{"paper":{"title":"Anomalous dipion invariant mass distribution of the $\\Upsilon(4S)$ decays into $\\Upsilon(1S) \\pi^{+} \\pi^{-}$ and $\\Upsilon(2S) \\pi^{+} \\pi^{-}$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","nucl-ex","nucl-th"],"primary_cat":"hep-ph","authors_text":"Dian-Yong Chen, Xiang Liu, Xue-Qian Li","submitted_at":"2011-09-07T09:59:01Z","abstract_excerpt":"To solve the discrepancy between the experimental data on the partial widths and lineshapes of the dipion emission of $\\Upsilon(4S)$ and the theoretical predictions, we suggest that there is an additional contribution which was not taken into account in previous calculations. Noticing that the mass of $\\Upsilon(4S)$ is above the production threshold of $B\\bar B$, the contribution of the sequential process $\\Upsilon(4S)\\to B\\bar B\\to \\Upsilon(nS)+S\\to \\Upsilon(nS)+\\pi^+\\pi^-$ ($n=1,2$) may be sizable, and its interference with that from the direct production would be important. The goal of this"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.1406","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"}