{"paper":{"title":"Semileptonic B_c-meson decays in sum rules of QCD and NRQCD","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"A.I.Onishchenko, A.K.Likhoded, V.V.Kiselev","submitted_at":"1999-05-17T05:48:29Z","abstract_excerpt":"The semileptonic B_c-meson decays into the heavy quarkonia J/\\psi (\\eta_c) and a pair of leptons are investigated in the framework of three-point sum rules of QCD and NRQCD. Calculations of analytical expressions for the spectral densities of QCD and NRQCD correlators with account for the Coulomb-like \\alpha_s/v terms are presented. The generalized relations due to the spin symmetry of NRQCD for the form factors of B_c\\to J/\\psi (\\eta_c)l\\nu_l transitions with l denoting one of the leptons e, \\mu or \\tau, are derived at the recoil momentum close to zero. This allows one to express all NRQCD fo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9905359","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"}