{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:MGPVF2ZEIBZVZ2GGKIF7IW6MS4","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":"9d3f3473edf79d5a32946c50353489af56030d3410e7699568e6507467ef3f92","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2008-10-27T19:56:27Z","title_canon_sha256":"13566e0bf2c2f414c7bc47a3b1b14729efc5e97437c4e76ad6d5a74c3fc5582c"},"schema_version":"1.0","source":{"id":"0810.4918","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0810.4918","created_at":"2026-07-04T15:15:29Z"},{"alias_kind":"arxiv_version","alias_value":"0810.4918v1","created_at":"2026-07-04T15:15:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0810.4918","created_at":"2026-07-04T15:15:29Z"},{"alias_kind":"pith_short_12","alias_value":"MGPVF2ZEIBZV","created_at":"2026-07-04T15:15:29Z"},{"alias_kind":"pith_short_16","alias_value":"MGPVF2ZEIBZVZ2GG","created_at":"2026-07-04T15:15:29Z"},{"alias_kind":"pith_short_8","alias_value":"MGPVF2ZE","created_at":"2026-07-04T15:15:29Z"}],"graph_snapshots":[{"event_id":"sha256:7ba410ee275ff37bdc17abe73cd620902ee09582cc5839665df748037e64bd2e","target":"graph","created_at":"2026-07-04T15:15:29Z","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/0810.4918/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The ratio of branching ratios in leptonic pion decay $R_{\\pi} \\equiv (\\Gamma(\\pi^- \\to e \\nu_e))/(\\Gamma(\\pi^- \\to \\mu \\nu_\\mu))$ is a powerfully sensitive probe of new interactions beyond the electroweak standard model. This is due to the chirality suppression of the standard model amplitude for the decay, which results in a precise prediction for the ratio, and suppressed amplitudes for new contributions to interfere with. We calculate, including QCD corrections, the contributions to $R_{\\pi}$ arising from a broad selection of standard model extensions to which it is sensitive, including: R-","authors_text":"Ahmed Ismail, Bruce A. Campbell","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2008-10-27T19:56:27Z","title":"Leptonic Pion Decay And Physics Beyond The Electroweak Standard Model"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0810.4918","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:e2720518d20fa7ea86e314ba46ad626e8be6167d1b920a2f53ed380566fce1bf","target":"record","created_at":"2026-07-04T15:15:29Z","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":"9d3f3473edf79d5a32946c50353489af56030d3410e7699568e6507467ef3f92","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2008-10-27T19:56:27Z","title_canon_sha256":"13566e0bf2c2f414c7bc47a3b1b14729efc5e97437c4e76ad6d5a74c3fc5582c"},"schema_version":"1.0","source":{"id":"0810.4918","kind":"arxiv","version":1}},"canonical_sha256":"619f52eb2440735ce8c6520bf45bcc973866b5b95dbdea13db6d080991f72cbd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"619f52eb2440735ce8c6520bf45bcc973866b5b95dbdea13db6d080991f72cbd","first_computed_at":"2026-07-04T15:15:29.281252Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:15:29.281252Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vhOhIuEJ8bML3ix8FkMlGix5FaUZvpCEzsETTuERfhJq30yFpHRZ46I4lZqQcvOBkanCiuQ24b64xzgmUUs5DA==","signature_status":"signed_v1","signed_at":"2026-07-04T15:15:29.281634Z","signed_message":"canonical_sha256_bytes"},"source_id":"0810.4918","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e2720518d20fa7ea86e314ba46ad626e8be6167d1b920a2f53ed380566fce1bf","sha256:7ba410ee275ff37bdc17abe73cd620902ee09582cc5839665df748037e64bd2e"],"state_sha256":"8f36f883e6b5d8379cb7c35da12500b9f29c8aa03485c03e1f0909075825943b"}