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Theta-Induced Electric Dipole Moment of the Neutron via QCD Sum Rules

M. Pospelov, A. Ritz

Abstract

Using the QCD sum rule approach, we calculate the electric dipole moment of the neutron induced by a vacuum theta--angle to approximately 40-50% precision, d_n = 2.4 x 10^{-16} θe.cm. Combined with the new experimental bound, this translates into the limit |θ|< 3 x 10^{-10}.

Theta-Induced Electric Dipole Moment of the Neutron via QCD Sum Rules

Abstract

Using the QCD sum rule approach, we calculate the electric dipole moment of the neutron induced by a vacuum theta--angle to approximately 40-50% precision, d_n = 2.4 x 10^{-16} θe.cm. Combined with the new experimental bound, this translates into the limit |θ|< 3 x 10^{-10}.

Paper Structure

This paper contains 15 equations, 2 figures.

Figures (2)

  • Figure 1: Various contributions to the CP-odd structure $\{\tilde{F}\sigma,\not\!{q}\}$. (a) is the leading order contribution while (b), (c) and (d) contribute at subleading order.
  • Figure 2: The neutron EDM function $\nu(M^2($GeV$^2))$ is plotted according to the sum rules (a) and (b). The dashed line shows the contribution from the leading order term only.