{"paper":{"title":"Evidence for narrow resonant structures at $W \\approx 1.68$ and $W \\approx 1.72$ GeV in real Compton scattering off the proton","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","hep-ph"],"primary_cat":"nucl-ex","authors_text":"C.Sutera, F.Ghio, F.Mammoliti, G.Gervino, G.Giardina, G.Mandaglio, M.L.Sperduto, V.Bellini, V.Kuznetsov, W.Kim","submitted_at":"2015-01-18T18:29:11Z","abstract_excerpt":"First measurement of the beam asymmetry $\\Sigma$ for Compton scattering off the proton in the energy range $E_{\\gamma}=0.85 - 1.25$ GeV is presented. The data reveals two narrow structures at $E_{\\gamma}= 1.036$ and $E_{\\gamma}=1.119$ GeV. They may signal narrow resonances with masses near $1.68$ and $1.72$ GeV, or they may be generated by the sub-threshold $K\\Lambda$ and $\\omega p$ production. Their decisive identification requires additional theoretical and experimental efforts."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.04333","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":""},"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"}