{"paper":{"title":"Observation of structures in the $J/\\psi +\\psi(2S)$ mass spectrum with the ATLAS detector","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"ATLAS Collaboration","submitted_at":"2025-09-16T14:00:19Z","abstract_excerpt":"A search for resonant structures in the $J/\\psi +\\psi$(2S) mass spectrum is performed using proton--proton collision data at $\\sqrt{s}=13$ TeV, corresponding to an integrated luminosity of 140 fb$^{-1}$, recorded by the ATLAS experiment at the LHC. The decay channels of $J/\\psi +\\psi\\text{(2S)} \\rightarrow 4\\mu$ and $J/\\psi +\\psi\\text{(2S)} \\rightarrow 4\\mu+2\\pi$ are analyzed. An excess near 6.9 GeV is observed in both channels with a combined significance of 8.9$\\sigma$. No significant signal is observed near 7.2 GeV, and an upper limit on its yield relative to $X$(6900) is provided. A simult"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2509.13101","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/2509.13101/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"}