{"paper":{"title":"Measurements of Branching Ratios for $\\eta$ Decays into Charged Particles","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Bondar, A. Erven, A. Goswami, A. Khoukaz, A. Kup\\'s\\'c, A. Kuzmin, A. Magiera, A. Pyszniak, A. Roy, A. Szczurek, A. T\\\"aschner, A. Trzci\\'nski, A. Wro\\'nska, A. Yamamoto, A. Zink, B. Kamys, B. K{\\l}os, B. Lorentz, B. Maria\\'nski, B. Shwartz, C.-O. Gullstr\\\"om, D.A. Kirillov, D. Coderre, D. Lersch, D. Prasuhn, D. Pszczel, E. Czerwi\\'nski, E. Perez del Rio, E. Stephan, F.A. Khan, F. Goldenbaum, F.S. Bergmann, G. Kemmerling, G. Khatri, G. Sterzenbach, H. Bhatt, H. Cal\\'en, H. Clement, H. Kleines, H. Ohm, H.-P. Morsch, H. Stockhorst, H. Str\\\"oher, I. Ciepa{\\l}, I. 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. Mikirtychiants, 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. Wurm, P. W\\\"ustner, P. \\.Zupra\\'nski, R. Engels, R. Maier, R. Siudak, R. Stassen, R. Varma, S. Kistryn, S. Sawant, S. Schadmand, T. Johansson, T. Sefzick, T. Skorodko, U. Wiedner, V. Hejny, V. Serdyuk, V. Sopov, W. Augustyniak, W. Bardan, W. Erven, W. Eyrich, W. Krzemie\\'n, Z. Rudy","submitted_at":"2015-09-22T13:19:26Z","abstract_excerpt":"The WASA-at-COSY experiment has collected $3\\times10^{7}$ events with $\\eta$-mesons produced via the reaction $pd\\rightarrow{^{3}\\textrm{He}}\\eta$ at $\\textrm{T} = 1.0 \\textrm{GeV}$. Using this data set, we evaluate the branching ratios of the decays $\\eta\\to\\pi^{+}\\pi^{-}\\gamma$, $\\eta\\to e^{+}e^{-}\\gamma$, $\\eta\\to\\pi^{+}\\pi^{-}e^{+}e^{-}$ and $\\eta\\to e^{+}e^{-}e^{+}e^{-}$. The branching ratios are normalized to the $\\eta\\rightarrow\\pi^{+}\\pi^{-}\\pi^{0}$ decay. In addition an upper limit on a $CP$-violating asymmetry in $\\eta\\rightarrow \\pi^{+}\\pi^{-}e^{+}e^{-}$ is extracted."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.06588","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"}