{"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. Gl\\\"uck, H.Abele, J.Reich, M.Astruc Hoffmann, O.Zimmer, S.Baessler, U.M\\\"uller, V.Nesvizhevsky","submitted_at":"2002-06-23T23:16:16Z","abstract_excerpt":"We report on a new measurement of neutron $\\beta$-decay asymmetry. From the result \\linebreak $A_0$ = -0.1189(7), we derive the ratio of the axial vector to the vector coupling constant $\\lambda$ = ${\\it g_A/g_V}$ = -1.2739(19). 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"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/0206058","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/hep-ex/0206058/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"}