{"paper":{"title":"Extended analysis of the \"penguin\" part of $K\\to\\pi\\pi$ amplitude","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"A.A.Penin, A.A.Pivovarov","submitted_at":"1995-03-14T09:29:58Z","abstract_excerpt":"We make an attempt to clarify the role of the annihilation or \"penguin\" mode in the description of the $K\\rightarrow\\pi\\pi$ decay within the Standard Model. The attention is concentrated on new operators in the effective $\\Delta S=1$ Hamiltonian and the violation of factorization for mesonic matrix elements of the local four-quark operators. We propose a regular method to evaluate the mesonic matrix elements of $K\\rightarrow\\pi\\pi$ transitions based on studying three-point correlators via {\\it QCD} sum rules using the chiral effective theory as an underlying low-energy model for strong interac"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9503322","kind":"arxiv","version":1},"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"}