{"paper":{"title":"Poles and Poltergeists in $e^+ e^- \\to D \\bar D$ Data","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Chang-Zheng Yuan, Eric S. Swanson, Nils H\\\"usken, Richard F. Lebed, Ryan E. Mitchell, Ya-Qian Wang","submitted_at":"2024-04-05T05:21:50Z","abstract_excerpt":"A recent report of $e^+ e^- \\to D\\bar D$ events by the BESIII Collaboration suggests the presence of a structure $R$ at 3900~MeV\\@. We argue that this structure, called $G(3900)$ in the past, is not in fact due to a new $c\\bar c$ resonance, but rather naturally emerges as a threshold enhancement due to the opening of the $D^*\\bar D$ channel. We further find that the appearance of this structure does not require suppression because of a radial node in the $\\psi(4040)$ wave function, although a node improves fit quality. The measured $e^+ e^-$ coupling of $\\psi(4040)$ is found to be substantiall"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2404.03896","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2404.03896/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"}