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The data were collected by the CDF detector at the Fermilab Tevatron collider during 1992-95 and correspond to about 110 pb-1 of p-bar p collisions at sqrt(s)=1.8 TeV. We measure decay lengths and extract the lifetimes to be tau(B-) = 1.637 +/- 0.058 +0.045 -0.043 ps, tau(B0) = 1.474 +/- 0.039 +0.052 -0.051 ps, and the ratio of the lifetimes to be tau(B-)/tau(B0) = 1.110 +/- 0.056 +0.033 -0.030, where the first uncertainties a"},"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/9806018","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-ex","submitted_at":"1998-06-18T23:20:09Z","cross_cats_sorted":[],"title_canon_sha256":"56243c3b88c58e81d4e3ef32d519a09906f3745865e79686a2d658b04636d99f","abstract_canon_sha256":"cad3c912f989147312180a6ff08ea2aa70d05f974bd3f351689f3b4823e04206"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:28:41.691175Z","signature_b64":"TIJ8cNqQQJanv1FDBQu0x+vUz2qPkBP7EqWW74eYPePz582KSNlPwIHq7cgD8Xol/8cVmbzD0xqVY/PFDcTnAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"edee46e8acab9fb270fed01d1ae92538f536abe8e2000d49e4d3fa8bcc1296ac","last_reissued_at":"2026-07-04T17:28:41.690754Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:28:41.690754Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Improved Measurement of the B- and B0-bar Meson Lifetimes Using Semileptonic Decays","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"et al. 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