{"paper":{"title":"Proton-$\\eta^\\prime$ interactions at threshold","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. V. Anisovich, A. V. Sarantsev, B. G. Ritchie, E. Klempt, M. Dugger, U. Thoma, V. A. Nikonov, V. Burkert","submitted_at":"2018-03-19T06:42:43Z","abstract_excerpt":"Recent data on photoproduction of $\\eta'$ mesons off protons have been included in the data base for the Bonn-Gatchina partial wave analysis. The real and imaginary parts of the $S$-wave $\\eta^\\prime p\\to \\eta^\\prime p$ scattering amplitude in the threshold region were fit to yield the $\\eta^\\prime p$ scattering length and the interaction range. This new analysis found $|a_{\\eta^\\prime p}|= (0.403\\pm 0.015\\pm 0.060)$ fm and a phase $\\phi=(87\\pm2)^\\circ$, while the range parameter is not well-constrained. The striking behavior of the GRAAL data on the beam asymmetry in the threshold region sugg"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.06814","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"}