title: 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 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).
authors: Helmholtz Institut für Strahlen-und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, 53115 Bonn, Germany.
authors: F-K
authors: FK
authors: Guo
authors: School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom.
authors: R
authors: R
authors: Horsley
authors: Helmholtz Institut für Strahlen-und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, 53115 Bonn, Germany.|Institute for Advanced Simulation, Institut für Kernphysik and Jülich Center for Hadron Physics, JARA-FAME and JARA-HPC, Forschungszentrum Jülich, 52425 Jülich, Germany.
authors: U-G
authors: UG
authors: Meissner
authors: RIKEN Advanced Institute for Computational Science, Kobe, Hyogo 650-0047, Japan.
authors: Y
authors: Y
authors: Nakamura
authors: Institut für Theoretische Physik, Universität Leipzig, 04103 Leipzig, Germany.
authors: H
authors: H
authors: Perlt
authors: Theoretical Physics Division, Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, United Kingdom.
authors: P E L
authors: PE
authors: Rakow
authors: Deutsches Elektronen-Synchrotron DESY, 22603 Hamburg, Germany.
authors: G
authors: G
authors: Schierholz
authors: Institut für Theoretische Physik, Universität Leipzig, 04103 Leipzig, Germany.
authors: A
authors: A
authors: Schiller
authors: CSSM, Department of Physics, University of Adelaide, Adelaide SA 5005, Australia.
authors: J M
authors: JM
authors: Zanotti