Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-01-27
Nucl.Phys.Proc.Suppl. 59 (1997) 231-238
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, to appear in the Proceedings of the 4th KEK Topical Conference on 'Flavor Physics'
Scientific paper
10.1016/S0920-5632(97)00447-7
The supersymmetric standard model (SSM) has a CP-violating phase in its gauge-Higgs sector. This new source of CP violation induces the electric dipole moments (EDMs) of the neutron and electron at the one-loop level. The same CP-violating phase generates the EDM of the $W$ boson through one-loop diagrams mediated by the charginos and neutralinos, which leads to the EDMs of the neutron and electron at the two-loop level. We discuss these EDMs, assuming that the CP-violating phase has the magnitude of order 0.1--1 which may be suggested from the baryon asymmetry of the universe. Even at the two-loop level the neutron and the electron could have EDMs which are smaller than their experimental upper bounds by only one order of magnitude. Since these two-loop contributions do not depend on the values of SSM parameters for the squark or slepton sector, they provide predictions for the EDMs less ambiguous than the one-loop contributions.
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