{"paper":{"title":"Improving the Kpi vector form factor through Kl3 constraints","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Diogo R. Boito, Matthias Jamin, Rafel Escribano","submitted_at":"2010-12-15T23:27:04Z","abstract_excerpt":"The $K\\pi$ vector form factor, $F_+^{K\\pi}$, used to reproduce the Belle spectrum of $\\tauKpi$ decays is described by means of a three-times subtracted dispersion relation also incorporating constraints from $K_{l3}$ decays. The slope and curvature of $F_+^{K\\pi}$ are fitted to the data yielding $\\lambda_+'=(25.49 \\pm 0.31) \\times 10^{-3}$ and $\\lambda_+\"= (12.22 \\pm 0.14) \\times 10^{-4}$. The pole parameters of the $K^*(892)^\\pm$ are found to be $m_{K^*(892)^\\pm}= 892.0\\pm 0.5$ MeV and $\\Gamma_{K^*(892)^\\pm}= 46.5 \\pm1.1$ MeV. The phase-space integrals relevant for $K_{l3}$ analyses and the $"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1012.3493","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"}