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Vagnoni","submitted_at":"2009-08-24T17:26:42Z","abstract_excerpt":"The recently measured B -> tau nu branching ratio allows to test the Standard Model by probing virtual effects of new heavy particles, such as a charged Higgs boson. The accuracy of the test is currently limited by the experimental error on BR(B -> tau nu) and by the uncertainty on the parameters fB and |Vub|. The redundancy of the Unitarity Triangle fit allows to reduce the error on these parameters and thus to perform a more precise test of the Standard Model. Using the current experimental inputs, we obtain BR(B -> tau nu)_SM = (0.84 +- 0.11)x10^{-4}, to be compared with BR(B -> tau nu)_exp"},"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":"0908.3470","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2009-08-24T17:26:42Z","cross_cats_sorted":[],"title_canon_sha256":"3dd1826c6227a005054ee4e3c45203c7d347ca94b63099b0387d5520a0af350b","abstract_canon_sha256":"4ba7309a46dbfda803854d7a7f07ed8b994d7e86c2d57c772d8b9e1cec8ebb7c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:34:37.413853Z","signature_b64":"T1Ut1/TqNr8dIslxk4w07T9dWtm994+qcLdCM8EAry4tNFNIVpZBBST4C6t6PDfyyVIjQLn5cR8x9sNXgHyxDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"98ae87850eacc49936a8b44b11cd449836a59d79c0c9504aa1b7eb48758b50e8","last_reissued_at":"2026-05-18T02:34:37.413299Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:34:37.413299Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"An Improved Standard Model Prediction Of BR(B -> tau nu) And Its Implications For New Physics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"A. 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