The top quark electric dipole moment in an MSSM extension with vector like multiplets

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The electric dipole moment (EDM) of the top quark is calculated in a model with a vector like multiplet which mixes with the third generation in an extension of the MSSM. Such mixings allow for new CP violating phases. Including these new CP phases, the EDM of the top in this class of models is computed. The top EDM arises from loops involving the exchange of the W, the Z as well as from the exchange involving the charginos, the neutralinos, the gluino, and the vector like multiplet and their superpartners. The analysis of the EDM of the top is more complicated than for the light quarks because the mass of the external fermion, in this case the top quark mass cannot be ignored relative to the masses inside the loops. A numerical analysis is presented and it is shown that the top EDM could be close to 10⁻¹⁹ ecm consistent with the current limits on the EDM of the electron, the neutron and on atomic EDMs. A top EDM of size 10⁻¹⁹ecm could be accessible in collider experiments such as the ILC.