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When included in the world average for the neutron lifetime $\\tau$ = 885.7(7)s, this gives the first element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix $V_{ud} $. With this value and the Particle Data Group values for $V_{us}$ and $V_{ub}$, we find a deviation from the unitarity condition for the first row of the CKM matrix of $\\Delta$ = 0.0083(28), which is 3.0 tim"},"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":"hep-ex/0206058","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-ex","submitted_at":"2002-06-23T23:16:16Z","cross_cats_sorted":[],"title_canon_sha256":"93aa04be47347bfc22f91d0bea08a933431c2d7a64b300efc419982189820fe6","abstract_canon_sha256":"ef51ec039692cde8b4d698695245e01e83ded024119a94af4cdaa4a6fc8af2f7"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:18:10.413837Z","signature_b64":"sgA3W+XlgkTCY8im/MvWJliw+w4okxRj0p6oxOOHnVDE8wpNha71+z2XEx13Y0/Gyy/NeF3pUclGlwCW6ypsCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4f20b7c263a7296086200b022619d8b4963bd31a15e55fe856c5e282e45021f9","last_reissued_at":"2026-07-04T15:18:10.413365Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:18:10.413365Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Is the Unitarity of the quark-mixing-CKM-matrix violated in neutron $\\beta$-decay?","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"D.Dubbers, F. 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