{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2022:66QXDIV6OXMQQPQ7XU3Z5BQECQ","short_pith_number":"pith:66QXDIV6","schema_version":"1.0","canonical_sha256":"f7a171a2be75d9083e1fbd379e8604142d5fe502ede9e3c3dafb4482f9444c59","source":{"kind":"arxiv","id":"2207.08539","version":3},"attestation_state":"computed","paper":{"title":"A $U$-Spin Anomaly in Charm CP Violation","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Stefan Schacht","submitted_at":"2022-07-18T12:02:25Z","abstract_excerpt":"Recent LHCb data shows that the direct CP asymmetries of the decay modes $D^0\\rightarrow \\pi^+\\pi^-$ and $D^0\\rightarrow K^+K^-$ have the same sign, violating an improved $U$-spin limit sum rule in an unexpected way at $2.1\\sigma$. From the new data, we determine for the first time the imaginary part of the CKM-subleading, $U$-spin breaking $\\Delta U=1$ correction to the $U$-spin limit $\\Delta U=0$ amplitude. The imaginary part of the $\\Delta U=0$ amplitude is determined by $\\Delta a_{CP}^{\\mathrm{dir}}$. The corresponding strong phases are yet unknown and could be extracted in the future from"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2207.08539","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2022-07-18T12:02:25Z","cross_cats_sorted":["hep-ex"],"title_canon_sha256":"eff0f6f4602ac559070490b62a5fb9bb1d25f54a874be6b0cc5df167cb15c2c5","abstract_canon_sha256":"ba304c6c6e370a59c703251ea04995914a461303b7d257a0400177cc4374d110"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:59:38.177929Z","signature_b64":"O8AFdUgvXnE6PtqJwj+Pvhb0PldZX163BBweEh8GmN+WSCM986oFrbivvaLpMjZqQwFBLtGk3pP2wxl3PVt2AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f7a171a2be75d9083e1fbd379e8604142d5fe502ede9e3c3dafb4482f9444c59","last_reissued_at":"2026-07-05T05:59:38.177503Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:59:38.177503Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A $U$-Spin Anomaly in Charm CP Violation","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Stefan Schacht","submitted_at":"2022-07-18T12:02:25Z","abstract_excerpt":"Recent LHCb data shows that the direct CP asymmetries of the decay modes $D^0\\rightarrow \\pi^+\\pi^-$ and $D^0\\rightarrow K^+K^-$ have the same sign, violating an improved $U$-spin limit sum rule in an unexpected way at $2.1\\sigma$. From the new data, we determine for the first time the imaginary part of the CKM-subleading, $U$-spin breaking $\\Delta U=1$ correction to the $U$-spin limit $\\Delta U=0$ amplitude. The imaginary part of the $\\Delta U=0$ amplitude is determined by $\\Delta a_{CP}^{\\mathrm{dir}}$. The corresponding strong phases are yet unknown and could be extracted in the future from"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2207.08539","kind":"arxiv","version":3},"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/2207.08539/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2207.08539","created_at":"2026-07-05T05:59:38.177559+00:00"},{"alias_kind":"arxiv_version","alias_value":"2207.08539v3","created_at":"2026-07-05T05:59:38.177559+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2207.08539","created_at":"2026-07-05T05:59:38.177559+00:00"},{"alias_kind":"pith_short_12","alias_value":"66QXDIV6OXMQ","created_at":"2026-07-05T05:59:38.177559+00:00"},{"alias_kind":"pith_short_16","alias_value":"66QXDIV6OXMQQPQ7","created_at":"2026-07-05T05:59:38.177559+00:00"},{"alias_kind":"pith_short_8","alias_value":"66QXDIV6","created_at":"2026-07-05T05:59:38.177559+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":0,"sample":[{"citing_arxiv_id":"2605.04137","citing_title":"CP asymmetries in charged meson decay to two pions","ref_index":70,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/66QXDIV6OXMQQPQ7XU3Z5BQECQ","json":"https://pith.science/pith/66QXDIV6OXMQQPQ7XU3Z5BQECQ.json","graph_json":"https://pith.science/api/pith-number/66QXDIV6OXMQQPQ7XU3Z5BQECQ/graph.json","events_json":"https://pith.science/api/pith-number/66QXDIV6OXMQQPQ7XU3Z5BQECQ/events.json","paper":"https://pith.science/paper/66QXDIV6"},"agent_actions":{"view_html":"https://pith.science/pith/66QXDIV6OXMQQPQ7XU3Z5BQECQ","download_json":"https://pith.science/pith/66QXDIV6OXMQQPQ7XU3Z5BQECQ.json","view_paper":"https://pith.science/paper/66QXDIV6","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2207.08539&json=true","fetch_graph":"https://pith.science/api/pith-number/66QXDIV6OXMQQPQ7XU3Z5BQECQ/graph.json","fetch_events":"https://pith.science/api/pith-number/66QXDIV6OXMQQPQ7XU3Z5BQECQ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/66QXDIV6OXMQQPQ7XU3Z5BQECQ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/66QXDIV6OXMQQPQ7XU3Z5BQECQ/action/storage_attestation","attest_author":"https://pith.science/pith/66QXDIV6OXMQQPQ7XU3Z5BQECQ/action/author_attestation","sign_citation":"https://pith.science/pith/66QXDIV6OXMQQPQ7XU3Z5BQECQ/action/citation_signature","submit_replication":"https://pith.science/pith/66QXDIV6OXMQQPQ7XU3Z5BQECQ/action/replication_record"}},"created_at":"2026-07-05T05:59:38.177559+00:00","updated_at":"2026-07-05T05:59:38.177559+00:00"}