Neutron and proton electric dipole moments from Nf=2+1 domain-wall fermion lattice QCD
Abstract
We present a lattice calculation of the neutron and proton electric dipole moments (EDM's) with Nf=2+1 flavors of domain-wall fermions. The neutron and proton EDM form factors are extracted from three-point functions at the next-to-leading order in the θ vacuum of QCD. In this computation, we use pion masses 0.33 and 0.42 GeV and 2.7 fm3 lattices with Iwasaki gauge action and a 0.17 GeV pion and 4.6 fm3 lattice with I-DSDR gauge action, all generated by the RBC and UKQCD collaborations. The all-mode-averaging technique enables an efficient and high statistics calculation. Chiral behavior of lattice EDM's is discussed in the context of baryon chiral perturbation theory. In addition, we also show numerical evidence on relationship of three- and two-point correlation function with local topological distribution.
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