{"paper":{"title":"QCD sum rules study of the $J^{PC}=1^{--}$ charmonium $Y$ mesons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"M. Nielsen, R.M. Albuquerque","submitted_at":"2008-04-30T13:02:01Z","abstract_excerpt":"We use QCD sum rules to test the nature of the recently observed mesons Y(4260), Y(4350) and Y(4660), assumed to be exotic four-quark $(c\\bar{c}q\\bar{q})$ or $(c\\bar{c}s\\bar{s})$ states with $J^{PC}=1^{--}$. We work at leading order in $\\alpha_s$, consider the contributions of higher dimension condensates and keep terms which are linear in the strange quark mass $m_s$. We find for the $(c\\bar{c}s\\bar{s})$ state a mass $m_Y=(4.65\\pm 0.10)$ GeV which is compatible with the experimental candidate Y(4660), while for the $(c\\bar{c}q\\bar{q})$ state we find a mass $m_Y=(4.49\\pm 0.11)$ GeV, which is h"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0804.4817","kind":"arxiv","version":1},"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"}