{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1999:P2UTEY22TXK6GFFMYOFSRF7V2T","short_pith_number":"pith:P2UTEY22","canonical_record":{"source":{"id":"hep-lat/9909003","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-lat","submitted_at":"1999-09-01T13:18:13Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"7a18d20b5c2fbe64777fefae103923e0ef7d462111185395499993593e4f1b46","abstract_canon_sha256":"031a409c6d7e4445a49052a25eab5ba0e4fa94fab693d7f754901d8bb09d68cc"},"schema_version":"1.0"},"canonical_sha256":"7ea932635a9dd5e314acc38b2897f5d4f8513dbe3192e23f5dba7b3350d17de0","source":{"kind":"arxiv","id":"hep-lat/9909003","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-lat/9909003","created_at":"2026-05-18T01:39:11Z"},{"alias_kind":"arxiv_version","alias_value":"hep-lat/9909003v1","created_at":"2026-05-18T01:39:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-lat/9909003","created_at":"2026-05-18T01:39:11Z"},{"alias_kind":"pith_short_12","alias_value":"P2UTEY22TXK6","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"P2UTEY22TXK6GFFM","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"P2UTEY22","created_at":"2026-05-18T12:25:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1999:P2UTEY22TXK6GFFMYOFSRF7V2T","target":"record","payload":{"canonical_record":{"source":{"id":"hep-lat/9909003","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-lat","submitted_at":"1999-09-01T13:18:13Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"7a18d20b5c2fbe64777fefae103923e0ef7d462111185395499993593e4f1b46","abstract_canon_sha256":"031a409c6d7e4445a49052a25eab5ba0e4fa94fab693d7f754901d8bb09d68cc"},"schema_version":"1.0"},"canonical_sha256":"7ea932635a9dd5e314acc38b2897f5d4f8513dbe3192e23f5dba7b3350d17de0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:39:11.307965Z","signature_b64":"ehKG5zpq5bhuSxWSeJO5kZER2jpUOe0wSMDQ07AND/0TVn/AVUn55RxtT1rVp8MH7rthP9frgR0RNkRt+NahAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7ea932635a9dd5e314acc38b2897f5d4f8513dbe3192e23f5dba7b3350d17de0","last_reissued_at":"2026-05-18T01:39:11.307541Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:39:11.307541Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"hep-lat/9909003","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":"2026-05-18T01:39:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Vl6QmDTYmRdKhdRuH9ZyfGgw1ClaWzhtHcb9W8LAmKjNrdhVOHQn04navxGoEIOYv7g437d7KEoEd9EYuhgBCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T18:22:05.395203Z"},"content_sha256":"fab4ebf8923690e4a69e45ea8d2d8823f1003230d628d3037c2b6677c3ca665e","schema_version":"1.0","event_id":"sha256:fab4ebf8923690e4a69e45ea8d2d8823f1003230d628d3037c2b6677c3ca665e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1999:P2UTEY22TXK6GFFMYOFSRF7V2T","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A local formulation of lattice QCD without unphysical fermion zero modes","license":"","headline":"","cross_cats":["hep-th"],"primary_cat":"hep-lat","authors_text":"Peter Weisz, Pietro Antonio Grassi, Roberto Frezzotti, Stefan Sint","submitted_at":"1999-09-01T13:18:13Z","abstract_excerpt":"The problem of unphysical zero modes in lattice QCD with Wilson fermions can be solved in a clean way by including a mass term proportional to $i \\psibar \\gamma_5 \\tau^3 \\psi$ in the standard lattice theory with Nf=2 mass degenerate Wilson quarks. We argue that up to cutoff effects, this lattice theory is equivalent to standard lattice QCD, for suitable choices of the mass parameters and with a natural re-interpretation of observables. On-shell O(a) improvement can be implemented in a straightforward way."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-lat/9909003","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":"2026-05-18T01:39:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aOHgRay+NNcjb8z5e1+XI4Ib0Q9gdDpQ/316wE9VGhA+JCM8v833H5pmmQTFrQ6Ra5OAxkmnCMErvqcwE5fgCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T18:22:05.395866Z"},"content_sha256":"2d676ecbd5ff2917cb4209d4f27de6cd0642d3a2bb005e8c70e235813b845044","schema_version":"1.0","event_id":"sha256:2d676ecbd5ff2917cb4209d4f27de6cd0642d3a2bb005e8c70e235813b845044"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/P2UTEY22TXK6GFFMYOFSRF7V2T/bundle.json","state_url":"https://pith.science/pith/P2UTEY22TXK6GFFMYOFSRF7V2T/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/P2UTEY22TXK6GFFMYOFSRF7V2T/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":"2026-05-28T18:22:05Z","links":{"resolver":"https://pith.science/pith/P2UTEY22TXK6GFFMYOFSRF7V2T","bundle":"https://pith.science/pith/P2UTEY22TXK6GFFMYOFSRF7V2T/bundle.json","state":"https://pith.science/pith/P2UTEY22TXK6GFFMYOFSRF7V2T/state.json","well_known_bundle":"https://pith.science/.well-known/pith/P2UTEY22TXK6GFFMYOFSRF7V2T/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:P2UTEY22TXK6GFFMYOFSRF7V2T","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":"031a409c6d7e4445a49052a25eab5ba0e4fa94fab693d7f754901d8bb09d68cc","cross_cats_sorted":["hep-th"],"license":"","primary_cat":"hep-lat","submitted_at":"1999-09-01T13:18:13Z","title_canon_sha256":"7a18d20b5c2fbe64777fefae103923e0ef7d462111185395499993593e4f1b46"},"schema_version":"1.0","source":{"id":"hep-lat/9909003","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-lat/9909003","created_at":"2026-05-18T01:39:11Z"},{"alias_kind":"arxiv_version","alias_value":"hep-lat/9909003v1","created_at":"2026-05-18T01:39:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-lat/9909003","created_at":"2026-05-18T01:39:11Z"},{"alias_kind":"pith_short_12","alias_value":"P2UTEY22TXK6","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"P2UTEY22TXK6GFFM","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"P2UTEY22","created_at":"2026-05-18T12:25:49Z"}],"graph_snapshots":[{"event_id":"sha256:2d676ecbd5ff2917cb4209d4f27de6cd0642d3a2bb005e8c70e235813b845044","target":"graph","created_at":"2026-05-18T01:39:11Z","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 problem of unphysical zero modes in lattice QCD with Wilson fermions can be solved in a clean way by including a mass term proportional to $i \\psibar \\gamma_5 \\tau^3 \\psi$ in the standard lattice theory with Nf=2 mass degenerate Wilson quarks. We argue that up to cutoff effects, this lattice theory is equivalent to standard lattice QCD, for suitable choices of the mass parameters and with a natural re-interpretation of observables. On-shell O(a) improvement can be implemented in a straightforward way.","authors_text":"Peter Weisz, Pietro Antonio Grassi, Roberto Frezzotti, Stefan Sint","cross_cats":["hep-th"],"headline":"","license":"","primary_cat":"hep-lat","submitted_at":"1999-09-01T13:18:13Z","title":"A local formulation of lattice QCD without unphysical fermion zero modes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-lat/9909003","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:fab4ebf8923690e4a69e45ea8d2d8823f1003230d628d3037c2b6677c3ca665e","target":"record","created_at":"2026-05-18T01:39:11Z","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":"031a409c6d7e4445a49052a25eab5ba0e4fa94fab693d7f754901d8bb09d68cc","cross_cats_sorted":["hep-th"],"license":"","primary_cat":"hep-lat","submitted_at":"1999-09-01T13:18:13Z","title_canon_sha256":"7a18d20b5c2fbe64777fefae103923e0ef7d462111185395499993593e4f1b46"},"schema_version":"1.0","source":{"id":"hep-lat/9909003","kind":"arxiv","version":1}},"canonical_sha256":"7ea932635a9dd5e314acc38b2897f5d4f8513dbe3192e23f5dba7b3350d17de0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7ea932635a9dd5e314acc38b2897f5d4f8513dbe3192e23f5dba7b3350d17de0","first_computed_at":"2026-05-18T01:39:11.307541Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:39:11.307541Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ehKG5zpq5bhuSxWSeJO5kZER2jpUOe0wSMDQ07AND/0TVn/AVUn55RxtT1rVp8MH7rthP9frgR0RNkRt+NahAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:39:11.307965Z","signed_message":"canonical_sha256_bytes"},"source_id":"hep-lat/9909003","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fab4ebf8923690e4a69e45ea8d2d8823f1003230d628d3037c2b6677c3ca665e","sha256:2d676ecbd5ff2917cb4209d4f27de6cd0642d3a2bb005e8c70e235813b845044"],"state_sha256":"fa208239142a305b3a968f20067eef5685c1d9ef10740dc50049a083fe6a51eb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8n/S5Mc+u0m4H669se0+6D49c+lAq8C3EVE9vnNGpv2fjDX58WWAWAJ/g++KnHzL0uTkDhomn91cy+SfWidnBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T18:22:05.399217Z","bundle_sha256":"6d55e43610085e04f272ad011f419ceafc913057b8fb2eee2c072ba0d535ac43"}}