{"paper":{"title":"Heavy Quarkonium \\pi^+\\pi^- Transitions and a Possible b\\bar{b}q\\bar{q} State","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"F.-K. Guo, H.-C. Chiang, P.-N. Shen, R.-G. Ping","submitted_at":"2004-10-14T13:08:16Z","abstract_excerpt":"$\\pi^+\\pi^-$ transitions of heavy quarkonia, especially the $ \\Upsilon(3S)\\to\\Upsilon(1S)\\pi^+\\pi^-$ decay process, are revisited. In the framework of the Chiral Unitary Theory (ChUT), the $S$ wave $\\pi\\pi$ final state interaction (FSI) is included. It is found that when an additional intermediate state with $J^P=1^+$ and I=1 is introduced, not only the $ \\pi\\pi$ invariant mass spectrum and the $cos\\theta_\\pi^*$ distribution in the $\\Upsilon(3S)\\to\\Upsilon(1S)\\pi^+\\pi^-$ process can simultaneously be well-explained, but also a consistent description for other bottomonia $ \\pi^+\\pi^-$ transitio"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0410204","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/hep-ph/0410204/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}