{"paper":{"title":"Measurement of the \\Sigma\\ beam asymmetry for the \\omega\\ photo-production off the proton and the neutron at GRAAL","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A.D'Angelo, A.Fantini, A.Giusa, A.Lapik, A.Lleres, A.Mushkarenkov, A.Turinge, B.Girolami, C.Randieri, C.Schaerf, D.Franco, D.Moricciani, D.Rebreyend, F.Curciarello, F.Ghio, F.Mammoliti, G.Gervino, G.Giardina, G.Mandaglio, G.Russo, I.Zonta, J.P.Boquet, J.P.Didelez, L.E.Casano, M.Capogni, M.Castoldi, M.C.Sutera, M.L.Sperduto, M.Manganaro, N.Rudnev, O.Bartalini, P.Levi Sandri, R.Di Salvo, V.Bellini, V.De Leo, V.Nedorezov, V.Vegna","submitted_at":"2013-06-25T12:45:08Z","abstract_excerpt":"We report on new measurements of the beam asymmetry for \\omega\\ photo-production on proton and neutron in Hydrogen and Deuterium targets from the GRAAL collaboration. The beam asymmetry values are extracted from the reaction threshold (E_{\\gamma} = 1.1 GeV in the free nucleon kinematics) up to 1.5 GeV of incoming photon energy. For the first time both the radiative and the three-pion decay channels are simultaneously investigated on the free proton. Results from the two decay channels are in agreement and provide important constraints for the determination of resonant state contributions to th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1306.5943","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":""},"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"}