{"paper":{"title":"$\\eta^{\\prime}$ production in proton-proton scattering close to threshold}","license":"","headline":"","cross_cats":["nucl-th"],"primary_cat":"nucl-ex","authors_text":"A. Budzanowski, A. Khoukaz, A. Kozela, A. Strza{\\l}kowski, C. Goodman, C. Hanhart, C. Quentmeier, C. Thomas, D. Grzonka, D. Wyrwa, G. Schepers, H. Dombrowski, J. Haidenbauer, J. Smyrski, J. T. Balewski, K. Kilian, L. Jarczyk, M. Jochmann, M. K\\\"ohler, M. Soko{\\l}owski, M. Wolke, N. Nikolaev, P. Moskal, P. W\\\"ustner, R. Santo, T. Lister, T. Sefzick, U.-G. Mei{\\ss}ner, U. Seddik, W. Oelert","submitted_at":"1998-03-04T17:48:01Z","abstract_excerpt":"The $pp \\to pp \\eta^{\\prime}$ (958) reaction has been measured at COSY using the internal beam and the COSY-11 facility. The total cross sections at the four different excess energies \\mbox{$ Q = ~1.5 ~MeV, ~1.7 ~MeV, ~2.9 ~MeV,$ and $ ~4.1 MeV$} have been evaluated to be \\mbox{$ \\sigma = 2.5 \\pm 0.5~nb$, $~~~ 2.9 \\pm 1.1~nb$, $~~~ 12.7 \\pm 3.2~nb$, ~ and $~~~ 25.2 \\pm 3.6 ~nb $}, respectively. In this region of excess energy the $\\eta^{\\prime}$ (958) cross sections are much lower compared to those of the $\\pi ^0$ and $\\eta$ production."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-ex/9803002","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/nucl-ex/9803002/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"}