{"paper":{"title":"Quasifree photoproduction of $\\eta$ mesons off protons and neutrons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","nucl-th"],"primary_cat":"nucl-ex","authors_text":"A2 Collaboration at MAMI: D. Werthm\\\"uller, A. Braghieri, A. Fix, A. K\\\"aser, A. Kulbardis, A. Mushkarenkov, A. Nikolaev, A. Polonski, A. Starostin, A. Thomas, B. Demissie, B. Krusche, B.M.K. Nefkens, B. Oussena, D. Branford, D.G. Middleton, D. Hamilton, D. Hornidge, D. Howdle, D.I. Glazier, D.M. Manley, D.P. Watts, D. Sober, E.F. McNicoll, E. Heid, E.J. Downie, F. Pheron, G.M. Huber, G. Rosner, H.J. Arends, I. Jaegle, I.J.D. MacGregor, I. Keshelashvili, I. Supek, J. Ahrens, J. Brudvik, J.C. McGeorge, J. Mancell, J.R.M. Annand, J. Robinson, K. Bantawa, K. Livingston, L.V. Fil'kov, L. Witthauer, M. Dieterle, M.H. Sikora, M. Korolija, M. Martinez, M. Oberle, M. Ostrick, M. Thiel, M. Unverzagt, O. Jahn, P. Aguar-Bartolom\\'e, P.B. Otte, P. Drexler, P. Pedroni, R. Beck, R. Kondratiev, R. Novotny, S. Cherepnya, S. Costanza, S.N. Prakhov, S.P. Kruglov, S. Schumann, T.C. Jude, T. Rostomyan, V. Bekrenev, V. Lisin, V.L. Kashevarov, V. Metag, W.J. Briscoe, Y. Maghrbi, Z. Marinides","submitted_at":"2014-07-25T17:11:55Z","abstract_excerpt":"Differential and total cross sections for the quasifree reactions $\\gamma p\\rightarrow\\eta p$ and $\\gamma n\\rightarrow\\eta n$ have been determined at the MAMI-C electron accelerator using a liquid deuterium target. Photons were produced via bremsstrahlung from the 1.5 GeV incident electron beam and energy-tagged with the Glasgow photon tagger. Decay photons of the neutral decay modes $\\eta\\rightarrow 2\\gamma$ and $\\eta\\rightarrow 3\\pi^0 \\rightarrow 6\\gamma$ and coincident recoil nucleons were detected in a combined setup of the Crystal Ball and the TAPS calorimeters. The $\\eta$-production cros"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.6974","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"}