A Resolution to the Supersymmetric CP Problem with Large Soft Phases via D-branes

TL;DR

This paper explores how certain string theory models with D-branes can naturally accommodate large CP-violating phases in supersymmetry without conflicting with electric dipole moment constraints, linking low energy data to Planck scale physics.

Contribution

It identifies specific D-brane embeddings that allow large soft phases while satisfying experimental constraints, advancing understanding of supersymmetry breaking in string models.

Findings

Some embeddings satisfy EDM constraints with large phases

String models motivate large soft phases

Low energy data can inform Planck scale physics

Abstract

We examine the soft supersymmetry breaking parameters that result from various ways of embedding the Standard Model (SM) on D-branes within the Type I string picture, allowing the gaugino masses and $\mu$ to have large CP- violating phases. One embedding naturally provides the relations among soft parameters to satisfy the electron and neutron electric dipole moment constraints even with large phases, while with other embeddings large phases are not allowed. The string models provide some motivation for large phases in the soft breaking parameters. The results generally suggest how low energy data might teach us about Planck scale physics.