{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:PTQUPJJ4QIIJSVY4PTI4EVENX3","short_pith_number":"pith:PTQUPJJ4","canonical_record":{"source":{"id":"2109.09508","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2021-09-15T20:49:09Z","cross_cats_sorted":["nucl-ex"],"title_canon_sha256":"538e28f6bd0c99585ee236f22d21df4b23482389172526b3d342b99e5527645a","abstract_canon_sha256":"52388039f37f5f48482844d7a1236c4e9b971325147805749ce02c0490ee91c6"},"schema_version":"1.0"},"canonical_sha256":"7ce147a53c821099571c7cd1c2548dbeea42b07d84c1aeed1fad44037351398c","source":{"kind":"arxiv","id":"2109.09508","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.09508","created_at":"2026-07-05T04:22:52Z"},{"alias_kind":"arxiv_version","alias_value":"2109.09508v1","created_at":"2026-07-05T04:22:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.09508","created_at":"2026-07-05T04:22:52Z"},{"alias_kind":"pith_short_12","alias_value":"PTQUPJJ4QIIJ","created_at":"2026-07-05T04:22:52Z"},{"alias_kind":"pith_short_16","alias_value":"PTQUPJJ4QIIJSVY4","created_at":"2026-07-05T04:22:52Z"},{"alias_kind":"pith_short_8","alias_value":"PTQUPJJ4","created_at":"2026-07-05T04:22:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:PTQUPJJ4QIIJSVY4PTI4EVENX3","target":"record","payload":{"canonical_record":{"source":{"id":"2109.09508","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2021-09-15T20:49:09Z","cross_cats_sorted":["nucl-ex"],"title_canon_sha256":"538e28f6bd0c99585ee236f22d21df4b23482389172526b3d342b99e5527645a","abstract_canon_sha256":"52388039f37f5f48482844d7a1236c4e9b971325147805749ce02c0490ee91c6"},"schema_version":"1.0"},"canonical_sha256":"7ce147a53c821099571c7cd1c2548dbeea42b07d84c1aeed1fad44037351398c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:22:52.080577Z","signature_b64":"dw9jgYl9UXxbEMZ+uFIDM4+7R7Yk8hJqUVbb4cFSqI0LiyN3BlNle0+M8IN9XZ625ALiNMkC1/uivsS0ANRQBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7ce147a53c821099571c7cd1c2548dbeea42b07d84c1aeed1fad44037351398c","last_reissued_at":"2026-07-05T04:22:52.080014Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:22:52.080014Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2109.09508","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":"2026-07-05T04:22:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aj/Fs9wJ4Rf5w40aOycP6JX1CXuOUgN/5m0/YW5fqdiBZ6ombjN4KHNPgwlWY8DatQFsNw1ORSv2Kfnhgn4iAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T13:15:24.654067Z"},"content_sha256":"5b97e19386d598b6b7a1a9f240b9d1942d28dba9f06327c7162b776848119229","schema_version":"1.0","event_id":"sha256:5b97e19386d598b6b7a1a9f240b9d1942d28dba9f06327c7162b776848119229"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:PTQUPJJ4QIIJSVY4PTI4EVENX3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Characterization of Muon and Electron Beams in the Paul Scherrer Institute PiM1 Channel for the MUSE Experiment","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex"],"primary_cat":"physics.ins-det","authors_text":"A. Akmal, A. Alie, A. Atencio, A. Flannery, A. Golossanov, A. Liyanage, A. Sneath, B. F. Halter, B. Krusche, B. Liang-Gilman, C. Ayerbe Gayoso, C. Collicott, D. Cohen, D. Ghosal, D. Reggiani, E. Cline, E. Downie, E. O. Cohen, E. Piasetzky, E. Rooney, F. Benmokhtar, G. Ron, H. Atac, H. Reid, I. Lavrukhin, I. P. Fernando, J. Campbell, J. C. Bernauer, J. Hirschman, K. Deiters, K. E. Mesick, L. Li, M. Kim, M. Kohl, M. Schwarz, N. Benmouna, N. Sparveris, N. Steinberg, N. Wuerfel, P. E. Reimer, P. G. Solazzo, P. MohanMurthy, P. Moran, P. Or, P. Roy, R. Gilman, R. Mokal, R. S. Raymond, S. Dogra, S. J. Nazeer, S. Strauch, T. Gautam, T. Patel, T. Rauber, T. Rostomyan, V. Sulkosky, W. J. Briscoe, W. Lin, W. Lorenzon, Y. Ilieva","submitted_at":"2021-09-15T20:49:09Z","abstract_excerpt":"The MUon Scattering Experiment, MUSE, at the Paul Scherrer Institute, Switzerland, investigates the proton charge radius puzzle, lepton universality, and two-photon exchange, via simultaneous measurements of elastic muon-proton and electron-proton scattering. The experiment uses the PiM1 secondary beam channel, which was designed for high precision pion scattering measurements. We review the properties of the beam line established for pions. We discuss the production processes that generate the electron and muon beams, and the simulations of these processes. Simulations of the $\\pi$/$\\mu$/$e$ "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.09508","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2109.09508/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T04:22:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4mhpPjSbh4x4b+TyT6gLJgCX4ts8vK7wsQ5N2ALiAIDH1MZ2dpjqd5pLG8JkAzrJQXJHxGps1UN7UW3jNNy9BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T13:15:24.654739Z"},"content_sha256":"eb8402818ba2665b5b468eeccc70101508516fd10b10b3729effbc5df89252f0","schema_version":"1.0","event_id":"sha256:eb8402818ba2665b5b468eeccc70101508516fd10b10b3729effbc5df89252f0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PTQUPJJ4QIIJSVY4PTI4EVENX3/bundle.json","state_url":"https://pith.science/pith/PTQUPJJ4QIIJSVY4PTI4EVENX3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PTQUPJJ4QIIJSVY4PTI4EVENX3/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":"2026-07-05T13:15:24Z","links":{"resolver":"https://pith.science/pith/PTQUPJJ4QIIJSVY4PTI4EVENX3","bundle":"https://pith.science/pith/PTQUPJJ4QIIJSVY4PTI4EVENX3/bundle.json","state":"https://pith.science/pith/PTQUPJJ4QIIJSVY4PTI4EVENX3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PTQUPJJ4QIIJSVY4PTI4EVENX3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:PTQUPJJ4QIIJSVY4PTI4EVENX3","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":"52388039f37f5f48482844d7a1236c4e9b971325147805749ce02c0490ee91c6","cross_cats_sorted":["nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2021-09-15T20:49:09Z","title_canon_sha256":"538e28f6bd0c99585ee236f22d21df4b23482389172526b3d342b99e5527645a"},"schema_version":"1.0","source":{"id":"2109.09508","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.09508","created_at":"2026-07-05T04:22:52Z"},{"alias_kind":"arxiv_version","alias_value":"2109.09508v1","created_at":"2026-07-05T04:22:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.09508","created_at":"2026-07-05T04:22:52Z"},{"alias_kind":"pith_short_12","alias_value":"PTQUPJJ4QIIJ","created_at":"2026-07-05T04:22:52Z"},{"alias_kind":"pith_short_16","alias_value":"PTQUPJJ4QIIJSVY4","created_at":"2026-07-05T04:22:52Z"},{"alias_kind":"pith_short_8","alias_value":"PTQUPJJ4","created_at":"2026-07-05T04:22:52Z"}],"graph_snapshots":[{"event_id":"sha256:eb8402818ba2665b5b468eeccc70101508516fd10b10b3729effbc5df89252f0","target":"graph","created_at":"2026-07-05T04:22:52Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2109.09508/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The MUon Scattering Experiment, MUSE, at the Paul Scherrer Institute, Switzerland, investigates the proton charge radius puzzle, lepton universality, and two-photon exchange, via simultaneous measurements of elastic muon-proton and electron-proton scattering. The experiment uses the PiM1 secondary beam channel, which was designed for high precision pion scattering measurements. We review the properties of the beam line established for pions. We discuss the production processes that generate the electron and muon beams, and the simulations of these processes. Simulations of the $\\pi$/$\\mu$/$e$ ","authors_text":"A. Akmal, A. Alie, A. Atencio, A. Flannery, A. Golossanov, A. Liyanage, A. Sneath, B. F. Halter, B. Krusche, B. Liang-Gilman, C. Ayerbe Gayoso, C. Collicott, D. Cohen, D. Ghosal, D. Reggiani, E. Cline, E. Downie, E. O. Cohen, E. Piasetzky, E. Rooney, F. Benmokhtar, G. Ron, H. Atac, H. Reid, I. Lavrukhin, I. P. Fernando, J. Campbell, J. C. Bernauer, J. Hirschman, K. Deiters, K. E. Mesick, L. Li, M. Kim, M. Kohl, M. Schwarz, N. Benmouna, N. Sparveris, N. Steinberg, N. Wuerfel, P. E. Reimer, P. G. Solazzo, P. MohanMurthy, P. Moran, P. Or, P. Roy, R. Gilman, R. Mokal, R. S. Raymond, S. Dogra, S. J. Nazeer, S. Strauch, T. Gautam, T. Patel, T. Rauber, T. Rostomyan, V. Sulkosky, W. J. Briscoe, W. Lin, W. Lorenzon, Y. Ilieva","cross_cats":["nucl-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2021-09-15T20:49:09Z","title":"Characterization of Muon and Electron Beams in the Paul Scherrer Institute PiM1 Channel for the MUSE Experiment"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.09508","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":"sha256:5b97e19386d598b6b7a1a9f240b9d1942d28dba9f06327c7162b776848119229","target":"record","created_at":"2026-07-05T04:22:52Z","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":"52388039f37f5f48482844d7a1236c4e9b971325147805749ce02c0490ee91c6","cross_cats_sorted":["nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2021-09-15T20:49:09Z","title_canon_sha256":"538e28f6bd0c99585ee236f22d21df4b23482389172526b3d342b99e5527645a"},"schema_version":"1.0","source":{"id":"2109.09508","kind":"arxiv","version":1}},"canonical_sha256":"7ce147a53c821099571c7cd1c2548dbeea42b07d84c1aeed1fad44037351398c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7ce147a53c821099571c7cd1c2548dbeea42b07d84c1aeed1fad44037351398c","first_computed_at":"2026-07-05T04:22:52.080014Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:22:52.080014Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dw9jgYl9UXxbEMZ+uFIDM4+7R7Yk8hJqUVbb4cFSqI0LiyN3BlNle0+M8IN9XZ625ALiNMkC1/uivsS0ANRQBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T04:22:52.080577Z","signed_message":"canonical_sha256_bytes"},"source_id":"2109.09508","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5b97e19386d598b6b7a1a9f240b9d1942d28dba9f06327c7162b776848119229","sha256:eb8402818ba2665b5b468eeccc70101508516fd10b10b3729effbc5df89252f0"],"state_sha256":"7a4d10453563dfca9c37b19a61bdfbb721dc438d4ffec825fd0b4ac0abbbf35e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+66iXSGK31fRyjL6BsBq92iSzXvn21j21gjot5Tfi+rnmSYQFxJo8Lhg2opQntj04FO7gnhNm+E+P6dktRvwCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T13:15:24.657709Z","bundle_sha256":"21a803b08847eb040c1ad8e10f1140285bc35f9cc32b1b2b2d695d799a2cd001"}}