{"paper":{"title":"Measurement of the beam-helicity asymmetry in the p(e_pol,e'p)pi_0 reaction at the energy of the Delta(1232) resonance","license":"","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Liesenfeld, A. Suele, A. Wagner, D. Baumann, D. Bosnar, D. Drechsel, D. Elsner, F. Klein, G. Rosner, H. Merkel, H. Schmieden, I. Ewald, J. Bermuth, J. Friedrich, J.M. Friedrich, K. Bohinc, K.W. Krygier, L. Tiator, M. Ding, M. Distler, M. Kahrau, M. Potokar, M. Seimetz, M. Weis, P. Bartsch, P. Jennewein, P. Merle, R. Boehm, R. Neuhausen, S. Groezinger, S. Hedicke, S.S. Kamalov, Th. Pospischil, Th. Walcher, U. Mueller","submitted_at":"2001-12-18T23:15:51Z","abstract_excerpt":"In a p(e_pol,e'p)pi_0 out-of-plane coincidence experiment at the 3-spectrometer setup of the Mainz Microtron MAMI, the beam-helicity asymmetry has been precisely measured around the energy of the Delta(1232) resonance and Q^2 = 0.2 (GeV/c)^2. The results are in disagreement with three up-to-date model calculations. This is interpreted as lack of understanding of the non-resonant background, which in dynamical models is related to the pion cloud."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-ex/0112009","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/nucl-ex/0112009/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"}