{"paper":{"title":"Angular distribution in s-channel formation of the pentaquark $\\Theta^+$ baryon","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex"],"primary_cat":"hep-ex","authors_text":"A.E. Asratyan, C. Curceanu, C. Guaraldo, DIANA Collaboration: V.V. Barmin, G.V. Davidenko, I.F. Larin, L.I. Sokolov, M.A. Kubantsev, N.N. Shishov, V.A. Matveev, V.A. Shebanov, V.V. Tarasov","submitted_at":"2015-07-21T21:51:31Z","abstract_excerpt":"Using the DIANA data on the charge-exchange reaction $K^+n \\rightarrow pK^0$ on a bound neutron, in which the s-channel formation of the pentaquark baryon $\\Theta^+(1538)$ has been observed, we analyze the dependence of the background-subtracted $\\Theta^+ \\rightarrow pK^0$ signal on the $K^0$ emission angle in the $pK^0$ rest frame. In order to describe the observed $\\cos\\Theta_K^\\mathrm{cms}$ distribution, invoking the interference between the nonresonant s-wave and the $\\Theta^+$-mediated higher-wave contributions to the amplitude of the charge-exchange reaction is required at a 2.8$\\sigma$ "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.06001","kind":"arxiv","version":5},"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"}