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Type: Journal article
Title: Electric dipole moment of the neutron from 2+1 flavor lattice QCD
Author: Guo, F.
Horsley, R.
Meißner, U.
Nakamura, Y.
Perlt, H.
Rakow, P.
Schierholz, G.
Schiller, A.
Zanotti, J.
Citation: Physical Review Letters, 2015; 115(6):062001-1-062001-6
Publisher: American Physical Society
Issue Date: 2015
ISSN: 0031-9007
Statement of
F.-K. Guo, R. Horsley, U.-G. Meißner, Y. Nakamura, H. Perlt, P.E.L. Rakow, G. Schierholz, A. Schiller, and J.M. Zanotti
Abstract: 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 d(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 on d(n), leads to the upper bound |θ|≲7.4×10⁻¹¹.
Rights: © 2015 American Physical Society
DOI: 10.1103/PhysRevLett.115.062001
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