{"paper":{"title":"Measurement of Spin Correlation Parameters A$_{NN}$, A$_{SS}$, and A_${SL}$ at 2.1 GeV in Proton-Proton Elastic Scattering","license":"","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Meinerzhagen, C. Dahl, C. Lehmann, C. Pauly, D. Prasuhn, D. Rosendaal, E. Jonas, E. Weise, F. Bauer, F. Hinterberger, H. Krause, H. Rohdje\\ss, J. Bisplinghoff, J. Greiff, J. Lindlein, K. B\\\"u{\\ss}er, K. Ulbrich, L. Demir\\\"ors, M. Busch, N. Schirm, O. Eyser, O. Felden, P.D. Eversheim, P. von Rossen, R. Gebel, R. Gro\\ss-Hardt, R. Jahn, R. Maier, R. Ziegler, T. Colberg, T. Wolf, W. Scobel","submitted_at":"2002-09-06T17:11:05Z","abstract_excerpt":"At the Cooler Synchrotron COSY/J\\\"ulich spin correlation parameters in elastic proton-proton (pp) scattering have been measured with a 2.11 GeV polarized proton beam and a polarized hydrogen atomic beam target. We report results for A$_{NN}$, A$_{SS}$, and A_${SL}$ for c.m. scattering angles between 30$^o$ and 90$^o$. Our data on A$_{SS}$ -- the first measurement of this observable above 800 MeV -- clearly disagrees with predictions of available of pp scattering phase shift solutions while A$_{NN}$ and A_${SL}$ are reproduced reasonably well. We show that in the direct reconstruction of the sc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-ex/0209006","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/0209006/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"}