{"paper":{"title":"Spin-Parity Analysis of ppbar Mass Threshold Structure in J/psi and psi' Radiative Decays","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"BESIII Collaboration","submitted_at":"2011-12-05T14:37:05Z","abstract_excerpt":"A partial wave analysis of the $p \\bar{p}$ mass-threshold enhancement in the reaction $J/\\psi\\rightarrow\\gamma p\\bar{p}$ is used to determine: its $J^{PC}$ quantum numbers to be $0^{-+}$; its peak mass to be below threshold at $M=1832^{+19}_{-5} {\\rm(stat.)}^{+18}_{-17} {\\rm (syst.)}\\pm19 {\\rm (model)} {\\rm MeV}/c^2$; and its total width to be $\\Gamma<76 {\\rm MeV}/c^2$ at the 90% C.L. The product branching ratio is measured to be $B(J/\\psi\\rightarrow\\gamma X(p\\bar{p}))B(X(p\\bar{p})\\rightarrow p\\bar{p})=(9.0^{+0.4}_{-1.1} {\\rm (stat.)}^{+1.5}_{-5.0} {\\rm (syst.)}\\pm2.3 {\\rm (model)})\\times10^{-"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1112.0942","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"}