{"paper":{"title":"Evidence for a 'Narrow' Roper Resonance - the Breathing Mode of the Nucleon","license":"","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Kupsc, A. Kuznetsov, A. Povtorejko, A. Turowiecki, A. Yamamoto, B. Martemyanov, B. Morosov, B. Shwartz, C. Ekstrom, C. Pauly, D. Bogoslawsky, E. Doroshkevich, E. Jiganov, F. Cappellaro, F. Kren, G. Ivanov, G. J. Wagner, H. Calen, H. Clement, H. Pettersson, I. Koch, J. Stepaniak, J. Zabierowski, J. Zlomanczuk, K. Fransson, K. Schonning, L. Demiroers, L. Gustafsson. B. Hoistad, l M. Jacewicz, M. Bashkanov, M. Kaskulov, M. Wolke, O. Khakimova, P. Marciniewski, P. Thorngren-Engholm, R. J. M. Y. Ruber, R. Meier, S. Keleta, S. Kullander, T. Johansson, T. Skorodko, V. Sopov, V. Tikhomirov, W. Oelert, W. Scobel, Y. Petukhov","submitted_at":"2006-12-11T09:57:17Z","abstract_excerpt":"All the time since its discovery the N$^*$(1440) baryon state, commonly known as Roper resonance, has been a state with many question marks - despite of its 4-star ranking in the particle data book. One reason is that it does not produce any explicit resonance-like structures in the observables of $\\pi$N or $\\gamma$N reactions. Only in partial wave analyses of $\\pi$N scattering data a clear resonance strcuture gets obvious in the $P_{11}$ partial wave. Very recent measurements of the J/$\\Psi$ decay by the BES collaboration and of the $pp \\to np\\pi^+$ reaction at 1.3 GeV by the CELSIUS-WASA col"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-ex/0612015","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/0612015/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"}