Enhanced contribution to quark and neutron electric dipole moments with small mixing of right-handed currents and CKM CP violation

TL;DR

This paper investigates how small right-handed current mixing and CKM CP violation can significantly enhance the predicted electric dipole moments of quarks and neutrons beyond standard model expectations, at two-loop order.

Contribution

It introduces a model with small right-handed current mixing affecting EDM predictions, extending previous analyses of CP violation effects.

Findings

EDMs are generated at two-loop order with small right-handed mixing.

Predicted EDMs are substantially larger than standard model estimates.

The results highlight the importance of right-handed currents in CP violation studies.

Abstract

We study the light quark and the neutron electric dipole moments (EDMs) under the assumptions that the CP source is still in the usual CKM matrix and that there is a small mixing of right-handed charged currents in the quark sector. We find that the EDMs arise already at two loop order that are much larger than the standard model (SM) result even for a small mixing.