Non-unitarity of CKM matrix from the vector singlet quark mixing and neutron electric dipole moment

Abstract

In the standard model (SM) the lowest order contribution to the quark electric dipole moment (EDM) occurs at the three loop level. We show that the non-unitarity of the CKM matrix in models with an extended quark sector typically gives rise to a quark EDM at the two loop level which has no GIM-like suppression factors except the external quark mass. The induced neutron EDM is of order 10^{-29} e cm and can be well within the reach of the next generation of experiments if it is further enhanced by long distance physics as happens in the SM.

Some typos are corrected. References are updated. Discussion on FCNC contributions is added

References in corpus (4)

• Weak-Singlet Fermions: Models and Constraints
• Quark mixings and flavor changing interactions with singlet quarks
• Constraining Extensions of the Quark Sector with the CP Asymmetry in $B\to \psi K_S$
• Enhanced contribution to quark and neutron electric dipole moments with small mixing of right-handed currents and CKM CP violation

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• Electroweak Baryogenesis in a Scalar-Assisted Vector-Like Fermion Model
• A clean signal for a top-like isosinglet fermion at the Large Hadron Collider
• Electric Dipole Moments of Charged Leptons from Their Majorana-type Yukawa Couplings