The electric dipole moment of the neutron from 2+1 flavor lattice QCD

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 theta term. The latter is rotated into the pseudoscalar density in the fermionic action using the axial anomaly. To make the action real, the vacuum angle theta is taken to be purely imaginary. The physical value of d_n is obtained by analytic continuation. We find d_n = -3.8(2)(9) x 10^{-16} [theta e cm], which, when combined with the experimental limit on d_n, leads to the upper bound theta < 7.6 x 10^{-11}.

12 pages, 8 figures, matches PRL published version

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• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• Fundamental Physics at the Intensity Frontier
• Non-perturbative improvement of stout-smeared three flavour clover fermions
• Baryon electric dipole moments from strong CP violation
• Topological susceptibility and the sampling of field space in $N_f=2$ lattice QCD simulations
• Full QCD calculation of neutron electric dipole moment with the external electric field method
• A Feynman-Hellmann approach to the spin structure of hadrons
• Renormalization of local quark-bilinear operators for Nf=3 flavors of SLiNC fermions
• Reply to Comment on ``An Improved Experimental Limit on the Electric Dipole Moment of the Neutron''
• A novel approach to nonperturbative renormalization of singlet and nonsinglet lattice operators
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• The Neutron EDM Experiment

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