{"paper":{"title":"On the SigmaN cusp in the pp -> pK+Lambda reaction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"nucl-ex","authors_text":"A. Erhardt, A. Gillitzer, C. Hanhart, D. Grzonka, E. Borodina, E. Doroshkevich, E. Roderburg, F. Hauenstein, G. J. Wagner, H. Clement, H. Freiesleben, J. Ritman, K. Ehrhardt, K. Kilian, K.-Th. Brinkmann, M. Krapp, M. Roeder, M. Schulte-Wissermann, P. Klja, P. Wintz, P. Wuestner, R. Dzhygadlo, S. Abd El-Samad, T. Sfzick, W. Eyrich, W. Gast, W. Schroeder","submitted_at":"2012-06-03T09:22:38Z","abstract_excerpt":"Measurements of the $pp \\to pK^+\\Lambda$ reaction at $T_p$ = 2.28 GeV have been carried out at COSY-TOF. In addition to the $\\Lambda p$ FSI and $N^*$ resonance excitation effects a pronounced narrow structure is observed in the Dalitz plot and in its projection on the $p\\Lambda$-invariant mass. The structure appears at the $pp \\to $N$K^+\\Sigma$ threshold and is interpreted as $\\Sigma$N cusp effect. The observed width of 20 MeV/$c^2$ is substantially broader than anticipated from previous inclusive measurements. Angular distributions of this cusp structure are shown to be dissimilar to those in"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1206.0426","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":""},"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"}