  We give a quantitative analysis of the electric dipole moments as a probe of
high scale physics. We focus on the electric dipole moment of the electron
since the limit on it is the most stringent. Further, theoretical computations
of it are free of QCD uncertainties. The analysis presented here first explores
the probe of high scales via electron EDM within MSSM where the contributions
to the electric dipole moment (EDM) arise from the chargino and the neutralino
exchanges in loops. Here it is shown that the electron EDM can probe mass
scales from tens of TeV into the PeV range.The analysis is then extended to
include a vectorlike generation which can mix with the three ordinary
generations. Here new CP phases arise and it is shown that the electron EDM now
has not only a supersymmetric contribution from the exchange of charginos and
neutralinos but also a non-supersymmetric contribution from the exchange of W
and Z bosons. It is further shown that the interference of the supersymmetric
and the non-supersymmetric contribution leads to the remarkable phenomenon
where the electron EDM as a function of the slepton mass first falls and become
vanishingly small and then rises again as the slepton mass increases This
phenomenon arises as a consequence of cancellation between the SUSY and the
non-SUSY contribution at low scales while at high scales the SUSY contribution
dies out and the EDM is controlled by the non-SUSY contribution alone. The high
mass scales that can be probed by the EDM are far in excess of what
accelerators will be able to probe. The sensitivity of the EDM to CP phases
both in the SUSY and the non-SUSY sectors are also discussed.
