{"paper":{"title":"$\\bar B_s\\to K$ semileptonic decay from an Omn\\`es improved constituent quark model","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","nucl-th"],"primary_cat":"hep-ph","authors_text":"C. Albertus, C. Hidalgo-Duque, E. Hern\\'andez, J.Nieves","submitted_at":"2014-04-03T16:34:51Z","abstract_excerpt":"We study the $f^+$ form factor for the semileptonic $\\bar B_s\\to K^+\\ell^-\\bar\\nu_\\ell$ decay in a constituent quark model. The valence quark estimate is supplemented with the contribution from the $\\bar B^*$ pole that dominates the high $q^2$ region. We use a multiply-subtracted Omn\\`es dispersion relation to extend the quark model predictions from its region of applicability near $q^2_{\\rm max}=(M_{B_s}-M_K)^2\\sim 23.75$ GeV$^2$ to all $q^2$ values accessible in the physical decay. To better constrain the dependence of $f^+$ on $q^2$, we fit the subtraction constants to a combined input from"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1404.1001","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"}