{"paper":{"title":"Measurement of CP Asymmetries and Branching Fractions in Charmless Two-Body B-Meson Decays to Pions and Kaons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"The BABAR Collaboration","submitted_at":"2012-06-15T17:33:45Z","abstract_excerpt":"We present improved measurements of CP-violation parameters in the decays $B^0 \\to \\pi^+ \\pi^-$, $B^0 \\to K^+ \\pi^-$, and $B^0 \\to \\pi^0 \\pi^0$, and of the branching fractions for $B^0 \\to \\pi^0 \\pi^0$ and $B^0 \\to K^0 \\pi^0$. The results are obtained with the full data set collected at the $\\Upsilon(4S)$ resonance by the BABAR experiment at the PEP-II asymmetric-energy $B$ factory at the SLAC National Accelerator Laboratory, corresponding to $467 \\pm 5$ million $B\\bar B$ pairs. We find the CP-violation parameter values and branching fractions $ S_{\\pi^+\\pi^-} = -0.68 \\pm 0.10 \\pm 0.03, C_{\\pi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1206.3525","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"}