{"paper":{"title":"Production of $\\sigma$ in $\\psi(2S)\\to \\pi^{+}\\pi^{-}J/\\psi$","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"BES Collaboration: M. Ablikim, et al","submitted_at":"2006-10-09T08:12:05Z","abstract_excerpt":"Using 14M $\\psi(2S)$ events accumulated by BESII at the BEPC, a Covariant Helicity Amplitude Analysis is performed for $\\psi(2S)\\to\\pi^+\\pi^-J/\\psi, J/\\psi\\to \\mu^+\\mu^-$. The $\\pi^+\\pi^-$ mass spectrum, distinctly different from phase space, suggests $\\sigma$ production in this process. Two different theoretical schemes are used in the global fit to the data. The results are consistent with the existence of the $\\sigma$. The $\\sigma$ pole position is determined to be $(552^{+84}_{-106})-i(232^{+81}_{-72})$ MeV/$c^2$."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/0610023","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"}