{"paper":{"title":"The Relevance of the Dipole Penguin Operators in $\\epsilon'/\\epsilon$","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"E. Gabrielli, M. Fabbrichesi, S. 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 "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9312266","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"}