{"paper":{"title":"Penguins in B decays","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Michael Gronau","submitted_at":"2001-10-24T18:49:08Z","abstract_excerpt":"We report on recent progress in studying two aspects of $B$ physics, in which penguin amplitudes play an important role: (1) Bounds on penguin pollution in $B^0(t) \\to \\pi^+\\pi^-$ constraining CKM parameters, and a lower bound on $B^0 \\to \\pi^0\\pi^0$ improving precision in $\\sin 2\\alpha$. (2) A suggestion for measuring the photon polarization in electroweak penguin decay, $B \\to K_1(1400)\\gamma$, providing a precision test of the Standard Model and a probe for new physics."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0110316","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"}