{"paper":{"title":"First Model-Independent Measurement of the Spin Triplet $p\\Lambda$ Scattering Length from Final State Interaction in the $\\vec{p}p \\rightarrow pK^{+}\\Lambda$ Reaction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Gillitzer, C. Hanhart, COSY-TOF Collaboration: F. Hauenstein, D. Grzonka, E. Borodina, E. Doroshkevich, E. Roderburg, H. Clement, J. Haidenbauer, J. Ritman, K. Ehrhardt, K. Kilian, L. Kober, M. Krapp, M. Mertens, M. R\\\"oder, P. Klaja, P. Moskal, P. Wintz, P. W\\\"ustner, R. Dzhygadlo, S. Jowzaee, T. Sefzick, W. Eyrich, W. Gast, W. Schroeder","submitted_at":"2016-07-16T18:43:37Z","abstract_excerpt":"The $\\vec{p}p \\rightarrow pK^{+}\\Lambda$ reaction has been measured with the COSY-TOF detector at a beam momentum of $2.7\\,\\mathrm{GeV}/c$. The polarized proton beam enables the measurement of the beam analyzing power by the asymmetry of the produced kaon ($A_N^{K}$). This observable allows the $p\\Lambda$ spin triplet scattering length to be extracted for the first time model independently from the final-state interaction in the reaction. The obtained value is $a_{t} = (-2.55 ^{+0.72}_{-1.39} {}_{\\textrm{stat.}} \\pm 0.6_{\\textrm{syst.}} \\pm 0.3_{\\textrm{theo.}})\\mathrm{fm}$. This value is comp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1607.04783","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"}