{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:Y4VWXTDSOQQ2KCXO5MDBRQZXXJ","short_pith_number":"pith:Y4VWXTDS","canonical_record":{"source":{"id":"1306.5987","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2013-06-25T14:58:05Z","cross_cats_sorted":[],"title_canon_sha256":"3e9d0cc53fc6876bd51ab8461fe6dc8c0556d7ecdbf296f45b9759fb2cc5ae27","abstract_canon_sha256":"4ffb70863ea3b3bf7fa62aa43ef0421aa8b0081a6ba366e4e3be73c890c12060"},"schema_version":"1.0"},"canonical_sha256":"c72b6bcc727421a50aeeeb0618c337ba6cf9f307d0c3520d80dcf8709973eee4","source":{"kind":"arxiv","id":"1306.5987","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1306.5987","created_at":"2026-05-18T03:19:58Z"},{"alias_kind":"arxiv_version","alias_value":"1306.5987v1","created_at":"2026-05-18T03:19:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1306.5987","created_at":"2026-05-18T03:19:58Z"},{"alias_kind":"pith_short_12","alias_value":"Y4VWXTDSOQQ2","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_16","alias_value":"Y4VWXTDSOQQ2KCXO","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_8","alias_value":"Y4VWXTDS","created_at":"2026-05-18T12:28:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:Y4VWXTDSOQQ2KCXO5MDBRQZXXJ","target":"record","payload":{"canonical_record":{"source":{"id":"1306.5987","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2013-06-25T14:58:05Z","cross_cats_sorted":[],"title_canon_sha256":"3e9d0cc53fc6876bd51ab8461fe6dc8c0556d7ecdbf296f45b9759fb2cc5ae27","abstract_canon_sha256":"4ffb70863ea3b3bf7fa62aa43ef0421aa8b0081a6ba366e4e3be73c890c12060"},"schema_version":"1.0"},"canonical_sha256":"c72b6bcc727421a50aeeeb0618c337ba6cf9f307d0c3520d80dcf8709973eee4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:19:58.019646Z","signature_b64":"czNLzmMxTu+W5azr4g/+fYVtoUJmDxrDtIyztjWmAEWqCo7G/vp6dwsXuzuxn0+vkSEanP0OIl7sIvFK2TiPCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c72b6bcc727421a50aeeeb0618c337ba6cf9f307d0c3520d80dcf8709973eee4","last_reissued_at":"2026-05-18T03:19:58.018991Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:19:58.018991Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1306.5987","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":"2026-05-18T03:19:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2bdMmjb40SttrqX+xh3jkm6HxfPea2VFFvXFOy18bu2NpKH86hzT3TsSiWmi1H2pMQzepMuPBFVMz/xSzGyrDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:40:55.001898Z"},"content_sha256":"d4fd6cb765ffb7884f9d98c029116ecfc8fcab3fd54a9aaa086c93956d593d60","schema_version":"1.0","event_id":"sha256:d4fd6cb765ffb7884f9d98c029116ecfc8fcab3fd54a9aaa086c93956d593d60"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:Y4VWXTDSOQQ2KCXO5MDBRQZXXJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hadronic light-by-light scattering in the muon g-2: impact of proposed measurements of the (pi^0 -> gamma gamma) decay width and the (gamma^* gamma -> pi^0) transition form factor with the KLOE-2 experiment","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Andreas Nyffeler (Harish-Chandra Research Institute)","submitted_at":"2013-06-25T14:58:05Z","abstract_excerpt":"The calculation of the hadronic light-by-light scattering contribution to the muon g-2 currently relies entirely on models. Measurements of the form factors which describe the interactions of hadrons with photons can help to constrain the models and reduce the uncertainty in a_{mu}(had. LbyL) = (116 \\pm 40) x 10^{-11}. In the dominant pion-exchange contribution, the form factor F_{{pi^0}^*gamma^*gamma^*}((q_1 + q_2)^2, q_1^2, q_2^2) with an off-shell pion enters. In general, measurements of the transition form factor F(Q^2) = F_{{pi^0}^*gamma^*gamma^*}(m_{pi}^2, -Q^2, 0) are only sensitive to "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1306.5987","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":"2026-05-18T03:19:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1krVA/aDPe0p2JvcdmhwqgliQyPaPJ29EjOKk0vgMWmq07BqS7N/pYpd8XnMRqJgbzAVCktDX/SncDa3N6b2AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:40:55.002514Z"},"content_sha256":"a30a2db8811926bcba5c24b7282c47ad1eeb9cfab9e080c0fe4084cd7a7fc7bb","schema_version":"1.0","event_id":"sha256:a30a2db8811926bcba5c24b7282c47ad1eeb9cfab9e080c0fe4084cd7a7fc7bb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Y4VWXTDSOQQ2KCXO5MDBRQZXXJ/bundle.json","state_url":"https://pith.science/pith/Y4VWXTDSOQQ2KCXO5MDBRQZXXJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Y4VWXTDSOQQ2KCXO5MDBRQZXXJ/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":"2026-05-26T16:40:55Z","links":{"resolver":"https://pith.science/pith/Y4VWXTDSOQQ2KCXO5MDBRQZXXJ","bundle":"https://pith.science/pith/Y4VWXTDSOQQ2KCXO5MDBRQZXXJ/bundle.json","state":"https://pith.science/pith/Y4VWXTDSOQQ2KCXO5MDBRQZXXJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Y4VWXTDSOQQ2KCXO5MDBRQZXXJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:Y4VWXTDSOQQ2KCXO5MDBRQZXXJ","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":"4ffb70863ea3b3bf7fa62aa43ef0421aa8b0081a6ba366e4e3be73c890c12060","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2013-06-25T14:58:05Z","title_canon_sha256":"3e9d0cc53fc6876bd51ab8461fe6dc8c0556d7ecdbf296f45b9759fb2cc5ae27"},"schema_version":"1.0","source":{"id":"1306.5987","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1306.5987","created_at":"2026-05-18T03:19:58Z"},{"alias_kind":"arxiv_version","alias_value":"1306.5987v1","created_at":"2026-05-18T03:19:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1306.5987","created_at":"2026-05-18T03:19:58Z"},{"alias_kind":"pith_short_12","alias_value":"Y4VWXTDSOQQ2","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_16","alias_value":"Y4VWXTDSOQQ2KCXO","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_8","alias_value":"Y4VWXTDS","created_at":"2026-05-18T12:28:06Z"}],"graph_snapshots":[{"event_id":"sha256:a30a2db8811926bcba5c24b7282c47ad1eeb9cfab9e080c0fe4084cd7a7fc7bb","target":"graph","created_at":"2026-05-18T03:19:58Z","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 calculation of the hadronic light-by-light scattering contribution to the muon g-2 currently relies entirely on models. Measurements of the form factors which describe the interactions of hadrons with photons can help to constrain the models and reduce the uncertainty in a_{mu}(had. LbyL) = (116 \\pm 40) x 10^{-11}. In the dominant pion-exchange contribution, the form factor F_{{pi^0}^*gamma^*gamma^*}((q_1 + q_2)^2, q_1^2, q_2^2) with an off-shell pion enters. In general, measurements of the transition form factor F(Q^2) = F_{{pi^0}^*gamma^*gamma^*}(m_{pi}^2, -Q^2, 0) are only sensitive to ","authors_text":"Andreas Nyffeler (Harish-Chandra Research Institute)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2013-06-25T14:58:05Z","title":"Hadronic light-by-light scattering in the muon g-2: impact of proposed measurements of the (pi^0 -> gamma gamma) decay width and the (gamma^* gamma -> pi^0) transition form factor with the KLOE-2 experiment"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1306.5987","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:d4fd6cb765ffb7884f9d98c029116ecfc8fcab3fd54a9aaa086c93956d593d60","target":"record","created_at":"2026-05-18T03:19:58Z","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":"4ffb70863ea3b3bf7fa62aa43ef0421aa8b0081a6ba366e4e3be73c890c12060","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2013-06-25T14:58:05Z","title_canon_sha256":"3e9d0cc53fc6876bd51ab8461fe6dc8c0556d7ecdbf296f45b9759fb2cc5ae27"},"schema_version":"1.0","source":{"id":"1306.5987","kind":"arxiv","version":1}},"canonical_sha256":"c72b6bcc727421a50aeeeb0618c337ba6cf9f307d0c3520d80dcf8709973eee4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c72b6bcc727421a50aeeeb0618c337ba6cf9f307d0c3520d80dcf8709973eee4","first_computed_at":"2026-05-18T03:19:58.018991Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:19:58.018991Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"czNLzmMxTu+W5azr4g/+fYVtoUJmDxrDtIyztjWmAEWqCo7G/vp6dwsXuzuxn0+vkSEanP0OIl7sIvFK2TiPCA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:19:58.019646Z","signed_message":"canonical_sha256_bytes"},"source_id":"1306.5987","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d4fd6cb765ffb7884f9d98c029116ecfc8fcab3fd54a9aaa086c93956d593d60","sha256:a30a2db8811926bcba5c24b7282c47ad1eeb9cfab9e080c0fe4084cd7a7fc7bb"],"state_sha256":"09c431816657e0a117d9d5a8babde7c101acb2ed344eb1144b03a6b9eeaf40f5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TnaiAd8K7rTY+/1STWJts3AYTr3lzNnP69JmccyxkZq0J3UvWfRRTrJS2Eiyb9FRVAHiXCdZCEsffFUOA8+jBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T16:40:55.006014Z","bundle_sha256":"2c80a13af8c322316314d5e8e1e611cf0b3c282839199d12ea9aa48c0673db75"}}