{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:H2ALGNGLNDEBAYQXXW2HLXKLFH","short_pith_number":"pith:H2ALGNGL","canonical_record":{"source":{"id":"2512.19482","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ex","submitted_at":"2025-12-22T15:34:49Z","cross_cats_sorted":["physics.data-an","physics.ins-det"],"title_canon_sha256":"00213f1ed70b5c2e33df5fab8f393cc14f6f6c46d26f5332973592b1d2594e46","abstract_canon_sha256":"7bf057d9bc031ede2a7a163b7447930cc2a94f1485aa5beb826d2f6613933d2c"},"schema_version":"1.0"},"canonical_sha256":"3e80b334cb68c8106217bdb475dd4b29f09bb6356a8f50af860159c40f6d616e","source":{"kind":"arxiv","id":"2512.19482","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2512.19482","created_at":"2026-07-03T01:17:16Z"},{"alias_kind":"arxiv_version","alias_value":"2512.19482v2","created_at":"2026-07-03T01:17:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2512.19482","created_at":"2026-07-03T01:17:16Z"},{"alias_kind":"pith_short_12","alias_value":"H2ALGNGLNDEB","created_at":"2026-07-03T01:17:16Z"},{"alias_kind":"pith_short_16","alias_value":"H2ALGNGLNDEBAYQX","created_at":"2026-07-03T01:17:16Z"},{"alias_kind":"pith_short_8","alias_value":"H2ALGNGL","created_at":"2026-07-03T01:17:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:H2ALGNGLNDEBAYQXXW2HLXKLFH","target":"record","payload":{"canonical_record":{"source":{"id":"2512.19482","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ex","submitted_at":"2025-12-22T15:34:49Z","cross_cats_sorted":["physics.data-an","physics.ins-det"],"title_canon_sha256":"00213f1ed70b5c2e33df5fab8f393cc14f6f6c46d26f5332973592b1d2594e46","abstract_canon_sha256":"7bf057d9bc031ede2a7a163b7447930cc2a94f1485aa5beb826d2f6613933d2c"},"schema_version":"1.0"},"canonical_sha256":"3e80b334cb68c8106217bdb475dd4b29f09bb6356a8f50af860159c40f6d616e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-03T01:17:16.002385Z","signature_b64":"MNw6deiGo2Iby4fKPo7UHYIvQ6CZYyUzbjOSFxvvYwY3uqcqEEAjrAKwDmZMgfY/v0/UZKk9mcTMNLVbcdjOBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3e80b334cb68c8106217bdb475dd4b29f09bb6356a8f50af860159c40f6d616e","last_reissued_at":"2026-07-03T01:17:16.001884Z","signature_status":"signed_v1","first_computed_at":"2026-07-03T01:17:16.001884Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2512.19482","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":"2026-07-03T01:17:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+SCONZWqPpyeSG4FM8hx2ZyyAdZrucVLSt3THiH3zY2UfUglaZAAMpqzN4DMBco1IwmMPIZcJBVI6XVEOJ/rAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T08:08:59.257580Z"},"content_sha256":"ba6dec57c00fd60462ef79eb304ccde5c0ea1a39ece6f163c0f5b22706401d21","schema_version":"1.0","event_id":"sha256:ba6dec57c00fd60462ef79eb304ccde5c0ea1a39ece6f163c0f5b22706401d21"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:H2ALGNGLNDEBAYQXXW2HLXKLFH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Transformer-Based Approach to Enhance Positron Tracking Performance in MEG II","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["physics.data-an","physics.ins-det"],"primary_cat":"hep-ex","authors_text":"Antoine Venturini, Atsushi Oya, Fedor Ignatov, Lapo Dispoto, Yusuke Uchiyama","submitted_at":"2025-12-22T15:34:49Z","abstract_excerpt":"We developed a Transformer-based pattern recognition method for positron track reconstruction in the MEG II experiment. The model acts as a classifier to remove pileup hits in the MEG II drift chamber, which operates under a high pileup occupancy of 35 - 50 %. The trained model significantly improved hit purity, leading to enhancements in tracking efficiency and resolution by 15 % and 5 %, respectively, at a muon stopping rate of $5\\times 10^7 \\mu$/sec. This improvement translates into an approximately 10 % increase in the sensitivity of the $\\mu\\to e\\gamma$ branching ratio measurement."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2512.19482","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2512.19482/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":"2026-07-03T01:17:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9QCKjZ7TIgcyufFHMRZSsdlaeK3/P4pPow1F8hJs1Qw2hoUYXzXnP1lF1CauSh1RfwdSViciIZcKvh9XuPqqDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T08:08:59.258094Z"},"content_sha256":"64b305dc034c21b0165123de5bc58fefa54d5fefcd2012f911901f1957a32f03","schema_version":"1.0","event_id":"sha256:64b305dc034c21b0165123de5bc58fefa54d5fefcd2012f911901f1957a32f03"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/H2ALGNGLNDEBAYQXXW2HLXKLFH/bundle.json","state_url":"https://pith.science/pith/H2ALGNGLNDEBAYQXXW2HLXKLFH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/H2ALGNGLNDEBAYQXXW2HLXKLFH/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":"2026-08-04T08:08:59Z","links":{"resolver":"https://pith.science/pith/H2ALGNGLNDEBAYQXXW2HLXKLFH","bundle":"https://pith.science/pith/H2ALGNGLNDEBAYQXXW2HLXKLFH/bundle.json","state":"https://pith.science/pith/H2ALGNGLNDEBAYQXXW2HLXKLFH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/H2ALGNGLNDEBAYQXXW2HLXKLFH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:H2ALGNGLNDEBAYQXXW2HLXKLFH","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":"7bf057d9bc031ede2a7a163b7447930cc2a94f1485aa5beb826d2f6613933d2c","cross_cats_sorted":["physics.data-an","physics.ins-det"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ex","submitted_at":"2025-12-22T15:34:49Z","title_canon_sha256":"00213f1ed70b5c2e33df5fab8f393cc14f6f6c46d26f5332973592b1d2594e46"},"schema_version":"1.0","source":{"id":"2512.19482","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2512.19482","created_at":"2026-07-03T01:17:16Z"},{"alias_kind":"arxiv_version","alias_value":"2512.19482v2","created_at":"2026-07-03T01:17:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2512.19482","created_at":"2026-07-03T01:17:16Z"},{"alias_kind":"pith_short_12","alias_value":"H2ALGNGLNDEB","created_at":"2026-07-03T01:17:16Z"},{"alias_kind":"pith_short_16","alias_value":"H2ALGNGLNDEBAYQX","created_at":"2026-07-03T01:17:16Z"},{"alias_kind":"pith_short_8","alias_value":"H2ALGNGL","created_at":"2026-07-03T01:17:16Z"}],"graph_snapshots":[{"event_id":"sha256:64b305dc034c21b0165123de5bc58fefa54d5fefcd2012f911901f1957a32f03","target":"graph","created_at":"2026-07-03T01:17:16Z","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/2512.19482/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We developed a Transformer-based pattern recognition method for positron track reconstruction in the MEG II experiment. The model acts as a classifier to remove pileup hits in the MEG II drift chamber, which operates under a high pileup occupancy of 35 - 50 %. The trained model significantly improved hit purity, leading to enhancements in tracking efficiency and resolution by 15 % and 5 %, respectively, at a muon stopping rate of $5\\times 10^7 \\mu$/sec. This improvement translates into an approximately 10 % increase in the sensitivity of the $\\mu\\to e\\gamma$ branching ratio measurement.","authors_text":"Antoine Venturini, Atsushi Oya, Fedor Ignatov, Lapo Dispoto, Yusuke Uchiyama","cross_cats":["physics.data-an","physics.ins-det"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ex","submitted_at":"2025-12-22T15:34:49Z","title":"Transformer-Based Approach to Enhance Positron Tracking Performance in MEG II"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2512.19482","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:ba6dec57c00fd60462ef79eb304ccde5c0ea1a39ece6f163c0f5b22706401d21","target":"record","created_at":"2026-07-03T01:17:16Z","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":"7bf057d9bc031ede2a7a163b7447930cc2a94f1485aa5beb826d2f6613933d2c","cross_cats_sorted":["physics.data-an","physics.ins-det"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ex","submitted_at":"2025-12-22T15:34:49Z","title_canon_sha256":"00213f1ed70b5c2e33df5fab8f393cc14f6f6c46d26f5332973592b1d2594e46"},"schema_version":"1.0","source":{"id":"2512.19482","kind":"arxiv","version":2}},"canonical_sha256":"3e80b334cb68c8106217bdb475dd4b29f09bb6356a8f50af860159c40f6d616e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3e80b334cb68c8106217bdb475dd4b29f09bb6356a8f50af860159c40f6d616e","first_computed_at":"2026-07-03T01:17:16.001884Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-03T01:17:16.001884Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MNw6deiGo2Iby4fKPo7UHYIvQ6CZYyUzbjOSFxvvYwY3uqcqEEAjrAKwDmZMgfY/v0/UZKk9mcTMNLVbcdjOBQ==","signature_status":"signed_v1","signed_at":"2026-07-03T01:17:16.002385Z","signed_message":"canonical_sha256_bytes"},"source_id":"2512.19482","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ba6dec57c00fd60462ef79eb304ccde5c0ea1a39ece6f163c0f5b22706401d21","sha256:64b305dc034c21b0165123de5bc58fefa54d5fefcd2012f911901f1957a32f03"],"state_sha256":"12d3f560386b7367c6325155a88830b978ed6064ca632aaa7c53569b461b45bf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xPmNBCrXY0At+OPQBvk7n2cMHqh7+vGkkqUcjJqenuWMHcNKlNJdqpmYJSUKwOsnidf4m9q/Osk44Wh9vK21CA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T08:08:59.261697Z","bundle_sha256":"d5b5ecc51fadc617643868adb8545cb681c83bfffa23ea9c6515f15ad3c83660"}}