_snapshots":[{"event_id":"sha256:ca1f895cab5ef05ccc5c2bdb77e1f453d7cfbaa819c2c5a4011ffbab2314b70f","target":"graph","created_at":"2026-05-18T04:13:26Z","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 Dalitz distribution and the effective mass spectrum of the lepton pair produced in the decay $\\eta_c\\to \\gamma \\ell^+ \\ell^-$, as well as the differential cross sections for the crossed channels $\\gamma e^-\\to \\eta_c e^- $ and $e^+ e^-\\to \\eta_c \\gamma$, are calculated in terms of the sole electromagnetic transition form factor for the vertex $\\eta_c\\to\\gamma \\gamma^*$, where $\\gamma^*$ is a virtual photon with a space-like (for $\\gamma e^- \\to \\eta_c e^- $) or a time-like (for $e^+ e^-\\to \\eta_c \\gamma$ and $\\eta_c\\to\\gamma \\ell^+\\ell^-$) four-momentum. Explicit parametrisations of the tr","authors_text":"Egle Tomasi-Gustafsson, Elvio Di Salvo, Michail P. Rekalo","cross_cats":[],"headline":"","license":"","primary_cat":"hep-ph","submitted_at":"2000-04-12T14:14:39Z","title":"The $\\eta_c\\gamma \\gamma ^*$ transition form factor in the decay $\\eta_c\\to \\gamma \\ell^+\\ell^-$ and in the crossed channels $\\gamma e^-\\to \\eta_c e^- $ and $e^+e^-\\to\\eta_c\\gamma"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0004112","kind":"arxiv","version":1},"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":"sha256:8fea5c6da2efe50e270a02354649598a56942ac153b007b4bcd21860344dc7cf","target":"record","created_at":"2026-05-18T04:13:26Z","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":"669a1111b45552bb6346669196f65783f74f38f1b037337d1d2ba45a88c2b624","cross_cats_sorted":[],"license":"","primary_cat":"hep-ph","submitted_at":"2000-04-12T14:14:39Z","title_canon_sha256":"520de4b6d70bffc0fba8fa6b857583dcb2401b2d475b119cf62b9c9f26632bfb"},"schema_version":"1.0","source":{"id":"hep-ph/0004112","kind":"arxiv","version":1}},"canonical_sha256":"61a1328bba40e25068ca3e6aff33a800af151cc9f45e688b51dd2c5873c1e6c1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"61a1328bba40e25068ca3e6aff33a800af151cc9f45e688b51dd2c5873c1e6c1","first_computed_at":"2026-05-18T04:13:26.739726Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:13:26.739726Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6yZC8DoOjL4wMrAjxZ/Sx7m2pJXWu0HhhzHTkgN+QD6oCFt+wLw4gGEG/4Wv8MMElNddexFu0Nfmtjvi36//BA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:13:26.740348Z","signed_message":"canonical_sha256_bytes"},"source_id":"hep-ph/0004112","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8fea5c6da2efe50e270a02354649598a56942ac153b007b4bcd21860344dc7cf","sha256:ca1f895cab5ef05ccc5c2bdb77e1f453d7cfbaa819c2c5a4011ffbab2314b70f"],"state_sha256":"5f78d8c01f948ad5a73d7f7e8b2e4f57ec74a65f07baa7fe307e41e18f9f7433"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Xxfs3wd/fPisYdk0jhb3v7netLCEhmetSLAVyGkfcDfXb74FHsFXTcGE6oyLy+7c8+kWlFOs3z+NSkBoIA0JDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T22:30:32.368575Z","bundle_sha256":"37e2e06b9d98bb6d6cd72df139921ea7338888ffbaabdbdb500b70a8f596970e"}}