{"paper":{"title":"Search for Quadrupole Strength in the Electro-excitation of the Delta(1232)","license":"","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A.J. Sarty, A. Karabarbounis, A.M. Bernstein, A. Young, B.D. Milbrath, C.F. Perdrisat, C. Kunz, C. Mertz, C.N. Papanicolas, C. Tschalaer, C. Vellidis, D.H. Barkhuff, D. Tieger, G.A. Warren, G. Dodson, J. Chen, J.H. Mitchell, J.I. McIntyre, J.J. Kelly, J.M. Finn, J.R. Comfort, J. Shaw, K. Dow, K. Joo, L.B. Weinstein, M. Farkhondeh, N.I. Kaloskamis, P.E. Ulmer, R. Alarcon, R.J. Woo, R. Miskimen, R.W. Gothe, R.W. Lourie, S.-B. Soong, S. Dolfini, S. Gilad, S. Kowalski, S. Van Verst, S. Williamson, V. Burkert, W. Bertozzi, W. Turchinetz, X. Jiang","submitted_at":"1999-02-24T13:31:36Z","abstract_excerpt":"High-precision H(e,e'p)pi0 measurements at Q2=0.126 (GeV/c)2 are reported, which allow the determination of quadrupole amplitudes in the gamma* N->Delta transition; they simultaneously test the reliability of electroproduction models. The derived quadrupole-to-dipole amplitude ratios, Rsm=(-6.5 +- 0.2{stat+sys} +- 2.5{mod}) % and Rem=(-2.1 +- 0.2{stat+sys} +- 2.0{mod}) %, are dominated by model error. Previous Rsm and Rem results should be reconsidered after the model uncertainties associated with the method of their extraction are taken into account."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-ex/9902012","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/9902012/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"}