{"paper":{"title":"Pentaquarks and Tetraquarks at LHCb","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["hep-ph","nucl-ex","nucl-th"],"primary_cat":"hep-ex","authors_text":"Sheldon Stone","submitted_at":"2015-09-14T12:16:53Z","abstract_excerpt":"Exotic resonant structures found in $\\Lambda^0_b$ and $\\overline{B}^0$ decays into charmonium in the LHCb experiment are discussed. Examination of the $J/\\psi p$ system in $\\Lambda^0_b\\to J/\\psi K^- p$ decays shows two states each of which must be composed of $uudc\\overline{c}$ quarks, and thus are called charmonium pentaquarks. Their masses are $4380\\pm 8\\pm 29$~MeV and $4449.8\\pm 1.7\\pm 2.5$~MeV, and their corresponding widths ($\\Gamma$) are $205\\pm 18\\pm 86$ MeV, and $39\\pm 5\\pm 19$ MeV. The preferred $J^P$ assignments are of opposite parity, with one state having spin 3/2 and the other 5/2"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.04051","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"}