Abstract
In the Kobayashi-Maskawa model, penguin diagrams can induce CP violating phases in matrix elements of the type n→ Λ. This produce a neutron electric dipole moment through subsequent parity violating radiative weak decay Λ→n γ. We can expect ( D n e )≅10 −30 cm , three to four orders of magnitude bigger than the mechanism based on the transition quark electric dipole moment. The reason is essentially that the GIM cancellation comes in the Penguin case from ( α s π ) log m 2 t m 2 c abd not from π −2 (m 2 t −m 2 c ) M 2 W as for the transition quark electric dipole moment.
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