ISSN - 05562813, EISSN - 1089490X, Physical Review C - Nuclear Physics, 2016, vol. 94, 6, p. -
Measurements of branching ratios for η decays into charged particles
© 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.