Speaker
Prof.
Constantia Alexandrou
(University of Cyprus)
Description
We present results on the neutron electric dipole moment |𝑑⃗𝑁| using an ensemble of 𝑁𝑓=2+1+1 twisted mass clover-improved fermions with lattice spacing of 𝑎≃0.08 fm and physical pion mass (𝑚𝜋≃139 MeV). We compute the 𝐶𝑃-odd electromagnetic form factor 𝐹3(𝑄2→0) by expanding the action to leading order in 𝜃. This gives rise to correlation functions that involve the topological charge, for which we employ a fermionic definition by means of spectral projectors. We find a value of
|𝑑⃗𝑁|=0.0009(24) 𝜃 𝑒⋅fm.