Electron and Neutron Electric Dipole Moments in the Constrained MSSM

TL;DR

This paper investigates how CP-violating phases in the constrained MSSM influence electron and neutron EDMs, highlighting the importance of phase correlations and model dependence in predicting experimental bounds.

Contribution

It provides a detailed analysis of CP phases' effects on EDMs within the constrained MSSM, emphasizing phase correlations and model sensitivities.

Findings

Strong correlation between phases phi_mu and phi_A0 for small SUSY masses

Neutron EDM predictions vary significantly between models

Parameter regions excluded by current EDM experimental bounds

Abstract

We analyze the effects of CP-violating phases on the electric dipole moment (EDM) of electron and neutron in the constrained minimal supersymmetric model. We find that the phases phi_{\mu} and phi_{A_0} have to be strongly correlated, in particular for small values of the SUSY mass parameters. We calculate the neutron EDM in two different models, the Quark-Parton Model and the Chiral Quark Model. It turns out that the predictions are quite sensitive to the model used. We show parameter regions in the M_0-M_1/2 plane which are excluded by considering simultaneously the experimental bounds of both electron and neutron EDM, assuming specific values for the phases phi_{\mu} and phi_{A_0}.