Neutron electric dipole moment in a supersymmetric model with singlet quarks

Details Neutron electric dipole moment in a supersymmetric model with singlet quarks Neutron electric dipole moment in a supersymmetric model with singlet quarks

1995-12-18

arxiv.org/abs/hep-ph/9512332v1

Phys.Lett. B386 (1996) 167-174

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages

Scientific paper

10.1016/0370-2693(96)01140-9

The neutron electric dipole moment is investigated in a supersymmetric electroweak model admitting $ {\rm SU(2)}_W $ singlet and $ Q = -1/3 $, say $ D $-type, quarks. Significant $ CP $ violating phases appear in the coupling between the singlet $ D $-type quarks and the ordinary $ d $-type quarks. Then, through the $ d $-$ D $ mixing effects on the squark mass terms the gluino one-loop diagrams provide naturally the contributions $ \sim 10^{-26} e~{\rm cm} $ comparable to the current experimental bound on the neutron electric dipole moment. The $ CP $ violation in the $ d $-$ D $ coupling would also be relevant for the electroweak baryogenesis.

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