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

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arxiv 1502.02295 v2 pith:HGU7IOF2 submitted 2015-02-08 hep-lat hep-phnucl-th

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

F.-K. Guo , R. Horsley , U.-G. Meissner , Y. Nakamura , H. Perlt , P. E. L. Rakow , G. Schierholz , A. Schiller
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J. M. Zanotti
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classification hep-lat hep-phnucl-th
keywords thetaactiondipoleelectriclatticemomentneutronanalytic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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}.

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  1. The Neutron Electric Dipole Moment from Lattice QCD using a Background Electric Field

    hep-lat 2026-07 conditional novelty 7.0

    Using background electric fields, local topological charge, and non-Hermitian GEVP, lattice QCD yields dn = -0.0050(4)stat(8)sys θ-bar e fm at the physical point.