{"paper":{"title":"Search for $C$ violation in the decay $\\eta\\rightarrow\\pi^0+e^++e^-$ with WASA-at-COSY","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. Bondar, A. Erven, A. Goswami, A. Khoukaz, A. Khreptak, A. Kup\\'s\\'c, A. Kuzmin, A. Magiera, A. Pyszniak, A. Roy, A. Szczurek, A. Trzci\\'nski, A. Wirzba, A. Wro\\'nska, A. Yamamoto, B. Kamys, B. K{\\l}os, B. Lorentz, B. Maria\\'nski, B. Shwartz, C. Hanhart, C.-O. Gullstr\\\"om, D.A. Kirillov, D. Lersch, D. Prasuhn, D. Pszczel, E. Czerwi\\'nski, E. Perez del Rio, E. Stephan, F. Goldenbaum, F.S. Bergmann, G. Kemmerling, G. Khatri, G. Sterzenbach, H. Cal\\'en, H. Clement, H. Kleines, H. Ohm, H.-P. Morsch, H. Stockhorst, H. Str\\\"oher, I. Ciepa{\\l}, I. Sch\\\"atti-Ozerianska, J. Ritman, J. Smyrski, J. Stepaniak, J. Zabierowski, J. Z{\\l}oma\\'nczuk, K. Demmich, K. F\\\"ohl, K. Fransson, K. Grigoryev, K. Lalwani, K. Pysz, K. Sitterberg, L. Heijkenskj\\\"old, L. Jarczyk, M. Bashkanov, M. Ber{\\l}owski, M. B\\\"uscher, M.J. Zieli\\'nski, M. Skurzok, M. Wolke, M. \\.Zurek, N. H\\\"usken, N.M. Piskunov, O. Rundel, P. Adlarson, P. Fedorets, P. Kulessa, P. Marciniewski, P. Moskal, P. W\\\"ustner, P. \\.Zupra\\'nski, R. Engels, R. Maier, R. Stassen, S. Kistryn, S. Sawant, S. Schadmand, T. Johansson, T. Sefzick, T. Skorodko, V. Hejny, V. Serdyuk, V. Sopov, W. Augustyniak, W. Bardan, W. Erven, W. Eyrich, W. Krzemie\\'n, W. Parol, Z. Rudy","submitted_at":"2018-02-23T17:06:11Z","abstract_excerpt":"We report on the investigation of the rare decay $\\eta\\rightarrow\\pi^0+\\text{e}^++\\text{e}^-$ which is of interest to study both $C$ violation in the electromagnetic interaction and to search for contributions from physics beyond the Standard Model, since the allowed decay via a two-photon intermediate state is strongly suppressed. The experiment has been performed using the WASA-at-COSY installation, located at the COSY accelerator of the Forschungszentrum J\\\"ulich, Germany. In total $3\\times10^7$ events of the reaction $\\text{p}+\\text{d}\\rightarrow{^3\\text{He}}+\\eta$ have been recorded at an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.08642","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"}