SUSY CP Problem in Gauge Mediation Model

TL;DR

This paper reevaluates the SUSY CP problem in gauge mediation models, highlighting two previously underexplored sources of CP violation that can lead to electric dipole moments exceeding experimental limits.

Contribution

It identifies and analyzes two new sources of CP violation in gauge mediation models, emphasizing their impact on electric dipole moments and experimental constraints.

Findings

GUT relation breaking effects can induce large EDMs.

Supergravity effects significantly contribute to CP violation.

Both sources can violate experimental bounds on EDMs.

Abstract

SUSY CP problem in the gauge mediation supersymmetry breaking model is reconsidered. We pay particular attention to two sources of CP violating phases whose effects were not seriously studied before; one is the effect of the breaking of the GUT relation among the gaugino masses due to the field esponsible for the GUT symmetry breaking, and the other is the supergravity effect on the supersymmetry breaking parameters, in particular, on the bi-linear supersymmetry breaking Higgs mass term. We show that both of them can induce too large electric dipole moments of electron, neutron, and so on, to be consistent with the experimental bounds.