{"paper":{"title":"Study of Pure Annihilation Decays B_{d,s} \\to D^{0} \\bar D^{0}","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Juan Hua, Ying Li","submitted_at":"2007-11-21T09:08:38Z","abstract_excerpt":"With heavy quark limit and hierarchy approximation $\\lambda_{QCD}\\ll m_D\\ll m_B$, we analyze the $B\\to D^0\\bar D^0$ and $B_s\\to D^0\\bar D^0$ decays, which occur purely via annihilation type diagrams. As a roughly estimation, we calculate their branching ratios and CP asymmetries in Perturbative QCD approach. The branching ratio of $B\\to D^0\\bar D^0$ is about $3.8\\times10^{-5}$ that is just below the latest experimental upper limit. The branching ratio of $B_s\\to D^0\\bar D^0$ is about $6.8\\times10^{-4}$, which could be measured in LHC-b. From the calculation, it could be found that this branchi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0711.3282","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"}