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

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 vacu...

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Bibliographic Details
Published in:Physical review letters 2015-08, Vol.115 (6), p.062001, Article 062001
Main Authors: Guo, F-K, Horsley, R, Meissner, U-G, Nakamura, Y, Perlt, H, Rakow, P E L, Schierholz, G, Schiller, A, Zanotti, J M
Format: Article
Language:English
Subjects:
Density
Dipole moment
Electric dipoles
Fermions
Flavor (particle physics)
Lattices
Mathematical analysis
Quantum chromodynamics
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Summary: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 on d(n), leads to the upper bound |θ|≲7.4×10(-11).
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.115.062001