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The inclusion of the two-loop effects is one of the steps necessary to extract $\\bar{m}_{b}(\\bar{m}_{b})$ with a precision better than ${\\cal O}(\\Lambda_{QCD})$, which is the uncertainty due to the presence of an IR renormalon singularity in the perturbative series of the res"},"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-lat/9909138","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-lat","submitted_at":"1999-09-21T18:26:07Z","cross_cats_sorted":["hep-ph"],"title_canon_sha256":"590750febaa5092b61bbd668f09990d92bc52231125f20e26df852058ac1dc18","abstract_canon_sha256":"565858081da7077d80bb1481ac642b230727d031ca127c8a387389387ecfa4e5"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:39:10.581124Z","signature_b64":"qEIRLcDgSY4+Vy4vTTeSZM8uc83JAi4EykQcbJj10CxRMaPE0KyniNjv5dJNSU0AUy2qQD0DgS/MtH2TlrxCBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9899160bdb53e5bfd4680d4f3d4bce9a88183e560ec1bd2bb2845bc821046707","last_reissued_at":"2026-05-18T01:39:10.580562Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:39:10.580562Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"NNLO unquenched calculation of the b quark mass","license":"","headline":"","cross_cats":["hep-ph"],"primary_cat":"hep-lat","authors_text":"F. 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