{"paper":{"title":"First exotic hadron with open heavy flavor: $cs\\bar u\\bar d$ tetraquark","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Jonathan L. Rosner, Marek Karliner","submitted_at":"2020-08-13T16:15:53Z","abstract_excerpt":"The LHCb Collaboration has reported resonant activity in the channel $D^+ K^-$, identifying two components: $X_0(2900)$ with $J^P = 0^+$ at $2866 {\\pm} 7$ MeV, $\\Gamma_0=57{\\pm} 13$ MeV and $X_1(2900)$ with $J^P = 1^-$ at $2904 {\\pm} 7$ MeV, $\\Gamma_1=110{\\pm} 12$ MeV. We interpret the $X_0(2900)$ component as a $cs \\bar u\\bar d$ isosinglet compact tetraquark, calculating its mass to be $2863 {\\pm} 12$ MeV. This is the first exotic hadron with open heavy flavor. The analogous $bs\\bar u\\bar d$ tetraquark is predicted at $6213 {\\pm} 12$ MeV. We discuss possible interpretations of the heavier and"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2008.05993","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/2008.05993/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"}