Electric Dipole Moment of the Neutron from 2+1 Flavor Lattice QCD.

@article{Guo2015ElectricDM,
  title={Electric Dipole Moment of the Neutron from 2+1 Flavor Lattice QCD.},
  author={Feng-Kun Guo and R. Horsley and Ulf-G. Mei{\ss}ner and Y. Nakamura and Holger Perlt and Paul E. L. Rakow and G. Schierholz and Arwed Schiller and James Zanotti},
  journal={Physical review letters},
  year={2015},
  volume={115 6},
  pages={
          062001
        }
}
We compute the electric dipole moment d(n) of the neutron from a fully dynamical simulation of lattice QCD with 2+1 flavors of clover fermions and nonvanishing θ term. The latter is rotated into a pseudoscalar density in the fermionic action using the axial anomaly. To make the action real, the vacuum angle θ is taken to be purely imaginary. The physical value of dd(n) is obtained by analytic continuation. We find d(n)=-3.9(2)(9)×10(-16) θ  e cm, which, when combined with the experimental limit… 

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