{"paper":{"title":"Observation of a narrow baryon resonance with positive strangeness formed in $K^+$Xe collisions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"nucl-ex","authors_text":"A.E. Asratyan, A.G. Dolgolenko, C. Curceanu, C. Guaraldo, DIANA Collaboration: V.V. Barmin, G.K. Tumanov, G.V. Davidenko, I.F. Larin, L.I. Sokolov, M.A. Kubantsev, N.N. Shishov, V.A. Matveev, V.A. Shebanov, V.S. Borisov, V.S. Verebryusov, V.V. Tarasov","submitted_at":"2013-07-05T16:17:27Z","abstract_excerpt":"The charge-exchange reaction K^+ Xe --> K^0 p Xe' is investigated using the data of the DIANA experiment. The distribution of the pK^0 effective mass shows a prominent enhancement near 1538 MeV formed by \\sim 80 events above the background, whose width is consistent with being entirely due to the experimental resolution. Under the selections based on a simulation of K^+Xe collisions, the statistical significance of the signal reaches 5.5\\sigma. We interpret this observation as strong evidence for formation of a pentaquark baryon with positive strangeness, \\Theta^+(uudd\\bar{s}), in the charge-e"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.1653","kind":"arxiv","version":3},"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"}