{"paper":{"title":"Dipion invariant mass spectrum in $X(3872) \\to J/\\psi \\pi \\pi$","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"P. Ko (KAIST), Taewon Kim","submitted_at":"2004-05-26T16:17:47Z","abstract_excerpt":"It is pointed out that dipion invariant mass spectrum in $X (3872) \\to \\pi \\pi J/\\psi$ is a useful probe for the $J^{PC}$ quantum number of the X(3872), complementary to the angular distributions. If X(3872) is a $^1 P_1$ state, the dipion has a peak at low $m_{\\pi\\pi}$ region, which is not in accord with the preliminary Belle data. If X(3872) is a $^3 D_2$ or $^3 D_3$ state, the dipion spectrum shows a peak at high $m_{\\pi\\pi}$ region, which is broader than the $\\rho$ resonance that might come from the decay of a molecular state: $(D \\bar{D^*}) (I=1) \\to J/\\psi \\rho \\to J/\\psi \\pi^+ \\pi^-$. B"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0405265","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"}