{"paper":{"title":"Search for the radiative decay $\\eta \\to \\pi^0 \\gamma \\gamma$ in the SND experiment at VEPP-2M","license":"","headline":"","cross_cats":["hep-ph"],"primary_cat":"hep-ex","authors_text":"A.A. Drozdetsky, A.A. Korol, A.A. Salnikov, A.A. Valishev, A.G. Bogdanchikov, A.G. Skripkin, A.V. Berdyugin, A.V. Bozhenok, A.V. Otboev, A.V. Vasiljev, D.A. Bukin, D.I. Ganyushin, E.V. Pakhtusova, I.A. Koop, K.I. Beloborodov, M.N. Achasov, S.I. Serednyakov, S.V. Burdin, S.V. Koshuba, T.V. Dimova, V.A. Sidorov, V.B. Golubev, V.N. Ivanchenko, V.P. Druzhinin, V.V. Shary, Yu.M. Shatunov, Yu.S. Velikzhanin, Z.K. Silagadze","submitted_at":"2001-01-25T08:22:09Z","abstract_excerpt":"The $\\eta \\to \\pi^0 \\gamma \\gamma$ decay was investigated by the SND detector at VEPP-2M $e^+e^-$ collider in the reaction $e^+e^-\\to\\phi\\to \\eta\\gamma$. Here we present the results and some details of this study. We report an upper limit (90% c.l.) $Br(\\eta \\to \\pi^0 \\gamma \\gamma)<8.4\\times 10^{-4}$ as our final result. Our upper limit does not contradict the earlier measurement by GAMS spectrometer. To facilitate future studies a rather detailed review of the problem is also given."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/0101043","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/hep-ex/0101043/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"}