{"paper":{"title":"Constraints on the CKM angle $\\alpha$ from the measured CP asymmetries and branching ratios of $B \\to \\pi^+ \\pi^-, \\pi^+ \\pi^0$ and $K^0\\pi^+$ decays","license":"","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Cai-Dian L\\\"u, Libo Guo, Zhenjun Xiao","submitted_at":"2003-03-10T03:17:43Z","abstract_excerpt":"In this paper, we draw constraints on the Cabibbo-Kobayashi-Maskawa (CKM) angle $\\alpha$ and the strong phase $\\delta$ from the experimental measurements of $\\ssb$, the CP-violating asymmetries and branching ratios of $B \\to \\pi^+ \\pi^-, \\pi^+ \\pi^0$ and $K^0 \\pi^+$ decays. In the SM, the measured $\\ssb$ leads to an upper limit on $\\alpha$: $\\alpha \\leq 180^\\circ-\\beta$. Taking the weighted-average of the newest BaBar and Belle measurements of $\\spp$ and $\\app$ in $B^0 \\to \\pi^+\\pi^-$ decay as the experimental input, we find the allowed range of angle $\\alpha$, $76^\\circ \\leq \\alpha \\leq 135^\\"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0303070","kind":"arxiv","version":4},"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"}