TL;DR
This paper reviews models of spontaneous CP violation, focusing on the Nelson-Barr approach, analyzing their scale coincidences, and examining their compatibility with experimental constraints like neutron EDM and collider bounds.
Contribution
It provides a detailed review of the Nelson-Barr models, highlighting the scale coincidence issue and analyzing their experimental viability.
Findings
Nelson-Barr models require a specific coincidence of mass scales.
Radiative corrections impact neutron electric dipole moment predictions.
Compatibility with collider and flavor bounds is critically assessed.
Abstract
Models of spontaneous CP violation can solve the Strong CP problem without the need of an anomalous Peccei-Quinn symmetry. In this work we review the Nelson-Barr approach, quantifying a peculiar coincidence between unrelated mass scales that these models must satisfy in order to correctly reproduce the Standard Model quark masses and CP violation. We investigate the compatibility between this requirement and the induced radiative corrections to the neutron electric dipole moment, and with bounds coming from collider, electroweak and flavor observables.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Dark Matter and Cosmic Phenomena · Neutrino Physics Research