{"paper":{"title":"Study of $B\\to K^{(*)} \\ell^+\\ell^-$ Decays in the Family Non-universal $Z'$ Models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Cai-Dian L\\\"u, Cheng-Wei Chiang, Run-Hui Li","submitted_at":"2009-11-12T14:20:48Z","abstract_excerpt":"In a combined investigation of the $B\\to K^{(*)}\\ell^+\\ell^-$ decays, constraints on the related couplings in family non-universal $Z^{\\prime}$ models are derived. We find that within the allowed parameter space, the recently observed forward-backward asymmetry in the $B\\to K^*\\ell^+\\ell^-$ decay can be explained, by flipping the signs of the Wilson coefficients $C_9^{\\rm eff}$ and $C_{10}$. With the obtained constraints, we also calculate the branching ratio of the $B_s\\to\\mu^+\\mu^-$ decay. The upper bound of our prediction is near the upper bound given by CDF Collaboration recently."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0911.2399","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"}