Abstract
It is shown that quark electric dipole moments contributing to the neutron moment, in the standard six-quark SU(2) × U(1) model of weak and electromagnetic interactions, cannot be large enough to be observable in present or projected experiments. For M Top ≲ 1 4 M W , an optimistic upper limit is 10 −31 e · cm; a realistic maximum is 10 −34 e · cm. These limits are comparable to the leading standard model diquark contribution to the neutron moment, and extremely small compared to scalar-exchange CP-violation model estimates (which are comparable to present experimental limits).
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