Updated limits on the CP violating $\eta \pi \pi$ and ${\eta }^{\prime }\pi \pi$ couplings derived from the neutron EDM

Alexey S. Zhevlakov, Thomas Gutsche, Valery E. Lyubovitskij

We complete our derivation of upper limits on the CP violating $\eta \pi \pi$ and ${\eta }^{\prime }\pi \pi$ couplings from an analysis of their two-loop contributions to the neutron electric dipole moment (nE…