{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:WDQHSAHCBTUBW557A2EHQ62MM4","short_pith_number":"pith:WDQHSAHC","canonical_record":{"source":{"id":"1612.07684","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2016-12-22T16:27:36Z","cross_cats_sorted":["hep-ex"],"title_canon_sha256":"959b888a2c6e76e420ddfcbccddc7954d8d4cb7b855f6037188fcaf2d3e50f59","abstract_canon_sha256":"1ecf0eb88ee2fb1184833c968a0375b9eebf2e47e21c89ea7da6cdb3a9f7cef3"},"schema_version":"1.0"},"canonical_sha256":"b0e07900e20ce81b77bf0688787b4c6701bdd30148977187055e19e045911ba7","source":{"kind":"arxiv","id":"1612.07684","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.07684","created_at":"2026-05-18T00:23:40Z"},{"alias_kind":"arxiv_version","alias_value":"1612.07684v2","created_at":"2026-05-18T00:23:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.07684","created_at":"2026-05-18T00:23:40Z"},{"alias_kind":"pith_short_12","alias_value":"WDQHSAHCBTUB","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"WDQHSAHCBTUBW557","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"WDQHSAHC","created_at":"2026-05-18T12:30:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:WDQHSAHCBTUBW557A2EHQ62MM4","target":"record","payload":{"canonical_record":{"source":{"id":"1612.07684","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2016-12-22T16:27:36Z","cross_cats_sorted":["hep-ex"],"title_canon_sha256":"959b888a2c6e76e420ddfcbccddc7954d8d4cb7b855f6037188fcaf2d3e50f59","abstract_canon_sha256":"1ecf0eb88ee2fb1184833c968a0375b9eebf2e47e21c89ea7da6cdb3a9f7cef3"},"schema_version":"1.0"},"canonical_sha256":"b0e07900e20ce81b77bf0688787b4c6701bdd30148977187055e19e045911ba7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:23:40.371364Z","signature_b64":"lfRQiaKsoPqIw+5l1KhgeFAIbXRo4CAJjObpSGKGzWdGn0jDYuGMh4lCYRyNH8FGOpa0woq7uJ4JXelAkz96Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b0e07900e20ce81b77bf0688787b4c6701bdd30148977187055e19e045911ba7","last_reissued_at":"2026-05-18T00:23:40.370750Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:23:40.370750Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1612.07684","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:23:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eVCKl25oLoeHdZZgcH06Q5/688uZ1A+zGljEb6sYXtoFZjfjZI6wNlaL6ca3T1mjfWjyHucgSpy09yYM2qBWCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T04:58:13.510184Z"},"content_sha256":"c60991d6be401dff0838bdbabad0d36f2b47ba37645ec7f0f4d08c2aa2e4d843","schema_version":"1.0","event_id":"sha256:c60991d6be401dff0838bdbabad0d36f2b47ba37645ec7f0f4d08c2aa2e4d843"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:WDQHSAHCBTUBW557A2EHQ62MM4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The proton radius puzzle","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"physics.ins-det","authors_text":"M. Bonesini","submitted_at":"2016-12-22T16:27:36Z","abstract_excerpt":"The FAMU (Fisica degli Atomi Muonici) experiment has the goal to measure precisely the proton Zemach radius, thus contributing to the solution of the so-called proton radius puzzle. To this aim, it makes use of a high-intensity pulsed muon beam at RIKEN-RAL impinging on a cryogenic hydrogen target with an high-Z gas admixture and a tunable mid-IR high power laser, to measure the hyperfine (HFS) splitting of the 1S state of the muonic hydrogen. From the value of the exciting laser frequency, the energy of the HFS transition may be derived with high precision and thus, via QED calculations, the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.07684","kind":"arxiv","version":2},"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":"2026-05-18T00:23:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C7CqaGQB9iMlfzb9o8OJlBarakIHt0inyDrgIcPqLE0xUCSSwOFETRJQZe7A4lO5ICaHrtq6rc8LFlX1nfYWAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T04:58:13.510590Z"},"content_sha256":"ca96df99de5c87c0b60470bdc00a9884f578fb64af7478aaa082aa0e211e9fea","schema_version":"1.0","event_id":"sha256:ca96df99de5c87c0b60470bdc00a9884f578fb64af7478aaa082aa0e211e9fea"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WDQHSAHCBTUBW557A2EHQ62MM4/bundle.json","state_url":"https://pith.science/pith/WDQHSAHCBTUBW557A2EHQ62MM4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WDQHSAHCBTUBW557A2EHQ62MM4/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":"2026-05-26T04:58:13Z","links":{"resolver":"https://pith.science/pith/WDQHSAHCBTUBW557A2EHQ62MM4","bundle":"https://pith.science/pith/WDQHSAHCBTUBW557A2EHQ62MM4/bundle.json","state":"https://pith.science/pith/WDQHSAHCBTUBW557A2EHQ62MM4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WDQHSAHCBTUBW557A2EHQ62MM4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:WDQHSAHCBTUBW557A2EHQ62MM4","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":"1ecf0eb88ee2fb1184833c968a0375b9eebf2e47e21c89ea7da6cdb3a9f7cef3","cross_cats_sorted":["hep-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2016-12-22T16:27:36Z","title_canon_sha256":"959b888a2c6e76e420ddfcbccddc7954d8d4cb7b855f6037188fcaf2d3e50f59"},"schema_version":"1.0","source":{"id":"1612.07684","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.07684","created_at":"2026-05-18T00:23:40Z"},{"alias_kind":"arxiv_version","alias_value":"1612.07684v2","created_at":"2026-05-18T00:23:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.07684","created_at":"2026-05-18T00:23:40Z"},{"alias_kind":"pith_short_12","alias_value":"WDQHSAHCBTUB","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"WDQHSAHCBTUBW557","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"WDQHSAHC","created_at":"2026-05-18T12:30:48Z"}],"graph_snapshots":[{"event_id":"sha256:ca96df99de5c87c0b60470bdc00a9884f578fb64af7478aaa082aa0e211e9fea","target":"graph","created_at":"2026-05-18T00:23:40Z","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 FAMU (Fisica degli Atomi Muonici) experiment has the goal to measure precisely the proton Zemach radius, thus contributing to the solution of the so-called proton radius puzzle. To this aim, it makes use of a high-intensity pulsed muon beam at RIKEN-RAL impinging on a cryogenic hydrogen target with an high-Z gas admixture and a tunable mid-IR high power laser, to measure the hyperfine (HFS) splitting of the 1S state of the muonic hydrogen. From the value of the exciting laser frequency, the energy of the HFS transition may be derived with high precision and thus, via QED calculations, the ","authors_text":"M. Bonesini","cross_cats":["hep-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2016-12-22T16:27:36Z","title":"The proton radius puzzle"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.07684","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:c60991d6be401dff0838bdbabad0d36f2b47ba37645ec7f0f4d08c2aa2e4d843","target":"record","created_at":"2026-05-18T00:23:40Z","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":"1ecf0eb88ee2fb1184833c968a0375b9eebf2e47e21c89ea7da6cdb3a9f7cef3","cross_cats_sorted":["hep-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2016-12-22T16:27:36Z","title_canon_sha256":"959b888a2c6e76e420ddfcbccddc7954d8d4cb7b855f6037188fcaf2d3e50f59"},"schema_version":"1.0","source":{"id":"1612.07684","kind":"arxiv","version":2}},"canonical_sha256":"b0e07900e20ce81b77bf0688787b4c6701bdd30148977187055e19e045911ba7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b0e07900e20ce81b77bf0688787b4c6701bdd30148977187055e19e045911ba7","first_computed_at":"2026-05-18T00:23:40.370750Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:23:40.370750Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lfRQiaKsoPqIw+5l1KhgeFAIbXRo4CAJjObpSGKGzWdGn0jDYuGMh4lCYRyNH8FGOpa0woq7uJ4JXelAkz96Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:23:40.371364Z","signed_message":"canonical_sha256_bytes"},"source_id":"1612.07684","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c60991d6be401dff0838bdbabad0d36f2b47ba37645ec7f0f4d08c2aa2e4d843","sha256:ca96df99de5c87c0b60470bdc00a9884f578fb64af7478aaa082aa0e211e9fea"],"state_sha256":"e917eff33503f33dde041457695e017e0874b99f88e9322c40a710cefdade1f2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HaDtNelln9Ko9HnA0b5vlYvSNWiV2ivim2woSFVtG4eviETbFsdOZubwGM5OGNURc8azPUFKiwZv96yAsHUODA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T04:58:13.514148Z","bundle_sha256":"2f7174da65184a25ab9bf66ef0b9d5abd9fcf4e0d13b4f8f74c5f4241b52f095"}}