Rare CP-violated η and η′ meson decays and neutron EDM. Alexey S. Zhevlakov, Mikhail Gorchtein, Astrid N. Hiller Blin and Valery E. Lyubovitskij EPJ Web Conf., 191 (2018) 02003 Published online: 31 October 2018 DOI: 10.1051/epjconf/201819102003