Neutron electric dipole moment in the standard model: Complete three-loop calculation of the valence quark contributions

Abstract

We present a complete three-loop calculation of the electric dipole moment of the u and d quarks in the standard model. For the d quark, more relevant for the experimentally important neutron electric dipole moment, we find cancellations which lead to an order of magnitude suppression compared with previous estimates. © 1997 American Physical Society.