{"paper":{"title":"The pion-pion scattering amplitude. II: Improved analysis above $\\bar{K}K$ threshold","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"F. J. Yndurain, J. R. Pelaez, R. Kaminski","submitted_at":"2006-03-22T10:01:35Z","abstract_excerpt":"We improve, in the energy region between $\\bar{K}K$ threshold and $\\sim~1.4$ GeV, the energy-dependent phase shift analysis of $\\pi\\pi$ scattering presented in a previous paper. For the S0 wave we have included more data above $\\bar{K}K$ threshold and we have taken into account systematically the elasticity data on the reaction $\\pi\\pi\\to\\bar{K}K$. We here made a coupled channel fit. For the D0 wave we have considered information on low energy parameters, and imposed a better fit to the $f_2$ resonance. For both waves the expressions we now find are substantially more precise than the previous"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0603170","kind":"arxiv","version":4},"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"}