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Bertolini","submitted_at":"1993-12-13T15:02:23Z","abstract_excerpt":"The standard model contribution to $\\epsilon'/\\epsilon$ of the magnetic- and electric-dipole penguin operators $Q_{11} = \\frac{g_s}{16\\pi^2} \\, m_s \\: \\bar{s}\\, \\sigma_{\\mu\\nu} t^a G^{\\mu\\nu}_a (1-\\gamma_5 )\\, d $ and $Q_{12} = \\frac{eQ_d}{16\\pi^2}\\, m_s \\: \\bar{s}\\, \\sigma_{\\mu\\nu}\n  F^{\\mu\\nu} (1-\\gamma_5 )\\, d $ is discussed. While the electromagnetic penguin $Q_{12}$ seems to have a vanishingly small matrix element, we find that the gluonic dipole operator $Q_{11}$ may give a contribution to $\\epsilon'/\\epsilon$ comparable to that of other operators so far considered, and should therefore "},"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-ph/9312266","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"1993-12-13T15:02:23Z","cross_cats_sorted":[],"title_canon_sha256":"187346837339a8d2b736ba155a9ea370c708e0adbbcaa8892e6b6b3e80c73821","abstract_canon_sha256":"59b3ef7ae60a3a88a7afaade7dfbcbea9107e4b0f15bb54b73223d3b8ddb39e2"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:37:54.293269Z","signature_b64":"z4V4FoSvIaaP+iSrwsALOC84fVWEeNrWAt/WRdBYyez0WSnntX7VKP5eLWLIByEShIFSL6vzyn40i1jFz0lHAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5a228420a87f9873f0f94df0afaba659f46d8b39651173006ca7bcb0826d4050","last_reissued_at":"2026-05-18T04:37:54.292662Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:37:54.292662Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Relevance of the Dipole Penguin Operators in $\\epsilon'/\\epsilon$","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"E. 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