{"paper":{"title":"The $Z_c(3900)$ peak does not come from the \"triangle singularity\"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Han-Qing Zheng, Jing-Long Pang, Qin-Rong Gong, Yu-Fei Wang","submitted_at":"2016-12-24T10:02:52Z","abstract_excerpt":"We compare contributions from the triangle diagram and the $D\\bar D^*$ bubble chain to the processes of $e^{+}e^{-}\\rightarrow J/\\psi\\pi^{+}\\pi^{-}$ and $e^{+}e^{-}\\rightarrow (D\\bar D^*)^\\mp\\pi^{\\pm}$. By fitting the $J/\\psi\\pi$ maximum spectrum and the $D\\bar D^*$ spectrum, we find that the triangle diagram cannot explain the new data from BESIII Collaboration at center of mass at 4.23GeV and 4.26GeV, simultaneously. On the contrary, the molecular assignment of $Z_c(3900)$ gives a much better description."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.08159","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":""},"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"}