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ISSN - 05562813, EISSN - 1089490X, Physical Review C - Nuclear Physics, 2016, vol. 94, 6, p. -

Measurements of branching ratios for η decays into charged particles

Adlarson P., Augustyniak W., Bardan W., Bashkanov M., Bergmann F. S., Berłowski M., Bhatt H., Bondar A., Büscher M., Calén H., Ciepał I., Clement H., Coderre D., Czerwiński E., Demmich K., Engels R., Erven A., Erven W., Eyrich W., Fedorets P., Föhl K., Fransson K., Goldenbaum F., Goswami A., Grigoryev K., Gullström C. O., Heijkenskjöld L., Hejny V., Hüsken N., Jarczyk L., Johansson T., Kamys B., Kemmerling G., Khan F. A., Khatri G., Khoukaz A., Kirillov D. A., Kistryn S., Kleines H., Kłos B., Krzemień W., Kulessa P., Kupść A., Kuzmin A., Lalwani K., Lersch D., Lorentz B., Magiera A., Maier R., Marciniewski P., Mariański B., Mikirtychiants M., Morsch H. P., Moskal P., Ohm H., Ozerianska I., Perez Del Rio E., Piskunov N. M., Prasuhn D., Pszczel D., Pysz K., Pyszniak A., Ritman J., Roy A., Rudy Z., Rundel O., Sawant S., Schadmand S., Sefzick T., Serdyuk V., Shwartz B., Sitterberg K.

© 2016 American Physical Society. The WASA-at-COSY experiment has collected 3×107 events with η mesons produced via the reaction pd→He3η at T=1.0GeV. Using this data set, we evaluate the branching ratios of the decays η→π+π-γ, η→e+e-γ, η→π+π-e+e-, and η→e+e-e+e-. The branching ratios are normalized to the η→π+π-π0 decay. In addition an upper limit on a CP-violating asymmetry in η→π+π-e+e- is extracted.